BU21008MUV_技术文档

Capacitive Sensor Control IC Series

Capacitive Sensor Switch

Control IC

BU21008MUV

No.09048EBT04

●Description

BU21008MUV are the capacitive sensor controller with 16 channels respectively. Half of sensor ports are available to use to

LED driver with PWM function. PWM function can control light ambient. Also gesture function can recognize the short touch,

long touch and finger motion.

●Features

1) Gesture function

2) LED driver with PWM 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 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

1/16

Technical Note

BU21008MUV

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

RATING

PARAMETER

SYMBOL

UNIT

Condition

MIN

TYP

MAX

DVDD+0.3

DVDDx0.2

DVDD

0.5

DVDDx0.8

DVSS-0.3

DVDD-0.7

AVSS

-

V

H INPUT VOLTAGE

L INPUT VOLTAGE

Output "H" voltage

VIHIO

VILIO

VOHIO

VOLLED

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

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

IOL=3[mA]. Undershoot is

DVDD > 2[V]

0.5

DVSS

VOLTXD

VOLINT

-

excluded. SDA/TXD

application.

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

application.

V

Output "L" voltage

DVDDx0.3

0.5

DVDD ≦2[V]

Input leakage current

Off leakage current

IIZ

-1

-

1

μA

IOZ

-

2

-

μA

Standby current

IST

IDD

Shutdown (SDN＝”L”)

Current of operation

300

●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

0.8

www.rohm.com

2009.04 - Rev.B

2/16

Technical Note

BU21008MUV

●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 software application.

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

3/16

Technical Note

BU21008MUV

●Pin Description

Supply

Reference Level

Reset

I/O

Pad

Name

No.

I/O

Function

Note

-

1

2

3

4

5

6

7

8

9

SIN4

AIn

sensor input4

AVDD

"Hi-Z"

④

sensor input 5

/PW Drive LEDcontrol output 2

sensor input , LED drive

select

SIN5/LED2 AIn/Out

SIN6

AIn

sensor input6

-

sensor input 7

/PWM Drive LED control output 3 LED drive select

sensor input ,

SIN7/LED3 AIn/Out

SIN8

AIn

sensor input8

-

sensor input 9

/LED control output 4

sensor input ,

LED drive select

SIN9/LED4 AIn/Out

SIN10

AIn

sensor input10

-

sensor input 11

/LED control output 5

sensor input ,

LED drive select

SIN11/LED5 AIn/Out

SIN12

AIn

sensor input12

-

sensor input 13

/LED control output 6

sensor input ,

LED drive select

10 SIN13/LED6 AIn/Out

11

SIN14

AIn

sensor input14

-

sensor input 15

/LED control output 7

sensor input , LED drive

select

12 SIN15/LED7 AIn/Out

NC on the substrate is

recommended.

13

TSTA

AIn

AVDD

"Hi-Z"

④

Test input for analog block

14

15

16

17

18

AVSS

MODE[0]

MODE[1]

TSTD

Ground

-

Analog ground

-

In

Mode selection, input0

Mode selection, input1

Digital part test input

External system clock input

DVDD

①

00 = 2wires serial,

internal clock

Usually must be tide to "L"

Usually tide to"L"

CLK_EXT

"L" : Active mode

"H" : Idle mode ※2

19

20

INT

Out

Output of interrupt

DVDD

"L"

③

"Hi-Z"

-

⑤

②

Communication data sending and

receiving(2wires serial)

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

Power

-

Digital part ground

-

Digital part Power supply

Power Analog part Power supply

-

④

AIn

AVDD

"Hi-Z"

Standard capacitor input

sensor input 0

sensor input 1

/PWM Drive LEDcontrol output 0

sensor input ,

LED drive select

30 SIN1/LED0 AIn/Out

AVDD

"Hi-Z"

④

31

SIN2

AIn

sensor input 2

sensor input 3

/PWM Drive LEDcontrol output 1

sensor input ,

LED drive select

32 SIN3/LED1 AIn/Out

*1 Initial State When internal organs power-on reset is effective

Halt condition SDN=”L”

www.rohm.com

2009.04 - Rev.B

4/16

Technical Note

BU21008MUV

●I/O Circuit

①CMOS INPUT

②CMOS Schmitt INPUT

③CMOS OUTPUT

I

PAD

CIN

PAD

CIN

PAD

④CMOS 3stute OUTPUT with

⑤CMOS Schmitt INOUT

ANALOG-SW

ASW

CIN

AIN

I

PAD

OEN

OE

www.rohm.com

2009.04 - Rev.B

5/16

Technical Note

BU21008MUV

●HOST I/F

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

Slave mode only

Slave Address = 5Ah,5Bh 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

STOP

START

Data

Address

ACK

Standard mode

High Speed mode

Parameter

Unit

MIN

0

MAX

100

MIN

0

MAX

400

fSCL : SCL Clock Freq

tHD;STA : START condition hold time

tLOW : SCL “L”

kHz

μsec

4.0

4.7

4.0

0.1

0.25

4.0

-

0.6

1.3

0.6

0.1

0.6

-

tHIGH : SCL “H”

tHD;DAT : Data hold time

tSU;DAT : Data setup time

tSU;STO : START condition hold time

3.45

-

0.9

-

tBUF : Free time of bus between STOP condition and

START condition

4.7

-

1.3

-

μsec

【PROTOCOL】

・Write Protocol

REGISTER

ADDRESS

S

SLAVE ADDRESS

7bit = 5Ah or 5Bh

W

A

WRITE DATA

8bit

A

P

A

8bit

・Read Protocol

REGISTER

ADDRESS

S

SLAVE ADDRESS

7bit = 5Ah or 5Bh

A

S

SLAVE ADDRESS R

READ DATA

8bit

N

P

8bit

7bit = 5Ah or 5Bh

= 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

6/16

Technical Note

BU21008MUV

●Register map

Address

Register name

SENS_DATA

R/W

R

Length

Explanation

1*h

32h, 33h

35h

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

BTN

BTN_STATE

OFFSET

R

2byte

1byte

Button On/Off.

Button state data.

4*h

R

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

60h, 61h

62h

GES_VEL

GES_DIR

FEAD_CTL

FEAD_CLK

GES_CLR

GES_CTL

GES_CLK

GES_TIMEOUT

GES_TEST

CALIB

R

2byte

1byte

2byte

1byte

2byte

1byte

Gesture duration.

R

Gesture direction.

E0h

W

PWM control setting.

PWM clock setting.

E1h

E2h

Gesture clear control.

Gesture control.

E3h

E4h

Gesture clock setting.

Gesture time-out data setting.

Gesture test function.

Soft calibration execution.

Setting done command.

Sensor channel enables.

LED channel enables.

Idle mode release control.

LED linkage to sensor input.

E5h

E6h

EEh

EFh

DONE

F0h, F1h

F2h

SENS_CH

LED_CH

F3h, F4h

F5h

IDLE_CH

LED_LINK

TIMES

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

F8h, F9h

FAh

TH_ON2

TH_ON2_CH

CMD

W

1byte

2byte

1byte

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

FEh

TH_OFF

DLED

W

1byte

Register to allow simple writing to LEDs.

www.rohm.com

2009.04 - Rev.B

7/16

Technical Note

BU21008MUV

【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

【32h / 33h : Button On/Off】

Name:

BTN

Address:

32h, 33h

Description: 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

【35h : Button State Data】

Name:

Address:

BTN_STATE

35h

Description: This provides information about the press.

CH[3:0] : Effective channel ：

This indicates which button is dominant.

SIMUL : Button effective ：

This indicates that the effective channel corresponds to a valid button press according to the thresholds.

1 : On. 0 : Off.

CONTINU : A push and hold is effective ：

Indicates that the button was pressed and held for more than push/hold judgment time. 1 : On. 0 : Off.

Bit7

CONTINU

Bit6

Bit5

Bit4

SIMUL

R

Bit3

CH[3]

R

Bit2

CH[2]

R

Bit1

CH[1]

R

Bit0

CH[0]

R

35h

R/W

Initial val.

-

R

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

【60h / 61h : Gesture Duration】

Name:

Address:

GES_VEL

60h, 61h

Description: Indicates the duration of the gesture in number of internal clocks. The count is a clock set with

0xE4(GES_CLK). It is possible to count up to 0～4095 clocks.

Gesture duration＝(gesture sampling interval) * VEL [sec]

Bit7

VEL[7]

Bit6

VEL[6]

Bit5

VEL[5]

Bit4

VEL[4]

Bit3

VEL[3]

VEL[11]

R

Bit2

VEL[2]

VEL[10]

R

Bit1

VEL[1]

VEL[9]

R

Bit0

VEL[0]

VEL[8]

R

60h

61h

R/W

-

R

0

-

R

0

-

R

0

-

R

0

Initial val.

0

www.rohm.com

2009.04 - Rev.B

8/16

Technical Note

BU21008MUV

【62h : Gesture Direction Judgment】

Name:

GES_DIR

Address:

Description:

62h

Gesture direction judgment

DIR_A : gesture direction A

0xE3(GES_CTL) reference

DIR_B : gesture direction B

0xE3(GES_CTL) reference

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

DIR_B

R

Bit0

DIR_A

R

62h

R/W

Initial val.

-

0

【E0h : PWM Control Setting】

Name:

Address:

FEAD_CTRL

E0h

Description:

EN : enable

The following LEDs can be output as PWM-LED0, LED1, LED2, and LED3.

When the LED port is used as PWM, 1 is written. LED0 = EN[0], LED 1= EN[1], LED2 = EN[2], LED3 = EN[3].

MODE : mode

The mode of PWM is selected from four kinds.

mode

MODE

Fade in

None

Fig 2

None

Fig 4

Fade out

Fig 1

Fig 3

1

2

3

4

0

1

0

1

0

1

16

14

12

10

8

14

12

10

8

6

4

2

0

2

4

6

8

10 12 14 16

0

2

4

6

8

10 12 14 16

time

Fig 1.

Fig 2.

16

14

12

10

8

16

14

12

10

8

6

4

2

0

2

4

6

8

10 12 14 16

0

2

4

6

8

10 12 14 16

time

Fig 3.

Fig 4.

Bit7

Bit6

Bit5

MODE[1]

Bit4

MODE[0]

Bit3

EN[3]

W

Bit2

EN[2]

W

Bit1

EN[1]

W

Bit0

EN[0]

W

E0h

R/W

Initial val.

-

W

0

W

0

1

www.rohm.com

2009.04 - Rev.B

9/16

Technical Note

BU21008MUV

【E1h : PWM Clock Setting】

Name:

Address:

FEAD_CLK

E1h

Description: This register defines the divide ratio of the clock used for PWM.

This also relates to the fade-in and fade-out time according to the following relationship.

Fead in/out =1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 * 16 * ( F_DIV+1 ) * 16) ) [sec]

For example with an internal clock of 1.1MHz possible range is 0.119～1.906 [sec]

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

E1h

R/W

Initial val.

-

F_DIV[3]

F_DIV[2]

F_DIV[1]

F_DIV[0]

W

0

W

1

W

1

W

1

【E2h : Gesture Clear】

Name:

Address:

GES_CLR

E2h

Description: This register when written to clears GES_VEL and GES_DIR.

It is cleared by one, and it returns to 0 by the automatic operation.

Bit7

CLR

W

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

E2h

R/W

Initial val.

-

0

【E3h : Gesture Function Setting】

Name:

Address:

GES_CTL

E3h

Description: This register controls what key-press sequence is recognized as a gesture.

Only 4 channels may be used-SIN0, SIN2, SIN4, and SIN6.

EN : enable

These are the enable bits. One is provided for each of the 4 sense inputs used for gesture. EN[0] is for SN0, EN[1] is

for SN2, EN[2] is for SN4 and EN[3] is for SN6. 1 is to enable and 0 is for disable.

MODE : mode

0 : Requires all sensors to be present in the sequence before the gesture is recognized.(All detection mode)

1 : Allows one or more of the keys to be missed in the sequence.(Verbose mode)

The condition and the direction of detection that can be detected in each mode are as follows.

mode

MODE Direction(GES_DIR)

Detected

DIR_A

DIR_B

1)SIN0→SIN2→SIN4→SIN6

1)SIN6→SIN4→SIN2→SIN0

1)SIN0→SIN2→SIN4

All detection

0

2)SIN0→SIN2→

3) SIN2→SIN4→SIN6

4)SIN0→ SIN4

5) SIN2→

SIN6

DIR_A

SIN6

Verbose

1

1)SIN6→SIN4→SIN2

2)SIN6→SIN4→

SIN0

DIR_B

3)

SIN4→SIN2→SIN0

SIN2

4)SIN6→

5)

SIN4→

SIN0

Bit7

-

Bit6

Bit5

Bit4

MODE

W

Bit3

EN[3]

W

Bit2

EN[2]

W

Bit1

EN[1]

W

Bit0

EN[0]

W

E3h

R/W

Initial val.

-

1

www.rohm.com

2009.04 - Rev.B

10/16

Technical Note

BU21008MUV

【E4h : Gesture Clock Setting】

Name:

Address:

Description:

GES_CLK

E4h

This register allows setting of the time base for the gesture detection. It sets a divide ratio of the clock used.

The maximum judgment time and the sampling interval of the gesture can be set by changing this clock.

Gesture sampling interval =

1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 1 [sec] … G_DIV = 0

1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 2 [sec] … G_DIV = 1

1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 4 [sec] … G_DIV = 2

1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 8 [sec] … G_DIV = 3

Gesture maximum judgment time＝(Gesture sampling interval) * TO * 16 [sec]

For example with an internal clock of 1.1MHz

G_DIV

Gesture sampling interval[msec]

Gesture maximum judgment time[sec]

0

1

2

3

0.46

0.93

1.86

3.72

1.90

3.81

7.62

15.2

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

E4h

R/W

Initial val.

-

G_DIV[1]

G_DIV[0]

W

1

W

0

【E5h : Gesture Timeout Data Setting】

Name:

Address:

GES_TIMEOUT

E5h

Description: The maximum judgment time of the gesture is set.

A key sequence which exceeds this time is not recognized.

Gesture Maximum Judgment Time＝(Gesture sampling interval) * TO * 16 [sec]

Bit7

TO[7]

W

Bit6

TO[6]

W

Bit5

TO[5]

W

Bit4

TO[4]

W

Bit3

TO[3]

W

Bit2

TO[2]

W

Bit1

TO[1]

W

Bit0

TO[0]

W

E5h

R/W

Initial val.

1

【E6h : Gesture Test Setting】

Name:

GES_TIMEOUT

Address:

E6h

Description: When this test bit is enabled (1) then the lower 4 bits of 0xFE(DLED) are used for the gesture recognition

instead of the sensor inputs.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

TEST

W

E6h

R/W

Initial val.

-

0

【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

www.rohm.com

2009.04 - Rev.B

11/16

Technical Note

BU21008MUV

【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:

LED_CH

F2h

Description: 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

【F3h / F4h : Idle Exit Condition】

Name:

Address:

IDLE_CH

F3h / F4h

Description: 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

www.rohm.com

2009.04 - Rev.B

12/16

Technical Note

BU21008MUV

【F6h : Sampling Interval and Number of Samples Used for Button Press】

Name:

Address:

TIMES

F6h

Description: Defines the sampling interval and number of samples required to recognise as a button press.

CONT_T[3:0] : Push and hold judgment time ：

Governs how long it is before the chip decides it is push and hold. Given by the following equation:

Push-Hold Time = system clockx2¹⁹xCONT_T (Example: system clock 1[MHz] time : About 520[msec]).

SAMP[3:0] : Sampling Interval ：

Given by the following equation:

Sampling interval = system clockx2¹³xSAMP (Example: system clock 1[MHz] time : About 8.2[msec]).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

F6h

R/W

Initial val.

CONT_T[3] CONT_T[2] CONT_T[1] CONT_T[0] SAMP[3]

SAMP[2]

SAMP[1]

SAMP[0]

W

0

W

0

W

0

W

0

W

0

W

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

【FAh : Simultaneous Press and Idle Mode Entry】

Name:

Address:

Description:

CMD

FAh

SIMUL_SEL : Simultaneous push judgment element choice ：

In the case of simultaneous key press a decision must be made to select the dominant channel. The chip allows for two

alternative methods. Either it can be based on whichever key press was first, or the priority can be based on the highest

signal level.

1 : A level of a sensor gives priority

0 : Give priority to the channel pushed earliest

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.

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

Initial state：Intermittent is driven.

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

Duration = system clockx2¹⁹xIDLE_T (Example of system clock 1[MHz]time : About 520[msec])

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

FAh

R/W

Initial val.

SIMUL_SEL

-

INTERMIT_EN IDLE_T[3]

IDLE_T[2]

IDLE_T[1]

IDLE_T[0]

W

0

W

1

W

0

W

1

W

1

W

1

www.rohm.com

2009.04 - Rev.B

13/16

Technical Note

BU21008MUV

【FBh : Gain Setting, Filter Function】

Name:

Address:

GAIN_FILTER

FBh

Description: 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

【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 is 128d+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

www.rohm.com

2009.04 - Rev.B

14/16

Technical Note

BU21008MUV

●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

15/16

Technical Note

BU21008MUV

●Ordering part number

B

U

2

1

0

8

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

16/16

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：	BU21008MUV
厂家：	ROHM
描述：	Capacitive Sensor Switch Control IC 电容式感应开关控制IC 开关消费电路商用集成电路
文件：	总17页 (文件大小：678K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BU21008MUV [ROHM]

相关型号：

BU21008MUV-E2

BU21009MUV

BU21010MUV

BU21010MUV-E2

BU21018MWV

BU21021GUL

BU21021GUL-E2

BU21023FV-ME2

BU21023GUL

BU21023GUL-E2

BU21023GUL-ME2

BU21023GUL_11