Patent ID: 11972675
Assignee: RENESAS ELECTRONICS AMERICA INC.
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. An apparatus comprising at least one processing device comprising hardware, the at least one processing device being configured to:
disable a buzzer driver of a detection system, the buzzer driver being connected with a buzzer via a plurality of output pins;
perform a pretest reset process, the pretest reset process comprising connecting the plurality of output pins to ground;
configure the detection system for performance of a fault test process by:
disconnecting a given output pin of the plurality of output pins from ground; and
configuring a current generator of the detection system to generate a test current;

perform the fault test process by:
activating the current generator to generate the test current;
deactivating the current generator after a predetermined amount of time;
initiating analog-to-digital conversion by an analog-to-digital converter connected to the buzzer via the given output pin to generate count values; and
storing the count values from the analog-to-digital conversion in a memory;

compare the stored count values to factory stored values corresponding to a prior performance of the fault test process;
determine, based at least in part on the comparison, that a fault condition has occurred; and
trigger an alert based at least in part on the determination that a fault condition has occurred.