公开(公告)号：US20200249465A1

公开(公告)日：2020-08-06

申请号：US16855301

申请日：2020-04-22

Applicant: STMicroelectronics Ltd

Inventor： Sivan KINSTLICH ,  Offir DUVDEVANY

IPC: G02B26/08

Abstract: Mirror control circuitry operates to control a movable mirror. The mirror control circuitry includes drive circuitry for providing a drive signal to the movable mirror, and a processor. The processor causes the drive circuitry to generate the drive signal so as to have pulses with leading edges occurring an offset period of time after a maximum opening angle of the movable mirror and trailing edges occurring an offset period of time before a zero crossing of the movable mirror. The processor may sample a mirror sense signal from the movable mirror at times at which a derivative of capacitance of the movable mirror with respect to time is zero, and then perform an action based upon the samples.

公开(公告)号：US20200301127A1

公开(公告)日：2020-09-24

申请号：US16897491

申请日：2020-06-10

Applicant: STMicroelectronics LTD

Inventor： Elik HARAN ,  Offir DUVDEVANY ,  Naomi PETRUSHEVSKY

IPC: G02B26/08 ,  G01R19/04 ,  H02P25/032 ,  G02B26/10

Abstract: An electronic device includes an analog to digital converter receiving an analog mirror sense signal from an oscillating mirror and generating a digital mirror sense signal therefrom, and a digital signal processing block. The digital signal processing block cooperates with the analog to digital converter to take a first sample of the digital mirror sense signal at a first time where a derivative of capacitance of the digital mirror sense signal crosses zero, take a second sample of the digital mirror sense signal at a second time between a peak of the digital mirror sense signal and the first time, and take a third sample of the digital mirror sense signal at a third time after the digital mirror sense signal has reached a minimum. Control circuitry determines an opening angle of the oscillating mirror as a function of the first, second, and third samples.