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BU21051FS Scheda tecnica(PDF) 3 Page - Rohm |
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BU21051FS Scheda tecnica(HTML) 3 Page - Rohm |
3 / 7 page BU21051FS Technical Note 3/6 www.rohm.com 2009.04 - Rev.B © 2009 ROHM Co., Ltd. All rights reserved. ● Block Diagram, Pin configuration ● Sensor I/F CV Conversion Circuit: This part selects target sensor and converts its capacitance to a voltage signal. Specifically, alleight sensors are selected one-by-one and their capacity is compared to a common referencecapacity. Each difference value is converted to a certain voltage signal. ・ AD Conversion The voltage signal derived from CV conversion is further converted to digital value by this block. ・ Conversion Sequence Control This block controls the process of CV conversion and generates timing of selecting target sensors. ・ Noise Filter The GND level difference between appliance and human body will cause noises to the CV conversion ・ Compare threshold CV converted to sensor data On / Off compared with a threshold, the switch converts the signal. ・ Calibration When the capacitance change do not exceed the threshold for a certain period, this blockstarts-up calibration process. ・ Reset Generation This is internal reset circuit. Reset is initialized by external SDN signal. ・ Clock Generation Clock from internal RC oscillation circuit is used as system clock. |
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Descrizione simile - BU21051FS |
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