STM690A, STM692A, STM703, STM704, STM802, STM805, STM817/8/9 are 5V supervisors with features such as automatic battery switchover and low power consumption.
The STM690A/692A/703/704/802/805/817/818/819 supervisors are self-contained devices that provide microprocessor supervisory functions. They monitor the supply voltage for out-of-tolerance conditions and force the reset output low or high accordingly. These devices also offer a watchdog timer and a power-fail comparator to provide early warning of impending power failure.
| Operating voltage | 5 V |
|---|---|
| Watchdog timer time | 1.6 sec (typ) |
| Low battery supply current | 0.4 uA (typ) |
| Low supply current | 40 uA (typ) |
| Operating temperature | -40 °C to +85 °C |
| Package types | SO8, TSSOP8 |
The internal watchdog timer runs out and triggers a reset if the input remains high or low for 1.6 seconds.
The power-fail comparator is available on most models except the STM818.
Yes, the watchdog function can be disabled by allowing the WDI pin to float.