ROHM BU21009MUV Technical data

Capacitive Sensor Control IC Series

Capacitive Sensor Switch
Control IC

BU21009MUV

●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℃)

PARAMETER SYMBOL

APPLIED VOLTAGE

INPUT VOLTAGE

STORAGE TEMPERATURE RANGE Tstg -55 125 ℃

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

PARAMETER SYMBOL

APPLIED VOLTAGE

OPERATINGTEMPERATURE RANGE Topr -40 25 85 ℃

AVD D -0. 3 4. 5

DVDD -0.3 4.5

VAIN -0.3 AVDD+0.3

VDIN -0.3 DVDD+0.3

AVDD 2.5 3.0 3.3 V

DVDD 1.7 3.0 3.3 V

MIN MAX

MIN TYP MAX

RATING

RATING

No.09048EBT03

UNIT

V

V

UNIT

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2009.04 - Rev.B

BU21009MUV

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

PARAMETER SYMBOL

H INPUT VOLTAGE VIHIO

L INPUT VOLTAGE VILIO

Output "H" voltage VOHIO

OLLED

V

Output "L" voltage

VOLTXD

VOLINT

Input leakage current IIZ

MIN TYP MAX

DVDDx0.8 - DVDD+0.3 V

DVSS-0.3

DVDD-0.7

AVSS

DVSS

DVSS

-1

RATING

-

-

-

-

-

-

UNIT Condition

DVDDx0.2 V

DVDD V

0.5

0.5

DVDDx0.3

0.5

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

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

OL=3[mA]. Undershoot is

excluded. SDA/TXD

V

application.

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

I
application.

1 μA

Technical Note

DVDD > 2[V]

DVDD ≦ 2[V]

Off leakage current IOZ

Standby current IST

Current of operation IDD

-1

-

- - 2 μA

- 300 - μA

1 μA

Shutdown (SDN＝”L”)

●A/D Converter

PARAMETER SYMBOL

MIN TYP MAX

RATING

UNIT Condition

Resolution - 10 - bit

Analog Input voltage VAIN AVSS - AVDD V
change clock frequency fadck 0.2 - 2.0 MHz
change time ftim - 77 - μsec fadck = 1[MHz]
Zero scale voltage - - AVSS+0.07 V
full scale voltage AVDD-0.07 - - V
differential Non line accurate DNL - - ±3 LSB
Integrate Non line accurate INL - - ±3 LSB

●CR Oscillator characteristic

PARAMETER SYMBOL

Frequency Oscillation

f

cr 0.4 1.1 2.0

MIN TYP MAX

RATING

UNIT Condition

MHz

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2/13

2009.04 - Rev.B

BU21009MUV

●Block Diagram, Pin configuration

AVDD DVDD

Technical Note

SDA/TXD

CLK_EXT

SCL

RXD

SDN

CS

TSTD

INT

SREF

SIN[15:0]

CS

SCL

SDA/TXD

RXD

SDN

CLK_EXT

Sensor I/F、
CV translate
circuit

Reset

generation

Power
on
Reset

Conversion

sequence control

Clock

generation

CR
oscill
ation

AVSS

ADC

Data correction and

making to format

Data register

host I/F

DVSS

Power

management

INT

MODE[1:0]

DVSS

DVDD

AVDD

SREF

SIN[0]

SIN[1]/LED[0]

SIN[2]

SIN[3]/LED[1]

MODE[1]

MODE[0]

AVSS

TSTA

SIN[15]/LED[7]

SIN[4]

SIN[13]/LED[6]

SIN[13]/LED[6]

SIN[12]

SIN[11]/LED[5]

SIN[10]

SIN[9]/LED[4]

SIN[8]

SIN[7]/LED[3]

SIN[6]

SIN[13]/LED[6]

SIN[4]

SIN[5]/LED[2]

・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.

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3/13

2009.04 - Rev.B

BU21009MUV

●Pin Description

Pin
No.

1 SIN4 AIn sensor input4 - AVDD "Hi-Z" ④

2 SIN5/LED2 AIn/Out

3 SIN6 AIn sensor input6 - AVDD "Hi-Z" ④

4 SIN7/LED3 AIn/Out

5 SIN8 AIn sensor input8 - AVDD "Hi-Z" ④

6 SIN9/LED4 AIn/Out

7 SIN10 AIn sensor input10 - AVDD "Hi-Z" ④

8 SIN11/LED5 AIn/Out

9 SIN12 AIn sensor input12 - AVDD "Hi-Z" ④

10

11 SIN14 AIn sensor input14 - AVDD "Hi-Z" ④

12

13 TSTA AIn Test input for analog block

14 AVSS Ground Analog ground - - - -

Name I/O Function Note

SIN13/LED

6

SIN15/LED

7

AIn/Out

AIn/Out

sensor input 5
/PW Drive LEDcontrol output 2

sensor input 7
/PWM Drive LED control output 3

sensor input 9
/LED control output 4

sensor input 11
/LED control output 5

sensor input 13
/LED control output 6

sensor input 15
/LED control output 7

sensor input ,
LED drive select

sensor input ,
LED drive select

sensor input ,
LED drive select

sensor input ,
LED drive select

sensor input ,
LED drive select

sensor input ,
LED drive select
NC on the substrate is
recommended.

Supply

Reference

AVDD "Hi-Z" ④

AVDD "Hi-Z" ④

AVDD "Hi-Z" ④

AVDD "Hi-Z" ④

AVDD "Hi-Z" ④

AVDD "Hi-Z" ④

AVDD "Hi-Z" ④

Technical Note

Reset

Level

I/O Pad

15 MODE[0] In Mode selection, input0

16 MODE[1] In Mode selection, input1 DVDD - ①

17 TSTD In Digital part test input Usually must be tide to "L" DVDD - ①

18 CLK_EXT In External system clock input Usually tide to"L" DVDD - ①

19 INT Out Output of interrupt

20 SDA/TXD In/Out

21 SCL In

22 RXD In

23 CS In

24 SDN In Shutdown input

25 DVSS Ground Digital part ground - - - -

26 DVDD Power Digital part Power supply - - - -

27 AVDD Power Analog part Power supply - - - ④

28 SREF AIn Standard capacitor input - AVDD "Hi-Z" ④

Communication data sending and
receiving(2wires serial)

Communication
synchronous clock input
system clock input
(2wires serial)
Slave address selection
(2wires serial mode)

00 = 2wires serial,
internal clock

"L" : Active mode
"H" : Idle mode ※2

- DVDD

- DVDD - ②

"L" : Internal clock
"H" : external clock
"L" : 5Ah
"H" : 5Bh
"L" : Halt condition
"H" : state of operation

DVDD - ①

DVDD "L" ③

"Hi-Z"

-

DVDD - ②

DVDD - ②

DVDD - -

⑤
②

29 SIN0 AIn sensor input 0 - AVDD "Hi-Z" ④

30 SIN1/LED0 AIn/Out

31 SIN2 AIn sensor input 2 - AVDD "Hi-Z" ④

32 SIN3/LED1 AIn/Out

*1 Initial State When internal organs power-on reset is effective
Halt condition SDN=”L”

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sensor input 1
/PWM Drive LEDcontrol output 0

sensor input 3
/PWM Drive LEDcontrol output 1

sensor input ,
LED drive select

sensor input ,
LED drive select

4/13

AVDD "Hi-Z" ④

AVDD "Hi-Z" ④

2009.04 - Rev.B

BU21009MUV

●I/O Circuit

①CMOS INPUT ②CMOS Schmitt INPUT ③CMOS OUTPUT

Technical Note

CIN

④CMOS 3stute OUTPUT

with ANALOG-SW

PAD

⑤CMOS Schmitt INOUT

ASW

AIN

PADI

OE

CIN

PADI

OEN

PADCIN

I

PAD

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5/13

2009.04 - Rev.B