Patent ID: 7521960

Claim:
A method for using a programmable system-on-a-chip including digital and analog circuits to send signals to off-chip integrated circuits in an electronic system comprising: performing a power-up sequence in the system-on-a-chip including: sensing that power supply voltage is ramping up; determining that a band-gap circuit in the system-on-a-chip is outputting correct reference voltage; determining that a first voltage regulator circuit in the system-on-a-chip is outputting correct reference voltage; determining that an FPGA circuit in the system-on-a-chip is functioning; determining that a non-volatile memory circuit in the system-on-a-chip is functioning; determining that a second voltage regulator circuit in the system-on-a-chip is outputting correct reference voltage; determining that a reference voltage to an analog-to-digital converter circuit in the system-on-a-chip is outputting correct reference voltage; calibrating the analog-to-digital converter circuit; initializing and configuring a state machine in the system-on-a-chip; and monitoring at least one condition of the electronic system.