公开(公告)号：US11972675B2

公开(公告)日：2024-04-30

申请号：US17745990

申请日：2022-05-17

Applicant: Renesas Electronics America Inc.

Inventor： Lokesh Kumath ,  Muthukumaran Chandrasekaran ,  Harley Franklin Burger, Jr.

IPC: G08B29/00 ,  G01R31/56 ,  G08B3/00

CPC classification number: G08B29/00 ,  G01R31/56 ,  G08B3/00

Abstract: In an embodiment, a semiconductor device is disclosed. The semiconductor device includes a plurality of output pins. Each of the output pins is electrically connected to an input pin of a buzzer and to a buzzer driver. The buzzer driver is configured to cause the buzzer to emit an audible sound. The semiconductor device further includes a plurality of ground switches. Each ground switch is configured to connect a corresponding output pin of the plurality of output pins to ground when closed. The semiconductor device further includes a current generator that is configured to supply a test current to a given output pin of the plurality of output pins and a clamp switch that is configured to connect the given output pin to an analog-to-digital converter.

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.