公开(公告)号：US20230232165A1

公开(公告)日：2023-07-20

申请号：US18151207

申请日：2023-01-06

Applicant: STMicroelectronics S.R.I.

Inventor： Paolo Angelini ,  Roberto Pio Baorda

IPC: H04R19/04 ,  G01R19/165

CPC classification number: H04R19/04 ,  G01R19/16576 ,  H04R2201/003

Abstract: A read circuit for capacitive sensors such as a MEMS microphones includes a sensor node configured to be coupled to a capacitive sensor to apply a bias voltage to the sensor and sense the capacitance value of the sensor wherein the voltage at the sensor node is indicative of the capacitance value of the capacitive sensor. A switch is provided between the sensor node and the intermediate node. A shock detector coupled to the sensor node and the switch asserts a shock signal to make the switch conductive in response to a shock applied to the capacitive sensor, and de-asserts the shock signal to make the switch non-conductive with a delay after the end of the shock applied to the capacitive sensor.