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BU21072MUV Datasheet(PDF) 2 Page - Rohm |
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BU21072MUV Datasheet(HTML) 2 Page - Rohm |
2 / 17 page 2/14 Datasheet Datasheet BU21072MUV / BU21078MUV TSZ02201-0Y2Y0FZ00020-1-2 © 2012 ROHM Co., Ltd. All rights reserved. 12.Mar.2012 Rev.001 www.rohm.com TSZ22111・15・001 ● 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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