BU21072MUV Datasheet, PDF (2/17 Pages) Rohm – Capacitive Switch Controller ICs

BU21072MUV / BU21078MUV
Datasheet
●Overview
BU21072MUV/BU21078MUV 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 3.6V 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 periodical 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 supports 36 matrix switches configured by 6x6 sensors.
●Automatic self-calibration
BU21072MUV/BU21078MUV 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 is slave device for the host device. 2-wire serial bus is compatible with I2C protocol.
Slave Address : 0x5C(BU21072MUV) , 0x5D(BU21078MUV)
●Pin Configurations
Fig.2 Pin configuration of BU21072MUV
Fig.3 Pin configuration of BU21078MUV
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TSZ02201-0Y2Y0FZ00020-1-2
12.Mar.2012 Rev.001