![Microprocessor Supervisors](https://d27wgn5g4t3wja.cloudfront.net/products/6b3b1c22-2e07-4249-9dc1-d6fffd82d723/435885.png)
Microprocessor Supervisors
ST’s microprocessor supervisors are more sophisticated devices that can include watchdog and early power-fail warnings (power-fail in/power-fail out (PFI/PFO)), push-button reset functions and battery monitoring. Microprocessor supervisors with a switchover function preserve SRAM data in the absence of system power by automatically switching to batter backup when power fails. A chip-enable gate automatically write-protects the SRAM when the Vcc begins to fall.