ROHM BU21010MUV Technical data

Capacitive Sensor Control IC Series

Capacitive Sensor Switch
Control IC

BU21010MUV

●Description

BU21010MUV are the capacitive sensor controller with 8 channels respectively. Half of sensor ports are available to use to
LED driver. Also gesture function can recognize the short touch, long touch and finger motion.

●Features

1) Gesture function

2) LED driver

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 VQFN016V3030

●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℃)

PARAMETER SYMBOL

APPLIED VOLTAGE

INPUT VOLTAGE

STORAGE TEMPERATURE RANGE Tstg -55 125 ℃

POWER DISSIPATION Pd 215 mW

●Recommended Operating conditions

PARAMETER SYMBOL

APPLIED VOLTAGE

OPERATINGTEMPERATURE RANGE Topr -40 25 85 ℃

AVD D - 0.3 4. 5

DVDD -0.3 4.5

AIN -0.3 AVDD + 0.3

V

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.09048EBT02

UNIT

V

V

UNIT

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1/14

2009.04 - Rev.B

BU21010MUV

●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

VOLLED

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.

I

OL=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

MIN TYP MAX

0.4 1.1 2.0 MHz

RATING

UNIT Condition

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2/14

2009.04 - Rev.B

BU21010MUV

●Block Diagram, Pin configuration

AVDD DVDD

SREF

SIN[7:0]

Sensor I/F CV
translate circuit

ADC

Data corre ction and

making to format

SIN6

Technical Note

LED1

SIN2

SIN1/
LED0

LED2

SIN4

SIN5/

SIN3/

SIN7/

LED3

AVDD

DVDD

SDA

SCL

INT

SDN

SCL

SDA

SDN

Reset

generation

Conversion

sequence control

Clock

generation

CR
oscill
ation

GND

Data register

host I/F

Power

management

INT

GND

SIN0

SREF

・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 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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BU21010MUV

Technical Note

●Pin Description

Pin

No.

Name I/O Function Note

1 SDA In/Out

2 SCL In

Communication data sending and
receiving
Communication synchronous clock
input

3 INT Out Output of interrupt

4 SDN In Shutdown input

- DVDD "Hi-Z" ⑤

- DVDD - ②

"L" : Active mode
"H" : Idle mode
"L" : Halt condition
"H" : state of operation

Supply

Reference

Reset

Level

DVDD "L" ③

DVDD - ①

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

6 SIN0 AIn sensor input0 - AVDD "Hi-Z" ④

7 GND Ground Analog and digital ground - - - -

8 SIN1/LED0 AIn/Out sensor input 1 / LED control output 0

sensor input , LED drive
select

AVDD "Hi-Z" ④

9 SIN2 AIn sensor input2 - AVDD "Hi-Z" ④

10 SIN3/LED1 AIn/Out sensor input 3 / LED control output 1

sensor input , LED drive
select

AVDD "Hi-Z" ④

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

12 SIN5/LED2 AIn/Out sensor input 5 / LED control output 2

sensor input , LED drive
select

AVDD "Hi-Z" ④

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

14 SIN7/LED3 AIn/Out sensor input 7 / LED control output 3

sensor input , LED drive
select

AVDD "Hi-Z" ④

15 AVDD Power Digital part Power supply - AVDD - -

I/O Pad

16 DVDD Power Analog part Power supply - DVDD - -

●I/O Circuit

①CMOS INPUT ②CMOS Schmitt INPUT ③CMOS OUTPUT

CIN

PAD

④CMOS 3stute OUTPUT with

ANALOG-SW

PADCIN

⑤CMOS Schmitt INOUT

I

ASW

AIN

PADI

OE

CIN

PADI

OEN

PAD

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4/14

2009.04 - Rev.B

BU21010MUV

Technical Note

●HOST I/F
・ 2 wire serial, BUS

Slave mode only
Slave Address = 5Eh
Normal （Normal mode. 100kHz Transfer rate）
Fs mode (Fast mode. 400kHz Transfer rate) also.
Not adapting sequential read / write.

【Data format】

t

HD;STA

t

SU;STO

SDA

t

SU;DAT

t

HD;DAT

SCL

Address

Read

ACK

Data Data

ACK

ACK

Parameter

Standard mode High Speed mode

MIN MAX MIN MAX

fSCL : SCL Clock Freq 0 100 0 400 kHz

tHD;STA : START condition hold time 4.0 - 0.6 - μsec

tLOW : SCL “L” 4.7 - 1.3 - μsec

tHIGH : SCL “H” 4.0 - 0.6 - μsec

tHD;DAT : Data hold time 0.1 3.45 0.1 0.9 μsec

tSU;DAT : Data setup time 0.25 - 0.1 - μsec

tSU;STO : START condition hold time 4.0 - 0.6 - μsec
tBUF : Free time of bus between STOP condition and START

condition

4.7 - 1.3 - μsec

【PROTOCOL】

Unit

・Write Protocol

S SLAVE ADDRESS W

7bit = 5Eh 8bit 8bit

A

REGISTER

ADDRESS

A WRITE DATA AP

・Read Protocol

S SLAVE ADDRESS W

A

REGISTER

ADDRESS

A S SLAVE ADDRESS R A READ DATA N P

7bit = 5Eh 8bit 7bit = 5Eh 8bit

from Master to Slave S = START condition

from Slave to Master P = STOP condition

R = data direction READ (SDA HIGH)

W = data direction WRITE (SDA LOW)

A = acknowledge (SDA LOW)

N = not acknowledge (SDA HIGH)

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5/14

2009.04 - Rev.B