BM6343FS-Z (开发中)

Datasheet

36 V High-performance, High-Reliability

Unipolar Stepping Motor Driver

BM6343FS-Z

General Description

Key Specifications

◼ Rated Input Voltage:

◼ Rated Output Voltage:

BM6343FS-Z is a unipolar stepping motor driver. Rated

power supply voltage of the device is 36 V, rated output

voltage is 100 V, and rated output current is 3.0 A.

CLK-IN Driving Mode and 3-wire Serial Communication

Mode is adopted for input interface, and excitation mode

is corresponding to FULL STEP mode, HALF STEP mode

and QUARTER STEP mode via a built-in DAC. In addition,

the power supply may be driven by one single system,

which simplifies the design.

36 V

100 V

◼ Rated Output Current (Continuous): 3.0 A/ phase

◼ Rated Output Current (Peak Value): 3.5 A/ phase

◼ Operating Temperature Range: -25 °C to +85 °C

◼ Output ON Resistance:

0.1 Ω (Typ)

Package

SSOP-A54_36

W (Typ) x D (Typ) x H (Max)

22.0 mm x 14.1 mm x 2.4 mm

Features

◼ Single Power Supply Input (Rated Voltage of 36 V)

◼ Rated Output Current: 3.0 A

◼ Rated Output Current (Peak): 3.5 A

◼ Low ON Resistance DMOS Output

◼ Power Save Function

◼ Power-on Reset Function

◼ CLK-IN Drive Mode

◼ 3-wire Serial Communication Mode

◼ PWM Constant Current Control

(Current Limit Function)

◼ Built-in Spike Noise Cancel Function

(External Noise Filter is Unnecessary)

◼ FULL STEP, HALF STEP and QUARTER STEP

Functionality

Typical Application Circuit

◼ Freely Timing Excitation Mode Switch

◼ Normal Rotation & Reverse Rotation

Switching Function

◼ Built-in Logic Input Pull-Down Resistor

◼ Thermal Shutdown Circuit (TSD)

◼ Under Voltage Lock Out Circuit (UVLO)

◼ Over Voltage Lock Out Circuit (OVLO)

◼ Protects Against Malfunction

when Power Supply is Disconnected

(Ghost Supply Prevention Function)

PREG

VCC

VREF

PS

GND

CLK

ENABLE

OUT1A

OUT1B

CW_CCW

MODE0

MODE1

Application

DRVMODE0

DRVMODE1

CSELECT1

CSELECT2

DEC

RNF1

◼ Carry Paper Currency, Ticket Machine, Amuse, PPC,

Multi-Function Printer, Laser Beam Printer

M

RNF1S

OUT2A

OUT2B

CR1

CR2

RNF2

RNF2S

〇Product structure : Silicon integrated circuit 〇This product has no designed protection against radioactive rays

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Pin Configuration

Block Diagram

[TOP VIEW]

PREG

VCC

Regulator

VREF

4 bit

DAC

TSD

OCP

OVLO

UVLO

GND

RNF1S

RNF2S

PS

RESET

CLK

ENABLE

CW_CCW

OUT1A

OUT1B

MODE0

MODE1

DRVMODE0

DRVMODE1

CSELECT1

CSELECT2

DEC

RNF1

RNF1S

OUT2A

OUT2B

Blank Time

PWM Control

CR1

CR2

OSC

RNF2

Blank Time

PWM Control

RNF2S

OSC

Pin Description

No.

Pin Name

Function

Pin Name

Function

1

2

3

4

GND

Ground pin

28

-

OUT2A

Open drain output pin

-

Connection pin of resistor

for output current detection

-

5

6

7

8

9

NC

No connection

29

-

RNF2

DRVMODE0 Input interface setting pin

PS Power save pin

-

Input pin

of current detection comparator

30

-

RNF2S

DRVMODE1 Input interface setting pin

-

CLK input pin for advancing

the electrical angle

CLK

-

10

11

12

13

14

15

16

CSELECT1

ENABLE

CSELECT2

CW_CCW

MODE0

ID setting pin

-

31

-

Output enable pin

OUT2B

Open drain output pin

ID setting pin

-

Motor rotating direction setting pin

Motor excitation mode setting pin

Output current value setting pin

-

MODE1

-

VREF

32

OUT1B

Open drain output pin

Connection pin of CR for setting

chopping frequency

Connection pin of CR for setting

chopping frequency

17

18

CR1

CR2

-

33

OUT1B

Open drain output pin

19

20

DEC

Synchronous rectification setting pin

IC internal voltage

-

PREG

Input pin

of current detection comparator

21

22

23

NC

No connection

Ground pin

34

-

RNF1S

-

GND

VCC

-

Connection pin of resistor

for output current detection

Power supply pin

35

RNF1

24

25

26

27

GND

Ground pin

-

36

OUT1A

Open drain output pin

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Function Explanation

1

VCC: Power supply pin

Motor’s drive current is flowing in it, so please connect it in such a way that the wire is thick & short and has low impedance.

VCC voltage may have great fluctuation, so please connect the bypass capacitor (100 μF to 470 μF) as close as possible

to the pin. Adjust in such a way that the VCC voltage is stable. Please increase the capacitance if needed, especially when

large current or motors that have great back electromotive force are used.

In addition, to reduce the power supply’s impedance in wide frequency bandwidth, parallel connection of multi-layered

ceramic capacitor (0.01 μF to 0.1 μF) is recommended. Extreme care must be observed to make sure that the VCC voltage

does not exceed the rating even for a moment.

Moreover, there is a built-in clamp device in the output pin to prevent electrostatic destruction. If sudden pulse or surge

voltage of more than the maximum absolute rating is applied, the clamp device operates which can result to destruction.

Please be sure to not exceed the maximum absolute rating. It is effective to mount a Zener diode with maximum absolute

rating. Also, diode is inserted between VCC pin and GND pin to prevent electrostatic destruction. If reverse voltage is

applied between VCC pin and GND pin, there is a danger of IC destruction so please be careful.

2

GND: Ground pin

In order to reduce the noise caused by switching current and to stabilize the internal reference voltage of IC, please connect

it in such a way that the wiring impedance from this pin is made as low as possible to achieve the lowest electrical potential

under any operating condition.

Design the pattern so that it does not have a common impedance with other GND patterns.

3

4

PREG: IC internal voltage

This is the regulator output pin for driving output transistors. PREG voltage may have great fluctuation, so please connect

the capacitor (0.1 μF) as close as possible to the pin. Adjust in such a way that the PREG voltage is stable.

PS: Power save pin

The PS pin can make circuit in STANDBY state and make motor output OPEN.

In STANDBY state, translator circuit is RESET (initialized) and electrical angle is initialized.

When PS = L to H, be careful because there is a delay of 40 μs (Max) before it is returned from STANDBY state to normal

state and the motor output becomes ACTIVE (Refer to P.14). During this time, the motor output logic is not fixed.

PS

L

Status

STANDBY (RESET)

ACTIVE

H

The electrical angle (initial electrical angle) of each excitation mode immediately after RESET is as follows (Refer to P.15,

16).

Excitation Mode

FULL STEP A

Initial Electrical Angle

45°

HALF STEP A

HALF STEP B

QUARTER STEP

5

ENABLE: Output enable pin

When using CLK-IN Drive Mode, turn off forcibly all the output transistors (motor output is open).

The translator circuit stop and the electrical angle doesn't advance in the section of ENABLE = L. Because CLK input is

blocked.

However, during excitation modes (MODE0, MODE1) switch within the interval of ENABLE = L, as ENABLE = L to H

is reset, the new mode upon switch will be applied for excitation (Refer to P.18).

ENABLE

Motor Output

OPEN(electrical angle maintained)

ACTIVE

L

H

When using 3-wire Serial Communication Mode, connect this pin to GND.

6

CLK: CLK input pin for advancing the electrical angle

Trigger is CLK’s rising edge. The Electrical angle advances by one for each CLK input. Motor’s misstep will occur if noise

is picked up at the CLK pin, so design the pattern in such a way that there is no noise plunging in.

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Function Explanation - continued

7

CW_CCW: Motor rotating direction setting pin

When using CLK-IN Drive Mode, sets the motor’s rotating direction.

Change in setting is reflected at the CLK rising edge immediately after the change in setting (Refer to P.17).

CW_CCW

Rotating Direction

L

Clockwise (CH2’s current is outputted with a phase lag of 90° in regard to CH1’s current)

Counter Clockwise(CH2’s current is outputted with a phase lead of 90° in regard to CH1’s current)

H

When using 3-wire Serial Communication Mode, input CSB signal (Refer to P.10).

8

MODE0, MODE1: Motor excitation mode setting pin

Set the motor excitation mode.

MODE0

MODE1

Excitation Mode

FULL STEP A

L

H

L

HALF STEP A

HALF STEP B

QUARTER STEP

H

Refer to the P.15, 16 for the timing chart and motor torque vector of various excitation modes.

The excitation mode setting changes regardless of CLK signal (Refer to P.18).

When using 3-wire Serial Communication Mode, input SCL signal to MODE0 pin and SDA signal to MODE1 pin

(Refer to P.11).

9

DEC: Synchronous rectification setting pin

In current decay mode, set the synchronous rectification (Refer to P.10).

DEC

L

Setting

No synchronous rectification

Synchronous rectification implemented

H

10 DRVMODE0, DRVMODE1: Input interface setting pin

Set the input interface mode.

DRVMODE0

DRVMODE1

Input Interface

L

H

CLK-IN Drive Mode

3-wire Serial Communication Mode A

3-wire Serial Communication Mode B

H

X^{(Note 1)}

Fix the logic of DRVMODEx pin at PS = L state or before UVLO release, and do not change during operation.

Refer to P.11 for the various input interface mode.

(Note 1) x = L or H

11 CSELECT1, CSELECT2: ID setting pin

Set the IC’s ID.

When using 3-wire Serial Communication Mode, you can choose which IC to send the serial data to.

CSELECT1

CSELECT2

ID

L

M

H

L

No.0

No.1

No.2

No.3

No.4

No.5

No.6

L

M

H

M

H

L

CSELECTx^{(Note 2)}Input Voltage [V]

Logic

0 to 0.7

1.2 to 1.9

2.4 to 5.0

L

M

H

Fix the logic of CSELECTx pin at PS = L state or before UVLO release, and do not change during operation.

(Note 2) x = 1, 2

12 OUT1A, OUT1B, OUT2A, OUT2B: Open drain output pin

Motor’s drive current is flowing in this pin, design the wire in such a way that it is thick enough, as short as possible and

has low impedance. It is also effective to add a Schottky diode when the output has large positive and negative fluctuations

when large current is used, for example when the back electromotive voltage is large.

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Function Explanation – continued

13 RNF1, RNF2: Connection pin of resistor for output current detection

Insert current detecting resistor of 0.13 Ω to 0.28 Ω between RNF_X^{(Note 1)}and GND.

The power consumption of current detecting resistor (W) can be calculated by the motor output current value (I_OUT) and

resistance for current detecting resistor (R_RNF).

푊 = 퐼_푂푈푇²× 푅_ꢀ푁퐹

[W]

Where:

푊

퐼_푂푈푇

푅_ꢀ푁퐹

:

is the power consumption of current detecting resistor [W]

is the motor output current value [A]

is the current-detecting resistor [Ω]

To avoid exceeding the rated power consumption of the resistor, consider its power consumption. In addition, design it in

such a way it that it has low impedance and does not have a common impedance with other GND patterns because motor’s

drive current flows through this pattern from the RNF_Xpin to current-detecting resistor to GND. Do not exceed the rating

because there is the possibility of circuits’ malfunction etc., if the RNF_Xvoltage has exceeded the maximum rating (1.0 V).

Moreover, be careful because if the RNF_Xpin is shorted to GND, large current flows without normal PWM constant current

control, then there is the danger that OCP or TSD will operate. If the RNF_Xpin is open, then there is the possibility of such

malfunction as output current does not flow either, so do not let it open.

(Note 1) x = 1, 2

14 RNF1S, RNF2S: Input pin of current detection comparator

In this IC, the RNFxS^{(Note 2)}pin, which is the input pin of current detection comparator, is independently arranged in order

(Note 2)

to decrease the lowing of the current-detecting accuracy caused by the wire impedance inside the IC of the RNF_X

pin. Therefore, be sure to connect the RNF_Xpin and the RNF_XS pin together when using the device in the case of PWM

constant current control. In addition, impedance of board pattern between the RNF_Xpin and the current-detecting resistor

can decrease accuracy, so connect RNF_XS pattern in such a way it is connected near the current-detecting resistor so

accuracy can be increased. Moreover, design the pattern in such a way that there is no noise plunging in. In addition, be

careful because if the RNF_XS pin is shorted to GND, large current flows without normal PWM constant current control and,

then there is the danger that OCP or TSD will operate.

(Note 2) x = 1 or 2

15 VREF: Output current value setting pin

This is the pin to set the output current value. It can be set by VREF voltage (V_VREF) and current-detecting resistor (R_RNF).

푉

1

ꢁꢂ퐸ꢃ

퐼_푂푈푇

=

×

[A]

5

ꢀ

ꢂꢄꢃ

Where:

퐼_푂푈푇

:

is the output current. [A]

ꢅ_푉ꢀꢆ퐹

푅_ꢀ푁퐹

is the voltage of output current value-setting pin. [V]

is the current-detecting resistor. [Ω]

:

Avoid using the VREF pin open because input becomes unsettled, and the VREF voltage increases, and then there is the

possibility of such malfunctions as the setting current increases and a large current flows etc. Keep to the input voltage

range because if the voltage of above 3 V is applied on the VREF pin, then there is also the danger that a large current

flows in the output and so OCP or TSD will operate. Besides, take into consideration the outflow current (2 μA (Max)) if the

input used is a resistor divider. The minimum current, which can be controlled by VREF voltage, is determined by motor

coil’s L, R values and minimum ON time because there is a minimum ON time in PWM drive.

16 CR1, CR2: Connection pin of CR for setting chopping frequency

This is the pin to set the chopping frequency of output. Connect the external C (220 pF to 8000 pF) and R (2 kΩ to 400

kΩ) between this pin and GND. Refer to P.9.

Make the connection from external components to GND in such a way that there is no common impedance with other GND

patterns. In addition, keep the pattern away from steep pulses like square waves, etc. and there is no noise plunging in.

When CRx^{(Note 3)}pin is open or it is biased from the outside, it is not possible to control normal PWM constant current, so

if it is used in PWM constant current control, always put both C and R parts.

(Note 3) x = 1, 2

17 NC: No connection

This pin is unconnected electrically with IC internal circuit.

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Protection Circuits

1

Thermal Shutdown (TSD)

This IC has a built-in thermal shutdown circuit for thermal protection. When the IC’s controller chip temperature rises 150 °C

(Typ) or more, the motor output becomes OPEN. Also, when the temperature returns to 125 °C (Typ) or less, it automatically

returns to normal operation. However, even when TSD is in operation, if heat is continued to be added externally, heat

overdrive can lead to destruction.

It is not possible to follow the output transistor junction temperature rising rapidly because it is a controller chip that monitors

the temperature and it is likely not to function effectively.

2

Over Current Protection (OCP)

This IC has a built-in over current protection circuit as a provision against destruction when VCC-motor output is shorted.

This circuit latches the motor output to OPEN condition when the RNFx^{(Note 1)}voltage exceeds 2.5 V (Typ) for 4 μs (Typ).

It returns with power reactivation or a reset by the PS pin. The over current protection circuit’s only aim is to prevent the

destruction of the IC from irregular situations such as motor output shorts, and is not meant to be used as protection or

security for the set. Therefore, sets should not be designed to take into account this circuit’s functions. After OCP operating,

if irregular situations continue and the return by power reactivation or a reset by the PS pin, then OCP operates repeatedly

and the IC may generate heat or otherwise deteriorate. When the L value of the wiring is great due to the wiring being long,

the motor outputs are shorted each other or VCC-motor output or motor output-GND is shorted., if the output pin voltage

jumps up and the absolute maximum values can be exceeded after the over current has flowed, there is a possibility of

destruction. Also, when current which is the output current rating or more and the OCP detection current or less flows, the

IC can heat up to Tjmax = 150 °C exceeds and can deteriorate, so current which or more the output rating should not be

applied.

(Note 1) x = 1, 2

3

4

Under Voltage Lock Out (UVLO)

This IC has a built-in under voltage lock out function to prevent false operation such as IC output during power supply

under voltage is low. When the applied voltage to the VCC pin goes 5 V (Typ) or less, the motor output is set to OPEN.

This switching voltage has a 1 V (Typ) hysteresis to prevent false operation by noise etc. Be aware that this circuit does

not operate during power save mode. Also, the electrical angle is reset when he UVLO circuit operates.

Over Voltage Lock Out (OVLO)

This IC has a built-in over voltage lock out function to protect the IC output and the motor during power supply over voltage.

When the applied voltage to the VCC pin goes 32 V (Typ) or more, the motor output is set to OPEN. This switching voltage

has a 1 V (Typ) hysteresis and a 4 μs (Typ) mask time to prevent false operation by noise etc.

Although this over voltage locked out circuit is built-in, there is a possibility of destruction if the absolute maximum value

for power supply voltage is exceeded. Therefore, the absolute maximum value should not be exceeded. Be aware that this

circuit does not operate during power save mode.

5

6

Protects against malfunction when power supply is disconnected (Ghost Supply Prevention Function)

If a control signal^{(Note 2)}is input when there is no power supplied to this IC, there is a function which prevents a malfunction

where voltage is supplied to power supply of this IC or other IC in the set via the electrostatic destruction prevention diode

from these input pins to the VCC_X. Therefore, there is no malfunction of the circuit even when voltage is supplied to these

input pins while there is no power supply.

(Note 2) control signal = PS, ENABLE, CLK, CW_CCW, MODE0, MODE1, DEC, DRVMODE0, DRVMODE1, CSELECT1, CSELECT2, VREF

Operation Under Strong Electromagnetic Field

The IC is not designed for using in the presence of strong electromagnetic field. Be sure to confirm that no malfunction is

found when using the IC in a strong electromagnetic field.

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Absolute Maximum Ratings (Ta = 25 °C)

Item

Symbol

Rated Value

Unit

Supply Voltage Range

V_CC

V_IN

-0.2 to +36.0

-0.2 to +5.5

1.0

V

Input Voltage Range for Control Pin^{(Note 1)}

RNF_X^{(Note 2)}Maximum Voltage

Output Voltage

V

V_RNF

V_OUT

I_OUT

V

100

3.0^{(Note 3)}

3.5^{(Note 3)}

-55 to +150

+150

A/Phase

°C

Output Current (Continuous)

Output Current (Peak Value)

Storage Temperature Range

Maximum Junction Temperature

I_OUTPEAK

Tstg

Tjmax

°C

(Note 1) Input Voltage for Control Pin = PS, ENABLE, CLK, CW_CCW, MODE0, MODE1, DEC, DRVMODE0, DRVMODE1, CSELECT1, CSELECT2, VREF

(Note 2) x = 1, 2

(Note 3) Do not exceed Tjmax = 150 °C.

Caution 1: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit

between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is

operated over the absolute maximum ratings.

Caution 2: Should by any chance the maximum junction temperature rating be exceeded the rise in temperature of the chip may result in deterioration of the

properties of the chip. In case of exceeding this absolute maximum rating, design a PCB with thermal resistance taken into consideration by increasing

board size and copper area so as not to exceed the maximum junction temperature rating.

Recommended Operating Condition

Item

Symbol

Min

Typ

Max

Unit

Supply Voltage

V_CC

Topr

I_OUT

8

-25

-

24

+25

-

28

+85

2.4^{(Note 4)}

V

°C

Operating Temperature

Maximum Output Current (Continuous)

A/Phase

(Note 4) Do not exceed Tjmax = 150 °C.

Thermal Resistance ^{(Note 5)}

Parameter

Symbol

Thermal Resistance (Typ)

Unit

1s^{(Note 7)}

2s2p^{(Note 8)}

SSOP-A54_36

Junction to Ambient

Junction to Top Characterization Parameter^{(Note 6)}

θ_JA

74.8

39

52.1

32

°C/W

Ψ_JT

(Note 5) Based on JESD51-2A (Still-Air), using a BM6343FS-Z Chip.

(Note 6) The thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of the outside surface

of the component package.

(Note 7) Using a PCB board based on JESD51-3.

(Note 8) Using a PCB board based on JESD51-7.

Layer Number of

Measurement Board

Material

FR-4

Board Size

Single

114.3 mm x 76.2 mm x 1.57 mmt

Top

Copper Pattern

Thickness

70 μm

Footprints and Traces

Layer Number of

Measurement Board

Material

FR-4

Board Size

4 Layers

114.3 mm x 76.2 mm x 1.6 mmt

2 Internal Layers

Top

Copper Pattern

Bottom

Copper Pattern

74.2 mm x 74.2 mm

Thickness

70 μm

Copper Pattern

Thickness

35 μm

Thickness

70 μm

Footprints and Traces

74.2 mm x 74.2 mm

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Electrical Characteristics (Unless otherwise specified V_CC= 24 V, Ta = 25 °C)

Specification

Item

Symbol

Unit

Condition

Min

Typ

Max

[Whole]

Circuit Current at Standby

Circuit Current

I_CCST

I_CC

-

0

10

μA

PS = L

5.0

6.5

mA

PS = H, VREF = 3 V

[Control Logic Input^{(Note 1)}

H-level Input Voltage

L-level Input Voltage

H-level Input Current

L-level Input Current

]

V_INH

V_INL

I_INH

I_INL

2.0

-

V

0.8

100

-

35

-10

50

0

μA

V_IN= 5 V

V_IN= 0 V

[Output^{(Note 2)}

]

Output ON Resistance

Output Leak Current

[Current Control]

R_ON

-

0.10

-

0.20

10

Ω

I_OUT= 1.0 A

I_LEAK

μA

RNF_XS^{(Note 3)}Input Current

VREF Input Current

I_RNFS

I_VREF

V_VREF

-2.0

0

-0.1

-

μA

V

RNF_XS = 0 V

VREF = 0 V

VREF Input Voltage Range

3.0

Minimum ON Time

(Cancel time)

t_ONMIN

1.0

2.6

5.2

μs

C = 1000 pF, R = 39 kΩ

VREF = 3 V

Comparator Threshold

V_CTH

0.579

0.600

0.621

V

(Note 1) Control Logic Input = PS, ENABLE, CLK, CW_CCW, MODE0, MODE1, DEC, DRVMODE0, DRVMODE1

(Note 2) Output = OUT1A, OUT1B, OUT2A, OUT2B

(Note 3) x = 1, 2

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PWM Constant Current Control

1

Current Control Operation

When the output transistor is turned on, the output current increases. The output current is converted to voltage due to the

connected external resistance to the RNF_X^{(Note 1)}pin. When the voltage on the RNF_Xpin reaches the voltage value set by

the VREF input voltage, the current limit comparator operates and enters current decay mode. Output turns on again after

changing the CR Timer to charge state from discharge state. The process repeats itself with chopping period t_CHOP

.

(Note 1) x = 1, 2

2

3

Noise Cancel Function

In order to avoid misdetection of current detection comparator due to RNF spike noise that may occur when the output

turns ON, the IC has the minimum ON time t_ONMIN(Cancel Time). The current detection is invalid from the output transistor

turned on to t_ONMIN. This allows for constant-current drive without the need for an external filter.

CR Timer

The external capacitor and resistor connected to the CRx^{(Note 2)}pin is repeatedly charged and discharged between the

V_CRHand V_CRLlevels. The CRx pin voltage decides in IC and it is V_CRL= 0.4 V, V_CRH= 0.8 V respectively. The output of the

current detection comparator is masked while charging from V_CRLto V_CRH. As mentioned above, this period defines the

minimum ON-time. When the output current reaches the current limit, the IC enters decay mode and the CRx pin begins

discharging once the voltage reaches V_CRH. The CR continues to discharge during this period until it reaches V_CRL, at which

point the IC output is switched back ON. The current output and the CR pin begin charging simultaneously. The CR charge

time (t_ONMIN) and discharge time (t_DISCHARGE) are set by external components, according to the following formulas.

′

−0.4

−0.8

푡_{푂푁푀ꢇ푁}≒ 퐶 × ^{ꢀ ×ꢀ}

_{ꢀ +ꢀ}× 푙푛 (^푉_푉

) [s]

ꢈꢂ

′

ꢈꢂ

푡_{푂푁푀ꢇ푁}

퐶

푅

푅ꢉ

:

is the minimum ON-time. [s]

is the capacitance of the CR Pin. [F]

is the resistance of the CR Pin. [Ω]

is the CRx Pin internal impedance 5 kΩ (Typ)

is the CRx Pin voltage. [V]

0.30

0.25

0.20

0.15

0.10

0.05

0.00

ꢅ

ꢊꢀ

ꢀ

′

ꢅ_ꢊꢀ= ꢅ × _{ꢀ +ꢀ}[V]

α

ꢅ

:

is the internal regulator voltage 5 V (Typ).

푡_{퐷ꢇ푆ꢊ퐻퐴ꢀ퐺ꢆ}≒ 퐶 × 푅 × 푙푛 (^0.8+훼) [s]

0

500

1000

1500

2000

C [pF]

0.4

푡_{퐷ꢇ푆ꢊ퐻퐴ꢀ퐺}

ꢋ

:

is the CR discharge time. [s]

Refer to the right graph.

Figure 1. CR Coefficient for Calculation of Discharge Time

(Note 2) x = 1, 2

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PWM Constant Current Control – continued

3

CR Timer – continued

Spike Noise

Current Limit

Output Current

0 mA

Current Limit

RNFx^{(Note 1)}Voltage

GND

0.9 V

0.8 V

CRx^{(Note 1)}Voltage

0.4 V

GND

Minimum ON Time Discharge

Chopping Period

t_CHOP

Time

t_ONMIN

t_DISCHARGE

Figure 2. Timing Chart of CRx Voltage, RNFx Voltage and Output Current

Attach a resistor of at least 2 kΩ to the CRx Pin (2 kΩ to 400 kΩ recommended) as lower values may keep the CRx from

reaching the V_CRHvoltage level. A capacitor in the range of 220 pF to 8000 pF is also recommended. Using capacitance

value of several thousand pF or more, however, the noise-masking period (t_ONMIN) also increases, and there is a risk that

the output current may exceed the setting value due to the internal L and R components of the output motor coil. Also,

ensure that the chopping period t_CHOPis not set longer than necessary, as doing so will increase the output ripple, thereby

decreasing the average output current and yielding lower output rotation efficiency. Select optimal value so that motor drive

sound, and distortion of output current waveform can be minimized.

(Note 1) x = 1, 2

4

Synchronous Rectification

PWM Constant Current Control can be optionally set the synchronous rectification by the logic of DEC pin.

The following diagrams show the state of each output transistor and the regenerative current path during the current decay

for each setting.

No Synchronous Rectification

M

Synchronous Rectification Implemented

M

ON→OFF

OFF→OFF

ON→OFF

OFF→ON

Current ON Time

Current Decay Time

Figure 3. The State of Each Transistor and The Regenerative Current Path during The Current Decay

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3-wire Serial Communication

This chip is equipped with 8-bit 3-wire Serial Communication Mode as an input interface for controlling the drive of the motor.

In L section of the CSB pin, the SDI logic is sent to the internal shift register at the rising edge of SCL pin.

The input order of serial data is D7→D0. The input waveform image is shown below.

CSB (CW_CCW)

SCL (MODE0)

SDI (MODE1)

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

IC Select IC Control IC Control

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

IC Select IC Control

Figure 4. 3-wire Serial Communication Input Waveform

IC selection is performed with 8 bits immediately after the falling of CSB, and IC is controlled with the subsequent 8 bits.

If CSB starts in the middle of 8-bit cycle, the data for that cycle will not be transmitted.

In IC select, the IC can be selected by setting the ID of IC to which the signal is wanted to be sent to “1”.

The IC control signal is sent only to IC for which the selected ID is set. Also, multiple IDs can be selected.

In addition, during 8 bit serial signal, don’t input the CLK signal and change the logic of DEC pin at the timing shown in the

below.

Don't input the CLK signal and change the logic of DEC pin

1 μs

MODE0 / SCL

MODE1 / SDI

D7

D6

D1

D0

1

3-wire Serial Communication Mode A

When DRVMODE0 = L and DRVMODE1 = H, the 3-wire Serial Communication Mode A is enabled (Refer to P.4).

The input bit assignment is shown below.

IC Select

ID

IC Control

Parameter

bit

Initial

D0

D1

D2

D3

D4

D5

D6

D7

No.0

MODE0

0

-

No.1

MODE1

No.2

CW_CCW

No.3

ENABLE

No.4

-

No.5

-

No.6

-

* Use D7 at 0.

* Use D4~D7 at 0.

The IC installed translator circuit will operate (Refer to P.14).

For details of each parameter in IC control, refer to P.3.

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3-wire Serial Communication – continued

2

3-wire Communication Mode B

When DRVMODE0 = H, the 3-wire Serial Communication Mode B is enabled (Refer to P.4).

The input bit assignment is shown below.

IC Select

ID

IC Control

bit

Parameter

Initial

D0

D1

D2

D3

D4

D5

D6

D7

No.0

I02

0

-

No.1

I12

No.2

I01

No.3

I11

No.4

PHASE1

No.5

PHASE2

No.6

-

* Use D7 at 0.

* Use D6, D7 at 0.

The IC installed translator circuit will not operate.

2.1 PHASE1, PHASE2 /Phase Switching Parameter

These are parameters that determine the output logic.

PHASE1

PHASE2

OUT1A

OUT1B

OUT2A

OUT2B

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

2.2 I01, I11, I02, I12 /VREF Division Ratio Setting Parameter

The VREF pin voltage is inputted to 2-bit DAC inside the IC, and is a parameter that sets the division ratio of 2-bit

DAC.

Set 1Ch output by I01 and I11, and 2Ch output byI02 and I12.

I0x^{(Note 1)}

I1x^{(Note 1)}

Output Current Level [%]

0

1

0

1

0

1

100

67

33

0

If (I0x, I1x) = (H, H), set each motor output to OPEN.

(Note 1) x = 1, 2

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3-wire Serial Communication – continued

3

Input Timing

The write timing of the serial port is shown below.

Ratings

Typ

Signal

CSB

Parameters

Symbol

t_CHW

Unit

Min

Max

CSB ”H” Pulse Width

CSB-SCL Time

400

200

1000

500

-

ns

(Note 2)

t_CSS

(Note 3)

t_CSH

-

Serial Clock Cycle

SCL “H” Pulse Width

SCL “L” Pulse Width

SCL Rising Edge Time

SCL Falling Edge Time

Data Setup Time

t_SCYC

t_SHW

t_CLW

t_r

-

SCL

SDI

-

50

-

t_f

-

t_SDS

t_SDH

250

Data Hold Time

-

(Note 2) The time from CSB falling edge to the first SCL rising edge.

(Note 3) The time from last SCL rising edge to the CSB rising edge.

t_CHW

t_CSS

t_CSH

CSB (CW_CCW)

t_SCYC

t_SHW

t_SLW

SCL (MODE0)

t_SDS

t_SDH

tr

tf

SDI(MODE1)

D7

D6

D0

D7

Figure 5. Input Timing

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Translator Circuit

This series has a built in translator circuit and can drive stepping motor.

The operation of the translator circuit in CLK-IN Drive Mode or 3-wire Serial Communication Mode A is described as below.

1

Reset Operation

The translator circuit is initialized by Power ON Reset Function and the PS pin.

1.1 Initializing Operation when Power Supply is Turned On

1.1.1 If Power Supply is Turned On at PS = L (Use this sequence as a general rule)

When power supply is turned on, the Power ON Reset Function is initialized and operates the IC, but as long

as it is PS = L, the motor output is the OPEN state. After power supply is turned on, the motor output becomes

ACTIVE state by changing PS = L to H, and the excitation is started at the initial electrical angle.

But at the time of PS = L to H, it returns from the STANDBY state to the normal state and there is a delay of

40 μs (Max) until the motor output has become the ACTIVE state.

Reset is released

Delay

ACTIVE

①

②

PS

CLK

OUT1A

OUT1B

Motor output OPEN

1.1.2 If Power Supply is Turned On at PS = H

Motor output ON

When power supply is turned on and the Power ON Reset Function in IC operates, and be initialized before

the motor output becomes the ACTIVE state during ENABLE = H, and the excitation is started at the initial

electrical angle.

1.2 Initializing Operation during Motor Operating

Enter a reset signal to the PS pin to initialize the translator circuit during motor operation. (Refer to P.17) But at the

time of PS = L to H, it returns from the STANDBY state to the normal state and there is a delay of 40 μs (Max) until

the motor output has become the ACTIVE state, so within this delay interval there is no phase advance operation

even if CLK is inputted.

2

Control Input Timing

Shown below is the operation of the translator circuit at the rising edge of CLK signal. If you disobey this timing and input,

then there is the possibility that the translator circuit does not operate as expected. In addition, at the time of PS = L to H,

it returns from the STANDBY state to the normal state and there is a delay of 40 μs (Max) until the motor output has become

the ACTIVE state, so within this delay interval there is no phase advance operation even if CLK is inputted.

A

PS

B

C

CLK

ENABLE

CW_CCW

MODE0

MODE1

DEC

D

E

F

G

F

G

A: PS Minimum Input Pulse Width … 20 μs

B: PS Rising Edge to CLK Rising Edge Input Possible Maximum Delay Time … 40 μs

C: CLK Minimum Period … 4 μs

D: CLK Minimum Input H Pulse Width … 2 μs

E: CLK Minimum Input L Pulse Width … 2 μs

F: ENABLE, CW_CCW, MODE0, MODE1, DEC Set-Up Time … 1 μs

G: ENABLE, CW_CCW, MODE0, MODE1, DEC Hold Time … 1 μs

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Translator Circuit – continued

3

FULL STEP (MODE0 = L, MODE1 = L, CW_CCW = L, ENABLE = H)

1

2

3

4

5

OUT1A

100%

67%

PS

CLK

¥¥

4

1

2

33%

OUT1A

OUT1B

OUT2A

OUT2B

OUT2A

3

100%

67%

33%

OUT1B

1Ch I_OUT

4CLK=Electrical Angle 360 °

-33%

-67%

-100%

100%

67%

33%

2Ch I_OUT

-33%

-67%

-100%

4

HALF STEP A (MODE0 = H, MODE1 = L, CW_CCW = L, ENABLE = H)

1

2

3

4

5

6

7

8

1

2

OUT1A

8

100%

67%

PS

CLK

¥¥

7

1

3

33%

OUT1A

OUT1B

OUT2A

OUT2B

6

2

OUT2B

OUT2A

5

4

100%

67%

33%

OUT1B

8CLK=Electrical Angle 360 °

1Ch I_OUT

-33%

-67%

-100%

100%

67%

33%

2Ch I_OUT

-33%

-67%

-100%

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Translator Circuit – continued

5

HALF STEP B (MODE0 = L, MODE1 = H, CW_CCW = L, ENABLE = H)

OUT1A

8

1

2

3

4

5

6

7

8

1

2

100%

67%

PS

CLK

¥¥

7

1

3

33%

OUT1A

OUT1B

OUT2A

OUT2B

6

2

OUT2B

OUT2A

5

4

100%

67%

33%

OUT1B

8CLK=Electrical Angle 360 °

1Ch I_OUT

-33%

-67%

-100%

100%

67%

33%

2Ch I_OUT

-33%

-67%

-100%

6

QUARTER STEP (MODE0 = H, MODE1 = H, CW_CCW = L, ENABLE = H)

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16

1

2

3

4

OUT1A

15

PS

CLK

100%

67%

14

16

¥¥

13

1

5

33%

OUT1A

OUT1B

OUT2A

OUT2B

2

12

11

10

3

OUT2B

OUT2A

4

9

8

6

7

100%

67%

33%

OUT1B

1Ch I_OUT

16CLK=Electrical Angle 360 °

-33%

-67%

-100%

100%

67%

33%

2Ch I_OUT

-33%

-67%

-100%

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Translator Circuit – continued

7

Reset Timing Chart (FULL STEP, MODE0 = L, MODE1 = L, CW_CCW = L , ENABLE = H)

To reset the translator circuit during motor operation regardless of the other input signals, enter the PS pin input to L. At

this time, IC internal circuit enters the STANDBY mode, and makes the motor output OPEN.

RESET

1

2

3

1

2

PS

CLK

OUT1A

OUT1B

OUT2A

OUT2B

1Ch I_OUT

2Ch I_OUT

8

CW_CCW Switch Timing Chart (FULL STEP, MODE0 = L, MODE1 = L, ENABLE = H)

The switch of CW_CCW is reflected by the rising edge of CLK that comes immediately after CW_CCW signal has changed.

However, depending on the state of operation of the motor at the time of switching, the motor cannot follow even if the

control on driver IC corresponds. There are possibilities of step-out and mistake step in motor, so evaluate the sequence

of the switch enough.

CW

CCW

1

2

3

2

1

PS

CLK

OUT1A

OUT1B

OUT2A

OUT2B

1Ch I_OUT

2Ch I_OUT

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Translator Circuit – continued

9

ENABLE Switch Timing Chart (FULL STEP, MODE0 = L, MODE1 = L,)

The switch of the ENABLE signal is reflected by the change in the ENABLE signal with regardless of other input signals.

The translator circuit stop and the electrical angle doesn't advance in the section of ENABLE = L. Because the output for

motor is OPEN and CLK input is blocked. When ENABLE = L to H, the output state returns immediately to the last state

before the input of ENABLE = L. Excitation mode (MODE0, MODE1) also switches within ENABLE = L interval. Where

excitation mode switched within ENABLE = L interval, restoring of ENABLE = L to H was done in the excitation mode after

switch.

Output off & Translator stop

1

2

3

PS

CLK

OUT1A

OUT1B

OUT2A

OUT2B

1Ch I_OUT

2Ch I_OUT

Restoring in the state prior to input of ENABLE=L

10 About the Switch of the Motor Excitation Mode

The switch of the excitation mode can be done with regardless of the CLK signal at the same time as changing of the signal

MODE0 and MODE1. The following built-in function can prevent motor out-of-step caused by discrepancies of torque

vector of transitional excitations during switch between excitation modes. Depending on the state of operation of the motor

at the switch the motor cannot follow even if the control on driver IC side is correspondent and there are possibilities of

step-out and mistake step in motor. Therefore, switch sequence shall be evaluated sufficiently before any decision.

11 Cautions of Bidirectional Switch of CW_CCW and Excitation Modes (MODE0, MODE1)

As shown in the figure below, the area between the end of reset discharge (PS = L to H) and beginning of the first CLK

signal input is defined as interval A, while the area until the end of the first CLK signal input is defined as interval B.

Interval A => For CW_CCW, no limitation is applied on switch of excitation mode.

Interval B => In CLK1 period, or within ENABLE = L interval, CW_CCW and excitation mode can’t be switched together.

Violation of this restriction may lead to false step (with one extra leading phase) or out-of-step. Therefore, in

case that CW_CCW and excitation modes are switched simultaneously, the PS pin must be input with reset

signal. Then start to operate in interval A before carrying out such bidirectional switch.

Interval A

Interval B

PS

CLK

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Power Dissipation

In consideration of the IC’s power consumption (W), thermal resistance (°C/W), and ambient temperature (Ta), confirm that

the IC’s chip temperature Tj is not over 150 °C. When Tj = 150 °C is exceeded, the functions as a semiconductor do not

operate and problems such as parasitism and leaks occur. Constant use under these circumstances leads to deterioration

and eventually destruction of the IC. Tjmax = 150 °C must be strictly obeyed under all circumstances.

Thermal Calculation

The IC’s consumed power can be estimated roughly with the power supply voltage (V_CC), circuit current (I_CC), output ON

resistance (R_ON) and motor output current value (I_OUT).

The calculation method during FULL STEP drive (No synchronous rectification) mode is shown here:

푊_푉ꢊꢊ= ꢅ_ꢊꢊ× 퐼_ꢊꢊ[W]

Where:

푊_푉ꢊꢊ

ꢅ_ꢊꢊ

퐼_ꢊꢊ

:

Is the consumed power of the V_CC[W]

Is the power supply voltage. [V]

Is the circuit current. [A]

푊_퐷푀푂푆= 푊_푂푁ꢌ 푊_{퐷ꢆꢊ퐴푌}[W]

푊_푂푁= 푅_푂푁× 퐼_푂푈푇²× ꢍ × 표푛_푑푢푡푦 [W]

ꢎ

ꢑ

푊_{퐷ꢆꢊ퐴푌}= ꢅ푓 × 퐼_푂푈푇× ꢍ × ꢏ ꢐ 표푛_푑푢푡푦 [W]

Where:

푊_퐷푀푂푆

푊_푂푁

푊_{퐷ꢆꢊ퐴푌}

푅_푂푁

:

is the consumed power of the output DMOS. [W]

is the consumed power during output ON. [W]

is the consumed power during current decay. [W]

is the N-channel DMOS ON-resistance. [Ω]

퐼_푂푈푇

is the motor output current value. [A]

푡_푂푁

표푛_푑푢푡푦

:

PWM on duty =

⁄

푡_ꢊ퐻푂푃

t_ONvaries depending on the L and R values of the motor coil and the current set value. Confirm by actual measurement, or

make an approximate calculation.

t_CHOPis the chopping period, which depends on the CRx^{(Note 1)}pin. Refer to P.9 for details.

(Note 1) x = 1, 2

IC Number

Nch DMOS ON Resistance R_ON[Ω] (Typ)

0.10

BM6343FS-Z

푊_푡표푡푎푙 = 푊_푉ꢊꢊꢌ 푊_퐷푀푂푆[W]

ꢒ푗 = ꢒ푎 ꢌ 휃푗푎 × 푊_푡표푡푎푙 [°C]

Where:

푊_푡표푡푎푙

ꢒ푗

ꢒ푎

:

is the consumed total power of IC. [W]

is the junction temperature. [°C]

is the ambient temperature. [°C]

is the thermal resistance value. [°C/W]

휃푗푎

However, the thermal resistance value θja [°C/W] differs greatly depending on circuit board conditions. The calculated values

above are only theoretical. For actual thermal design, perform sufficient thermal evaluation for the application board used, and

create the thermal design with enough margin not to exceed Tjmax = 150 °C.

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Application Example

Bypass capacitor.

Setting range is

100 μF to 470 μF (electrolytic)

0.01 μF to 0.1 μF (multilayer ceramic etc.)

Refer to P.3 for detail.

Bypass capacitor.

Connect 0.1 μF capacitor.

Refer to P.3 for detail.

Set the output current.

Input by resistor division.

Refer to P.5 for detail.

PREG

Regulator

VCC

0.1 µF

VREF

PS

4 bit

DAC

GND

0.1 µF

100 µF

TSD

OCP

OVLO

UVLO

Power save pin.

Refer to P.3 for detail.

RNF1S

RNF2S

RESET

CLK

ENABLE

Logic input pin.

Refer to P.3, 4 for detail.。

OUT1A

OUT1B

CW_CCW

MODE0

MODE1

DRVMODE0

DRVMODE1

CSELECT1

CSELECT2

DEC

RNF1

M

0.25 Ω

RNF1S

OUT2A

OUT2B

Blank Time

PWM Control

Resistor for current detection.

Setting range is

0.13 Ω to 0.28 Ω.

CR1

OSC

RNF2

Blank Time

PWM Control

39 kΩ

1000 pF

Refer to P.5 for detail.

0.25 Ω

RNF2S

CR2

OSC

39 kΩ

1000 pF

Resistor for current detection.

Setting range is

0.13 Ω to 0.28 Ω.

Refer to P.5 for detail.

Set the chopping frequency.

Setting range is

C:220 pF to 8000 pF

R:2 kΩ to 400 kΩ

Refer to P.5, 9 for detail.

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I/O Equivalence Circuit

No.

Pin Name

No.

Equivalence Circuit

Pin Name

Equivalence Circuit

7

11

9

PS

ENABLE

CLK

PS

ENABLE

CLK

CW_CCW

MODE0

MODE1

DEC

DRVMODE0

DRVMODE1

13

14

15

19

6

CW_CCW

MODE0

MODE1

DEC

10 kΩ

5 kΩ

10 kΩ

16

VREF

10 kΩ

100 kΩ

DRVMODE0

DRVMODE1

8

36

33

28

31

35

29

OUT1A

OUT1B

OUT2A

OUT2B

RNF1

10

12

34

CSELECT1

CSELECT2

RNF1S

OUT1A

OUT2A

OUT1B

OUT2B

CSELECT1

CSELECT2

10 kΩ

100 kΩ

RNF1

RNF2

Internal Regulator

RNF1S

RNF2S

5 kΩ

17

CR1

5 kΩ

CR1

CR2

5 kΩ

10 kΩ

5 kΩ

10 kΩ

30

RNF2S

18

CR2

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Operational Notes

1

2

Reverse Connection of Power Supply

Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when

connecting the power supply, such as mounting an external diode between the power supply and the IC’s power supply

pins.

Power Supply Lines

Design the PCB layout pattern to provide low impedance supply lines. Furthermore, connect a capacitor to ground at all

power supply pins. Consider the effect of temperature and aging on the capacitance value when using electrolytic

capacitors.

3

4

Ground Voltage

Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition.

Ground Wiring Pattern

When using both small-signal and large-current ground traces, the two ground traces should be routed separately but

connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal ground

caused by large currents. Also ensure that the ground traces of external components do not cause variations on the ground

voltage. The ground lines must be as short and thick as possible to reduce line impedance.

5

6

Recommended Operating Conditions

The function and operation of the IC are guaranteed within the range specified by the recommended operating conditions.

The characteristic values are guaranteed only under the conditions of each item specified by the electrical characteristics.

Inrush Current

When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may flow

instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power supply.

Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring, and routing of

connections.

7

8

9

Testing on Application Boards

When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may subject

the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should always

be turned off completely before connecting or removing it from the test setup during the inspection process. To prevent

damage from static discharge, ground the IC during assembly and use similar precautions during transport and storage.

Inter-pin Short and Mounting Errors

Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in

damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin. Inter-

pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and

unintentional solder bridge deposited in between pins during assembly to name a few.

Unused Input Pins

Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and

extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge

acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause

unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the power supply

or ground line.

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Operational Notes – continued

10 Regarding the Input Pin of the IC

This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated.

P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a parasitic diode

or transistor. For example (refer to figure below):

When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.

When GND > Pin B, the P-N junction operates as a parasitic transistor.

Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual interference

among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to operate, such as

applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should be avoided.

Resistor

Transistor (NPN)

Pin A

Pin B

B

E

C

Pin A

B

C

E

P

P⁺

N

P⁺

P

P⁺

N

Parasitic

Elements

Parasitic

Elements

P Substrate

GND GND

P Substrate

GND

Parasitic

Elements

Parasitic

Elements

N Region

close-by

Figure 6. Example of Monolithic IC Structure

11 Ceramic Capacitor

When using a ceramic capacitor, determine a capacitance value considering the change of capacitance with temperature

and the decrease in nominal capacitance due to DC bias and others.

12 Thermal Shutdown Circuit (TSD)

This IC has a built-in thermal shutdown circuit that prevents heat damage to the IC. Normal operation should always be

within the IC’s maximum junction temperature rating. If however the rating is exceeded for a continued period, the junction

temperature (Tj) will rise which will activate the TSD circuit that will turn OFF power output pins. When the Tj falls below

the TSD threshold, the circuits are automatically restored to normal operation.

Note that the TSD circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no

circumstances, should the TSD circuit be used in a set design or for any purpose other than protecting the IC from heat

damage.

13 Over Current Protection Circuit (OCP)

This IC incorporates an integrated overcurrent protection circuit that is activated when the load is shorted. This protection

circuit is effective in preventing damage due to sudden and unexpected incidents. However, the IC should not be used in

applications characterized by continuous operation or transitioning of the protection circuit.

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Ordering Information

Z E 2

B

M

6

3

4

3

F

S

-

Package Type

FS: SSOP-A54_36

Packaging, Forming specification

Z: Outside assembly

E2: Embossed tape and reel

Marking Diagram

SSOP-A54_36 (TOP VIEW)

Part Number Marking

LOT Number

BM6343FS

Pin 1 Mark

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Physical Dimension and Packing Information

Package Name

SSOP-A54_36

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Revision History

Date

Revision

001

Changes

25.Dec.2020

New Release

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Notice

Precaution on using ROHM Products

1. Our Products are designed and manufactured for application in ordinary electronic equipment (such as AV equipment,

OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you

intend to use our Products in devices requiring extremely high reliability (such as medical equipment ^{(Note 1)}, transport

equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car

accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or

serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.

Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any

damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific

Applications.

(Note1) Medical Equipment Classification of the Specific Applications

JAPAN

USA

EU

CHINA

CLASSⅢ

CLASSⅣ

CLASSⅡb

CLASSⅢ

2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor

products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate

safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which

a failure or malfunction of our Products may cause. The following are examples of safety measures:

[a] Installation of protection circuits or other protective devices to improve system safety

[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3. Our Products are designed and manufactured for use under standard conditions and not under any special or

extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way

responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any

special or extraordinary environments or conditions. If you intend to use our Products under any special or

extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of

product performance, reliability, etc, prior to use, must be necessary:

[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents

[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust

[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,

H2S, NH3, SO2, and NO2

[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves

[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items

[f] Sealing or coating our Products with resin or other coating materials

[g] Use of our Products without cleaning residue of flux (Exclude cases where no-clean type fluxes is used.

However, recommend sufficiently about the residue.) ; or Washing our Products by using water or water-soluble

cleaning agents for cleaning residue after soldering

[h] Use of the Products in places subject to dew condensation

4. The Products are not subject to radiation-proof design.

5. Please verify and confirm characteristics of the final or mounted products in using the Products.

6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse, is applied,

confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power

exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect

product performance and reliability.

7. De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in

the range that does not exceed the maximum junction temperature.

8. Confirm that operation temperature is within the specified range described in the product specification.

9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in

this document.

Precaution for Mounting / Circuit board design

1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

2. In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must

be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,

please consult with the ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Notice-PGA-E

Rev.004

Precautions Regarding Application Examples and External Circuits

1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the

characteristics of the Products and external components, including transient characteristics, as well as static

characteristics.

2. You agree that application notes, reference designs, and associated data and information contained in this document

are presented only as guidance for Products use. Therefore, in case you use such information, you are solely

responsible for it and you must exercise your own independent verification and judgment in the use of such information

contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses

incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic

This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper

caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be

applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,

isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation

1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:

[a] the Products are exposed to sea winds or corrosive gases, including Cl₂, H₂S, NH₃, SO₂, and NO₂

[b] the temperature or humidity exceeds those recommended by ROHM

[c] the Products are exposed to direct sunshine or condensation

[d] the Products are exposed to high Electrostatic

2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period

may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is

exceeding the recommended storage time period.

3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads

may occur due to excessive stress applied when dropping of a carton.

4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of

which storage time is exceeding the recommended storage time period.

Precaution for Product Label

A two-dimensional barcode printed on ROHM Products label is for ROHM’s internal use only.

Precaution for Disposition

When disposing Products please dispose them properly using an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade act

Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign

trade act, please consult with ROHM in case of export.

Precaution Regarding Intellectual Property Rights

1. All information and data including but not limited to application example contained in this document is for reference

only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any

other rights of any third party regarding such information or data.

2. ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the

Products with other articles such as components, circuits, systems or external equipment (including software).

3. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any

third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM

will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to

manufacture or sell products containing the Products, subject to the terms and conditions herein.

Other Precaution

1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written

consent of ROHM.

3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the

Products or this document for any military purposes, including but not limited to, the development of mass-destruction

weapons.

4. The proper names of companies or products described in this document are trademarks or registered trademarks of

ROHM, its affiliated companies or third parties.

Notice-PGA-E

Rev.004


型号：	BM6343FS-Z (开发中)
厂家：	ROHM
描述：	BM6343FS-Z是一款电源额定电压36V、额定输出电压100V、额定输出电流3.0A的高耐压单极步进电机驱动器。输入接口采用CLK-IN驱动方式和三线串行通信方式，通过内置DAC，励磁模式支持FULL STEP、HALF STEP和QUARTER STEP模式。此外，电源也可以用1个系统进行驱动，使应用产品的设计更容易。通信电机驱动驱动器
文件：	总29页 (文件大小：1289K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BM6343FS-Z (开发中) [ROHM]

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