Matthew R Cole

US Patent:

20220276646, Sep 1, 2022

Filed:

Mar 1, 2021

Appl. No.:

17/188908

Inventors:

- Milpitas CA, US
Muthukumaran CHANDRASEKARAN - San Jose CA, US
Berry CONCKLIN - San Jose CA, US
Bin LIU - Santa Clara CA, US
Ha Chu VU - San Jose CA, US
Matthew COLE - Los Altos CA, US

Assignee:

Renesas Electronics America Inc. - Milpitas CA

International Classification:

G05B 23/02
H01S 5/068

Abstract:

Example implementations include a method of pre-bootup fault monitor of a LASER diode driver output, by applying a first power to a pre-bootup fault monitor device, setting a fault condition at the pre-bootup fault monitor device to a no-fault state, initiating the pre-bootup fault monitor device, determining whether a first impedance of driver output satisfies an impedance threshold, and in response to a determination that the first impedance satisfies the impedance threshold, applying a second power to the output device. Example implementations also include a system with a LASER output device, and a pre-bootup fault monitor device operatively coupled to the LASER output device, and operable to activate in response to receiving a first power, set a fault condition to a no-fault state, determine whether a first impedance of the output driver satisfies an impedance threshold, and, in response to a determination that the first impedance satisfies the impedance threshold, apply a second power to the LASER output device, and a power-on reset controller operatively coupled to the pre-bootup fault monitor and operable to, in response to the determination that the first impedance satisfies the impedance threshold, deactivate the pre-bootup fault monitor.