US 11,972,675 B2
In-situ silent fault detection for buzzers
Lokesh Kumath, Cary, NC (US); Muthukumaran Chandrasekaran, San Jose, CA (US); and Harley Franklin Burger, Jr., San Jose, CA (US)
Assigned to Renesas Electronics America Inc., Milpitas, CA (US)
Filed by Renesas Electronics America Inc., Milpitas, CA (US)
Filed on May 17, 2022, as Appl. No. 17/745,990.
Prior Publication US 2023/0419818 A1, Dec. 28, 2023
Int. Cl. G08B 29/00 (2006.01); G01R 31/56 (2020.01); G08B 3/00 (2006.01)
CPC G08B 29/00 (2013.01) [G01R 31/56 (2020.01); G08B 3/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A semiconductor device comprising:
a plurality of output pins, each of the output pins being electrically connected to an input pin of a buzzer and to a buzzer driver, the buzzer driver being configured to cause the buzzer to emit an audible sound;
a plurality of ground switches, each ground switch being configured to connect a corresponding output pin of the plurality of output pins to ground when closed;
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.