BU21072MUV_16 Datasheet, PDF (2/40 Pages) Rohm – Capacitive Switch Controller ICs

BU21072MUV / BU21078MUV / BU21078FV
OVERVIEW
BU21072MUV/BU21078MUV/BU21078FV is a capacitive sensor controller for switch operation.
Included blocks are AFE (Analog Front End) detecting capacitance, A/D converter, MPU, LED ports with PWM function,
2-wire serial bus interface compatible with I2C protocol, power-on-reset, oscillator. Operate with a 3.0 to 5.5V single power
supply.
The results that detected switch operations (Touch/Release/Hold) are held to each register. An interrupt is send from INT
port to the host when a register is updated by detected operations. If external noise and temperature drift are detected, run
automatic self-calibration. Without periodic polling, offer the reduction of the host load.
LED ports are able to be applied PWM function. PWM function offers fade-in / fade-out brightness control.
Simple switch
One sensor is assigned to one switch. Each simple switch has the registers of detected Touch/Release/Hold operations.
Simple switches support to multi-detect Touch/Release/Hold. Unused simple switches are maskable.
Matrix switches
The cross points of the sensors which are arranged in a matrix are able to assigned to individual switches. Each matrix
switch has the registers of detected Touch/Release/Hold operations. Matrix switches do not support to multi-detect
Touch/Release/Hold. Not used matrix switches are maskable. BU21072MUV supports 16 matrix switches configured by
4x4 sensors, and BU21078MUV / BU21078FV supports 36 matrix switches configured by 6x6 sensors.
Automatic self-calibration
BU21072MUV/BU21078MUV/BU21078FV has observed the situation surrounding the sensor based on the detection
result. If external noise and temperature drift are detected, the automatic self-calibration is operated for the stable
detection result.
LED controller with PWM timers
LED controller is High active. Each LED port is assigned to a choice of four PWM timers. If the situation surrounding the
sensor is changed by the switching LED, it is useable that calibration is operated by sending LED control command.
Host interface
BU21072MUV/BU21078MUV/BU21078FV is slave device for the host device. 2-wire serial bus is compatible with I2C
protocol.
Slave Address : 0x5C(BU21072MUV) , 0x5D(BU21078MUV / BU21078FV)
Pin Configurations
18
13
12
19
SIN9
INT
SIN8
SDA
SIN7 _BU21072MUV SCL
SIN6
SIN5
TOP VIEW
TEST
VSS
SIN4
DVDD
24
1
7
6
Figure 2. Pin configuration
(BU21072MUV)
21
15
22
SIN7
SIN6
SIN13
SIN5
SIN14
SIN4
SIN3
28
BU21078MUV
TOP VIEW
14
LED0
INT
SDA
SCL
TEST
VSS
DVDD
8
1
7
Figure 3. Pin configuration
(BU21078MUV)
LED5
LED6
LED7
SIN7
SIN6
SIN13
SIN5
SIN14
SIN4
SIN3
SIN12
SIN2
SIN11
SIN1
1
28
BU21078FV
TOP VIEW
14
15
LED4
LED3
LED2
LED1
LED0
INT
SDA
SCL
TEST
VSS
DVDD
VDD
AVDD
SIN0
Figure 4. Pin configuration
(BU21078FV)
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TSZ02201-0L5L0F300640-1-2
14.Jul.2016 Rev.004