BU21009MUV_技术文档

Capacitive Sensor Control IC Series

Capacitive Sensor Switch

Control IC

BU21009MUV

No.09048EBT03

●Description

BU21009MUV is the capacitive sensor controller for the switch function and slider function with 16 channels sensors.

All channels are calibrated for the slider functions. So this is useful for 16 switches application, too.

LED driver is available (No PWM function).

●Features

1) Slider function

2) LED driver available

3) 2 wire serial interface

4) Power supply = 2.5V to 3.3V, I/O power supply = 1.7V to 3.3V

5) Integrated 10bit AD converter, clock and reset

6) Package VQFN032V5050

●Applications

It is possible to use it widely as a switch/slider such as a Mobile phone, Portable equipment, and Audiovisual apparatuses.

●Absolute Maximum Ratings (Ta=25℃)

RATING

PARAMETER

SYMBOL

UNIT

V

MIN

-0.3

-55

MAX

4.5

AVDD

DVDD

VAIN

VDIN

Tstg

APPLIED VOLTAGE

4.5

AVDD+0.3

DVDD+0.3

125

INPUT VOLTAGE

V

STORAGE TEMPERATURE RANGE

POWER DISSIPATION

℃

Pd

304

mW

Ambient temperature reduces a permission loss by 3.1mW per case more than 25 degrees Celsius, 1 degree Celsius.

●Recommended Operating conditions

RATING

PARAMETER

SYMBOL

UNIT

MIN

2.5

1.7

-40

TYP

3.0

25

MAX

3.3

85

AVDD

DVDD

Topr

V

APPLIED VOLTAGE

OPERATINGTEMPERATURE RANGE

℃

www.rohm.com

2009.04 - Rev.B

1/13

Technical Note

BU21009MUV

●Electrical characteristics(Especially, Topr=25 ℃and AVDD=DVDD=0 as long as it doesn't specify it.)

RATING

PARAMETER

SYMBOL

UNIT

Condition

MIN

VIHIO DVDDx0.8

TYP

MAX

DVDD+0.3

DVDDx0.2

DVDD

0.5

H INPUT VOLTAGE

L INPUT VOLTAGE

Output "H" voltage

-

V

VILIO

VOHIO

VOLLED

DVSS-0.3

DVDD-0.7

AVSS

IOH=-2[mA]. Overshoot is excluded.

IOL=8[mA]. Undershoot is excluded. LED output.

IOL=3[mA]. Undershoot is

excluded. SDA/TXD

application.

IOL=2[mA]. Undershoot is excluded. INT

application.

0.5

DVDD > 2[V]

VOLTXD

VOLINT

DVSS

-

Output "L" voltage

V

DVDDx0.3

0.5

DVDD ≦2[V]

-1

1

μA

Input leakage current

Off leakage current

IIZ

-

IOZ

-

2

-

μA

Standby current

IST

IDD

Shutdown (SDN＝”L”)

300

Current of operation

●A/D Converter

RATING

PARAMETER

SYMBOL

UNIT

Condition

MIN

TYP

MAX

Resolution

-

10

-

AVDD

2.0

-

bit

V

Analog Input voltage

change clock frequency

change time

Zero scale voltage

full scale voltage

VAIN

fadck

ftim

AVSS

0.2

-

77

-

MHz

μsec fadck = 1[MHz]

V

AVSS+0.07

AVDD-0.07

-

differential Non line accurate

Integrate Non line accurate

DNL

INL

-

±3

LSB

-

●CR Oscillator characteristic

PARAMETER

RATING

TYP

SYMBOL

fcr

UNIT

MHz

Condition

MIN

0.4

MAX

2.0

Frequency Oscillation

1.1

www.rohm.com

2009.04 - Rev.B

2/13

Technical Note

BU21009MUV

●Block Diagram, Pin configuration

AVDD

DVDD

SREF

Sensor I/F、

CV translate

circuit

DVSS

DVDD

MODE[1]

Data correction and

making to format

ADC

SIN[15:0]

MODE[0]

AVDD

SREF

AVSS

CS

SCL

TSTA

Conversion

sequence control

SIN[0]

SIN[15]/LED[7]

SIN[4]

Data register

SIN[1]/LED[0]

SIN[2]

SDA/TXD

SIN[13]/LED[6]

SIN[12]

host I/F

RXD

SDN

SIN[3]/LED[1]

Reset

Power

management

generation

Clock

INT

generation

Power

on

Reset

CR

oscill

ation

MODE[1:0]

CLK_EXT

AVSS

DVSS

・Sensor I/F CV translate circuit

This module selects between sensor inputs. The selection sequences between all 16 channels.

・AD Conversion

The voltage into which CV is converted is converted into a digital value.

Conversion is 10 bit and full scale corresponds to AVDD.

・Conversion sequence control

Performs timing generation for the analogue circuitry and a sequencer circuit for selection of the sensor channel for conversion.

・Data correction and making to format

This module provides the digital intelligence of the sensor.

The block includes, amongst other things, scaling, adding offsets and input filtering for de-bouncing.

Registers are formatted to simplify usage by the softwareapplication.

The block implements auto-calibration to manage drift in temperature, process variation, voltage variation and aging effects.

・Data register

This stores the results for the software application. Please refer to the register map for details.

・HOST I/F

2 wire serial interface.

・Power management

The power management block provides smart power control.

When the sensors are not in use, the Controller automatically transitions into a low-power mode.

When a sensor is touched, then the device automatically wakes up and enters its normal operation.

The chip drives an INT pin for alerting the controller device in this case.

・Reset generation

The circuit is initialized by a either a soft reset command or by the external SDN pin.

・Clock generation

The device has an internal oscillator.

Provision is also made if the application would like to make use of an external clock input.

www.rohm.com

2009.04 - Rev.B

3/13

Technical Note

BU21009MUV

●Pin Description

Supply

Reference Level

Reset

Name

No.

I/O

Function

sensor input4

Note

-

I/O Pad

1

SIN4

AIn

AVDD

"Hi-Z"

④

sensor input 5

/PW Drive LEDcontrol output 2

sensor input ,

LED drive select

2

SIN5/LED2 AIn/Out

3

SIN6

AIn

sensor input6

-

sensor input 7

/PWM Drive LED control output 3 LED drive select

sensor input ,

4

SIN7/LED3 AIn/Out

5

SIN8

SIN9/LED4 AIn/Out

SIN10 AIn

SIN11/LED5 AIn/Out

AIn

sensor input8

-

sensor input 9

/LED control output 4

sensor input ,

LED drive select

6

7

sensor input10

-

sensor input 11

/LED control output 5

sensor input ,

LED drive select

8

9

SIN12

AIn

AIn/Out

AIn

sensor input12

-

SIN13/LED

6

sensor input 13

/LED control output 6

sensor input ,

LED drive select

10

11

12

SIN14

sensor input14

-

SIN15/LED

7

sensor input 15

/LED control output 7

sensor input ,

AIn/Out

LED drive select

NC on the substrate is

recommended.

13

TSTA

AIn

Test input for analog block

AVDD

"Hi-Z"

④

14

15

16

17

18

AVSS

MODE[0]

MODE[1]

TSTD

Ground Analog ground

-

In

Mode selection, input0

DVDD

①

00 = 2wires serial,

internal clock

Mode selection, input1

Digital part test input

Usually must be tide to "L"

Usually tide to"L"

CLK_EXT

External system clock input

"L" : Active mode

"H" : Idle mode ※2

19

20

INT

Out

Output of interrupt

DVDD

"L"

③

"Hi-Z"

-

Communication data sending and

receiving(2wires serial)

⑤

②

SDA/TXD

In/Out

-

Communication

21

22

23

24

SCL

RXD

CS

In

-

DVDD

-

②

-

synchronous clock input

system clock input

(2wires serial)

Slave address selection

(2wires serial mode)

"L" : Internal clock

"H" : external clock

"L" : 5Ah

"H" : 5Bh

"L" : Halt condition

"H" : state of operation

SDN

Shutdown input

25

26

27

28

29

DVSS

DVDD

AVDD

SREF

SIN0

Ground Digital part ground

-

Power Digital part Power supply

Power Analog part Power supply

-

④

AIn

Standard capacitor input

AVDD

"Hi-Z"

sensor input 0

sensor input 1

-

sensor input ,

30 SIN1/LED0 AIn/Out

AVDD

"Hi-Z"

④

/PWM Drive LEDcontrol output 0 LED drive select

31

SIN2

AIn

sensor input 2

sensor input 3

-

sensor input ,

32 SIN3/LED1 AIn/Out

/PWM Drive LEDcontrol output 1 LED drive select

When internal organs power-on reset is effective

*1 Initial State

Halt condition SDN=”L”

www.rohm.com

2009.04 - Rev.B

4/13

Technical Note

BU21009MUV

●I/O Circuit

①CMOS INPUT

②CMOS Schmitt INPUT

③CMOS OUTPUT

I

PAD

CIN

PAD

CIN

PAD

④CMOS 3stute OUTPUT

with ANALOG-SW

⑤CMOS Schmitt INOUT

ASW

AIN

CIN

I

PAD

I

PAD

OEN

OE

www.rohm.com

2009.04 - Rev.B

5/13

Technical Note

BU21009MUV

●HOST I/F

・ 2 wire serial, BUS (Pin configuration, MODE［1:0］＝00b)

Slave mode only

Slave Address = 5Ch,5Dh selection possible.

Normal (Normal mode. 100kHz Transfer rate)

Fs mode (Fast mode. 400kHz Transfer rate) also.

Not adapting sequential read / write.

【Data format】

t_SU;STO

t_HD;STA

SDA

t_SU;DAT

t_HD;DAT

SCL

Read

ACK

Data

Address

ACK

Parameter

Standard mode

High Speed mode

Unit

MIN

0

MAX

100

-

MIN

0

MAX

400

-

0.9

-

fSCL : SCL Clock Freq

t_HD;STA: START condition hold time

t_LOW: SCL “L”

kHz

μsec

4.0

4.7

4.0

0.1

0.25

4.0

4.7

0.6

1.3

0.6

0.1

0.6

1.3

t_HIGH: SCL “H”

-

t_HD;DAT: Data hold time

t_SU;DAT: Data setup time

t_SU;STO: START condition hold time

3.45

-

t_BUF: Free time of bus between STOP condition and START condition

【PROTOCOL】

・Write Protocol

REGISTER

ADDRESS

S

SLAVE ADDRESS

7bit = 5Ch or 5Dh

W

A

WRITE DATA

8bit

A

P

8bit

・Read Protocol

REGISTER

ADDRESS

S

SLAVE ADDRESS

7bit = 5Ch or 5Dh

S

SLAVE ADDRESS R

A

READ DATA

8bit

N

P

8bit

7bit = 5Ch or 5Dh

= START condition

= STOP condition

from Master to Slave

from Slave to Master

S

P

R

W

A

= data direction READ (SDA HIGH)

= data direction WRITE (SDA LOW)

= acknowledge (SDA LOW)

N

= not acknowledge (SDA HIGH)

www.rohm.com

2009.04 - Rev.B

6/13

Technical Note

BU21009MUV

●Register map

Address

Register name

SENS_DATA

POSX

R/W

R

Length

Explanation

1*h

30h

1byte / channel Sensor output data. One for each channel.

R

1byte

2byte

X positional value axially.

Y positional value axially.

Button On/Off.

31h

POSY

R

32h, 33h

4*h

BTN

R

OFFSET

POS_MODE

RESET

R

1byte / channel Offset correction data. One for each channel.

ECh

W

1byte

2byte

1byte

2byte

1byte

2byte

1byte

XY matrix setting.

EDh

Soft reset execution.

EEh

CALIB

Soft calibration execution.

Setting done command.

Sensor channel enables.

LED channel enables.

Idle mode release control.

LED linkage to sensor input.

EFh

DONE

F0h, F1h

F2h

SENS_CH

LED_CH

IDLE_CH

LED_LINK

TIMES

F3h, F4h

F5h

Defines the sampling interval and number of samples

required to recognize a button press.

F6h

A second threshold value in the detection of a button going

from OFF state to ON state.

F7h

TH_ON2

TH_ON2_CH

CMD

F8h, F9h

FAh

Per channel selection of whether to use TH_ON or TH_ON2.

Simultaneous press and idle mode entry.

Gain setting, filter function.

FBh

GAIN_FILTER

TH_ON

A threshold value in the detection of a button going from OFF

state to ON state.

FCh

A threshold value in the detection of a button going from ON

state to OFF state.

FDh

TH_OFF

DLED

FEh

Register to allow simple writing to LEDs.

www.rohm.com

2009.04 - Rev.B

7/13

Technical Note

BU21009MUV

【1*h : Sensor Output Data】

Name:

SENS_DATA

Address:

1* h (one byte per sensor channel)

Description: The sensor output that converts to 10bit. Scaling, offsets and filtering (when enabled) are applied.

The most significant 8 bits are presented to the software with this register.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

1*h

R/W

Initial val.

SD_*[7]

SD_*[6]

SD_*[5]

SD_*[4]

SD_*[3]

SD_*[2]

SD_*[1]

SD_*[0]

R

1

R

0

R

0

R

0

R

0

R

0

R

0

R

0

【30h : X positional value axially】

Name:

Address:

POSX

30h

Description: This represents the X-position of the press. The value is calculated differently depending on the matrix

arrangement. For example when:

・When POS_MODE[0]=0： Value interprets SIN[0:7]

・When POS_MODE[0]=1： Value interprets SIN[10:5]

Bit7

0

R

Bit6

0

R

Bit5

D5

R

Bit4

D4

R

Bit3

D3

R

Bit2

D2

R

Bit1

D1

R

Bit0

D0

R

30h

R/W

【31h : Y positional value axially】

Name:

Address:

POSY

31h

Description: This represents the Y-position of the press. The value is calculated differently depending on the matrix

arrangement. For example when:

・When POS_MODE[0]=0： Value interprets SIN[8:15]

・When POS_MODE[0]=1： Value interprets SIN[11:4:12:3:13:2:14:1:15:0]

Bit7

0

R

Bit6

D6

R

Bit5

D5

R

Bit4

D4

R

Bit3

D3

R

Bit2

D2

R

Bit1

D1

R

Bit0

D0

R

31h

R/W

【32h / 33h : Button ON/OFF】

Name:

BTN

Address:

Description:

32h, 33h

This is the state of the sensor when considered as an ON/OFF button. Here 1 : On. 0 :Off.

Bit7

CH7

CH15

R

Bit6

CH6

CH14

R

Bit5

CH5

CH13

R

Bit4

CH4

CH12

R

Bit3

CH3

CH11

R

Bit2

CH2

CH10

R

Bit1

CH1

CH9

R

Bit0

CH0

CH8

R

32h

33h

R/W

Initial val.

0

【4* h : Offset Correction Data】

Name:

Address:

OFFSET

4* h (one byte per sensor channel)

Description: This is the offset required to correct the sense data to half scale during the calibration procedure.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

4*h

R/W

Initial val.

OFS_*[7]

OFS_*[6]

OFS_*[5]

OFS_*[4]

OFS_*[3]

OFS_*[2]

OFS_*[1]

OFS_*[0]

R

1

R

0

R

0

R

0

R

0

R

0

R

0

R

0

www.rohm.com

2009.04 - Rev.B

8/13

Technical Note

BU21009MUV

【ECh : XY matrix setting】

Name:

Address:

POS_MODE

ECh

Description: Setting when two or more sensor are displayed to the first origin and position is detected.

XY : This selects between two matrix configurations.

1 = X axis →SIN [10 : 5] , Y axis → SIN [11:4:12:3:13:2:14:1:15:0]

0 = X axis →SIN [0 : 7] , Y axis → SIN [8:15]

POS_EN : The position tracking enable

Enables the condition under which the position tracking is made effective.

1=When either of sensor exceeds the threshold, the data of the position tracking is made effective.

If all registers do not exceed the threshold, the data of the position tracking is (POSX,POSY) = (0,0).

0=the position is detected regardless of the level of the sensor data, and data is made effective.

Initial state: When either of sensor exceeds the threshold, the positional detection data is made effective (=1).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

POS_EN

Bit0

XY

W

ECh

R/W

Initial val.

-

W

1

【EEh : Soft Calibration】

Name:

Address:

CALIB

EEh

Description: This forces a chip re-calibration when a 1 is written and returns to 0 afterward automatically. Please note

that one should always re-calibrate after changing the gain adjustment value.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

CALIB

W

EEh

R/W

Initial val.

-

0

【EFh : Setting Done, Detect Start】

Name:

Address:

DONE

EFh

Description: This register should be written to following register updates.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DONE

W

EFh

R/W

Initial val.

-

0

【F0h / F1h : Sensor Channel Setting】

Name:

Address:

SENS_CH

F0h / F1h

Description: Individual enabling and disabling of sensor channels. 1：Effective 0：Not in use

Bit7

SIN7

SIN15

W

Bit6

SIN6

SIN14

W

Bit5

SIN5

SIN13

W

Bit4

SIN4

SIN12

W

Bit3

SIN3

SIN11

W

Bit2

SIN2

SIN10

W

Bit1

SIN1

SIN9

W

Bit0

SIN0

SIN8

W

F0h

F1h

R/W

Initial val.

0

【F2h : LED Channel Setting】

Name:

Address:

Description:

LED_CH

F2h

Enables and disables the channels to be used as LED outputs. Valid for the 8 LED outputs.

1：Effective 0：Not in use

Bit7

LED7

W

Bit6

LED6

W

Bit5

LED5

W

Bit4

LED4

W

Bit3

LED3

W

Bit2

LED2

W

Bit1

LED1

W

Bit0

LED0

W

F2h

R/W

Initial val.

0

www.rohm.com

2009.04 - Rev.B

9/13

Technical Note

BU21009MUV

【F3h / F4h : Idle Exit Condition】

Name:

IDLE_CH

Address:

Description:

F3h / F4h

Defines which channels cause the device to wake up – i.e.

go from idle mode to normal operation on a key press. Selection is made on a per channel basis.

1：Effective 0：Not used

Bit7

SIN7

SIN15

W

Bit6

SIN6

SIN14

W

Bit5

SIN5

SIN13

W

Bit4

SIN4

SIN12

W

Bit3

SIN3

SIN11

W

Bit2

SIN2

SIN10

W

Bit1

SIN1

SIN9

W

Bit0

SIN0

SIN8

W

F3h

F4h

R/W

Initial val.

1

【F5h : LED to Sensor Linkage】

Name:

Address:

LED_LINK

F5h

Description: Allows the LED outputs to be automatically linked to the input channels without need for any software control.

1 : It synchronizes with the button. 0 : It synchronizes with data (The register name: DLED) from host.

Bit7

LED7

W

Bit6

LED6

W

Bit5

LED5

W

Bit4

LED4

W

Bit3

LED3

W

Bit2

LED2

W

Bit1

LED1

W

Bit0

LED0

W

F5h

R/W

Initial val.

1

【F6h : Sampling Interval】

Name:

Address:

TIMES

F6h

Description: Defines the sampling interval.

SAMP[1:0] : Sampling Interval ：

Given by the following equation :

Sampling interval = system clock x 2¹³x SAMP (Example: system clock 1[MHz] time : About 8.2[msec]).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

F6h

R/W

Initial val.

-

SAMP[1]

SAMP[0]

W

0

W

0

【F7h : Button OFF→ON Threshold】

Name:

Address:

TH_ON2

F7h

Description: A second threshold value for determining a button off→on judgment of sensor.

The sensor output value of 8bit (register SENS_DATA) is compared with 128+ ON2 [6:0],

and if it is larger, the button is determined active.

Bit7

Bit6

ON2[6]

W

Bit5

ON2[5]

W

Bit4

ON2[4]

W

Bit3

ON2[3]

W

Bit2

ON2[2]

W

Bit1

ON2[1]

W

Bit0

ON2[0]

W

F7h

R/W

Initial val.

-

0

1

0

【F8h / F9h : Button OFF→ON Threshold Selection】

Name:

Address:

TH_ON2_CH

F8h / F9h

Description: This register is used to relate either threshold TH_ON or TH_ON2 to particular sensor channels

for button press activity determination.

1 : TH_ON2 is applied 0 :TH_ON is applied

Bit7

SIN7

SIN15

W

Bit6

SIN6

SIN14

W

Bit5

SIN5

SIN13

W

Bit4

SIN4

SIN12

W

Bit3

SIN3

SIN11

W

Bit2

SIN2

SIN10

W

Bit1

SIN1

SIN9

W

Bit0

SIN0

SIN8

W

F8h

F9h

R/W

Initial val.

0

www.rohm.com

2009.04 - Rev.B

10/13

Technical Note

BU21009MUV

【FAh : Simultaneous Press and Idle Mode Entry】

Name:

Address:

Description:

CMD

FAh

INTERMIT_EN : Intermittent and the drive are enable. ：

Whether intermittent is driven at the idol mode is selected.

1：Intermittent is driven. 0：Intermittent is not driven.

Initial state：Intermittent is driven.

IDLE_T[3:0] : non-detect time-out setting ：

This sets the time the chip takes to go from normal mode to idle mode in a period key inactivity.

Duration = system clock x 2¹⁹x IDLE_T (Example of system clock 1[MHz]time : About 520[msec])

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

FAh

R/W

Initial val.

-

INTERMIT_EN IDLE_T[3]

IDLE_T[2]

IDLE_T[1]

IDLE_T[0]

W

1

W

0

W

1

W

1

W

1

【FBh : Gain Setting, Filter Function】

Name:

Address:

Description:

GAIN_FILTER

FBh

Gain adjustment and setting of noise filter function.

GAIN[2:0] : gain setting：

It uses it for the gain adjustment in eight stages. Initial adjustment value：x1

GAIN[2:0]

Adjustment value

000

x 1

001

x 4.22

010

x 8.4

011

x 16.5

100

x 23

101

x 46

110

x 69

111

x 92

FILTER_EN : Filter enable ：

Enables/disables setting of noise filter function

1 : enabled 0 : disabled Initial state : disabled

DELTA[3:0] : Filter follow count setting ：

The follow count to which the noise filter function is effective is set.

Bit7

GAIN[2]

W

Bit6

GAIN [1]

Bit5

GAIN[0]

W

Bit4

Bit3

Bit2

DELTA[2]

Bit1

DELTA[1]

Bit0

DELTA[0]

FBh

R/W

Initial val.

FILTER_EN DELTA[3]

W

0

W

0

W

0

W

0

W

1

W

0

【FCh : Switch OFF -> ON Threshold】

Name:

Address:

TH_ON

FCh

Description: This register provides a threshold value for determining if a sensor has transitioned from OFF to ON.

This is relative value from reference value (128d). So the absolute value of threshold is 128d + ON[6:0].

It makes a threshold value between TH_ON and TH_OFF.

TH_ON must be bigger than TH_OFF (TH_ON >= TH_OFF)

Maximum threshold is 256d and minimum value is 128d.

Bit7

Bit6

ON[6]

W

Bit5

ON[5]

W

Bit4

ON[4]

W

Bit3

ON[3]

W

Bit2

ON[2]

W

Bit1

ON[1]

W

Bit0

ON[0]

W

FCh

R/W

Initial val.

-

0

1

0

www.rohm.com

2009.04 - Rev.B

11/13

Technical Note

BU21009MUV

【FDh : Switch ON -> OFF Threshold Value】

Name:

Address:

TH_OFF

FDh

Description: This register provides a threshold value for transitioning from ON to OFF.

This is relative value from reference value (128d). So absolute value of threshold is128d + OFF[6:0].

It makes a threshold value between TH_ON and TH_OFF.

TH_OFF must be smaller than TH_ON (TH_OFF =< TH_ON)

Maximum value is 256d and minimum value is 128d.

Bit7

Bit6

OFF[6]

W

Bit5

OFF[5]

W

Bit4

OFF[4]

W

Bit3

OFF[3]

W

Bit2

OFF[2]

W

Bit1

OFF[1]

W

Bit0

OFF[0]

W

FDh

R/W

Initial val.

-

0

1

【FEh : LED Port Data】

Name:

Address:

DLED

FEh

Description: When LED is not linked with the sensor, it becomes a simple digital output that controls the LED.

1 : Light. 0 : Turned off.

Bit7

D7

W

Bit6

D6

W

Bit5

D5

W

Bit4

D4

W

Bit3

D3

W

Bit2

D2

W

Bit1

D1

W

Bit0

D0

W

FEh

R/W

Initial val.

0

●Operation mode

This IC has a normal mode, idle mode and a shutdown mode as states of operation.

【Normal mode】

This is the normal operation of the device. Output pin INT="L".

【Idle mode】

This is the mode when the normal mode times out due to inactivity on the keys. In this mode the control interface is still

alive.

*Usually time-out is aimed at about 200msec or less.

*Transition between normal and idle modes is automatic and without software control.

【Shutdown mode】

In this mode the device is completely stopped – and reset. This is achieved by making the terminal SDN L. All analog

circuits and the logic circuits are stopped. The return from the shutdown mode returns by making the terminal SDN H.

*After shut-down all registers have their default values.

●Interface and system clock selection

I/F selection with MODE [1:0] pin. System clock selection by RXD.

【Using 2wires serial bus mode (MODE［1:0］＝00b)】

The 2wires serial bus is used for host I/F.

RXD=0 in the system clock: Built-in oscillator is used.

RXD=1 in the system clock: The clock input from CLK_EXT is used.

●Initialization procedure

A normal power on sequence is:

(1) Power on

(2) Setup the registers

(3) Write ‘1’ to 0xEF (done register)

●Power supply turning on procedure

You should always power on DVDD at the same time as AVDD or before AVDD.

www.rohm.com

2009.04 - Rev.B

12/13

Technical Note

BU21009MUV

●Ordering part number

B

U

2

1

0

9

M U V - E

2

Part No

Package

Packaging and forming specification

MUV : VQFN032V5050

E2：Embossed tape and reel

VQFN032V5050

5.0 0.1

Tape

Embossed carrier tape

2500pcs

Quantity

E2

Direction

of feed

1PIN MARK

The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand

S

(

)

0.08

S

3.4 0.1

C0.2

1

8

9

32

16

25

24

17

0.75

Direction of feed

1pin

+0.05

0.04

0.25

0.5

-

Reel

Order quantity needs to be multiple of the minimum quantity.

(Unit : mm)

∗

www.rohm.com

2009.04 - Rev.B

13/13

Notice

N o t e s

No copying or reproduction of this document, in part or in whole, is permitted without the

consent of ROHM Co.,Ltd.

The content speciﬁed herein is subject to change for improvement without notice.

The content speciﬁed herein is for the purpose of introducing ROHM's products (hereinafter

"Products"). If you wish to use any such Product, please be sure to refer to the speciﬁcations,

which can be obtained from ROHM upon request.

Examples of application circuits, circuit constants and any other information contained herein

illustrate the standard usage and operations of the Products. The peripheral conditions must

be taken into account when designing circuits for mass production.

Great care was taken in ensuring the accuracy of the information speciﬁed in this document.

However, should you incur any damage arising from any inaccuracy or misprint of such

information, ROHM shall bear no responsibility for such damage.

The technical information speciﬁed herein is intended only to show the typical functions of and

examples of application circuits for the Products. ROHM does not grant you, explicitly or

implicitly, any license to use or exercise intellectual property or other rights held by ROHM and

other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the

use of such technical information.

The Products speciﬁed in this document are intended to be used with general-use electronic

equipment or devices (such as audio visual equipment, ofﬁce-automation equipment, commu-

nication devices, electronic appliances and amusement devices).

The Products speciﬁed in this document are not designed to be radiation tolerant.

While ROHM always makes efforts to enhance the quality and reliability of its Products, a

Product may fail or malfunction for a variety of reasons.

Please be sure to implement in your equipment using the Products safety measures to guard

against the possibility of physical injury, ﬁre or any other damage caused in the event of the

failure of any Product, such as derating, redundancy, ﬁre control and fail-safe designs. ROHM

shall bear no responsibility whatsoever for your use of any Product outside of the prescribed

scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or

system which requires an extremely high level of reliability the failure or malfunction of which

may result in a direct threat to human life or create a risk of human injury (such as a medical

instrument, transportation equipment, aerospace machinery, nuclear-reactor controller,

fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of

any of the Products for the above special purposes. If a Product is intended to be used for any

such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology speciﬁed herein that may

be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to

obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.

More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System

http://www.rohm.com/contact/

www.rohm.com

R0039

A


型号：	BU21009MUV
厂家：	ROHM
描述：	Capacitive Sensor Switch Control IC 电容式感应开关控制IC 开关
文件：	总14页 (文件大小：315K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BU21009MUV [ROHM]

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