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TDC1000-TDC7200EVM: TDC1000/VCOM voltage is shut down

THINH Nguyen
Prodigy 150 points

Part Number: TDC1000-TDC7200EVM

Hi TI team,

My customer make a Ultrasonic wind sensor product. they are designed this board same as TDC1000-GASEVM : http://www.ti.com/tool/TDC1000-GASEVM?keyMatch=TDC1000-GASEVM&tisearch=Search-EN-Everything

they are used internal TDC1000 VCOM (VDD/2 = 1.8V). however, VCOM voltage is shut down after we receive the receiver signal about 400us same as picture below. Why do VCOM voltage shut down?


 

Thanks.

Thinh

Ultrasonic