Patent ID: 8689604

Claim:
A method of testing a transducer and transducer circuitry on an integrated circuit comprising: determining if an automatic calibration test of the transducer and transducer circuitry has been run, the determining comprising reading a state of a lock bit; if a first power supply terminal and a second power supply terminal of the integrated circuit are receiving power through being directly connected to an external power supply voltage terminal and the automatic calibration test has been run, preventing further running of the automatic calibration test on the transducer and transducer circuitry; if the first power supply terminal is directly connected to the external power supply voltage terminal and the second power supply terminal is not directly connected to the power supply voltage terminal, preventing the automatic calibration test from being run; if the first power supply terminal and the second power supply terminal are receiving power through being directly connected to an external power supply voltage terminal and the automatic calibration test has not been run, running the automatic calibration test on the transducer and transducer circuitry; and after running the automatic calibration test on the transducer, storing calibration information in a non-volatile memory.