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BU21078MUV Arkusz danych(PDF) 4 Page - Rohm |
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BU21078MUV Arkusz danych(HTML) 4 Page - Rohm |
4 / 17 page 4/14 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 ● Block Diagram ● Description of Blocks ●Sensor AFE, C/V Converter Convert from capacitance to voltage following the order of sensors. ●A/D Convert from voltage to the detected result the digital value. ●LDO28 2.73V output LDO for Sensor AFE, C/V Converter and A/D. ●LDO15 1.5V output LDO for OSC and digital blocks. ●OSC Ring oscillator as the system clock. ●POR Power-On-Reset monitoring VDD as the system reset. ●MPU Based on the detection result, detect switch operations (Touch/Release/Hold) and run Auto-calibration. Inform by the INT port to the host about that the switch operations are detected. Control LED ports by the commands from the host. ●PROM Program ROM for the included MPU. ●WRAM Work RAM for the included MPU. ●HOST I/F 2-wire serial bus interface compatible with I2C protocol. ●AFE_CNT Sequencer of Sensor AFE, C/V converter and A/D. ●PWM_CNT PWM timers for the LED ports. ●LEDDRV LED port drivers. ●WDTR Watchdog Timer Reset. It releases the system reset after 1 sec from that MPU cannot clear WDTR. (If MPU cannot clear WDTR, MPU is hang-up.) Fig.7 Block Diagram |
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