公开(公告)号：US11537114B2

公开(公告)日：2022-12-27

申请号：US17188908

申请日：2021-03-01

Applicant: Renesas Electronics America Inc.

Inventor： Lokesh Kumath ,  Muthukumaran Chandrasekaran ,  Barry Concklin ,  Bin Liu ,  Ha Chu Vu ,  Matthew Cole

IPC: G05B6/00 ,  G06F11/00 ,  G05B23/00 ,  G05B1/01 ,  G05B23/02 ,  H01S5/068

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.