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Driver Type |
Supervisor |
Min Operating Voltage (V) |
4.5 |
Max Operating Voltage (V) |
5.5 |
Nominal Reset Voltage Min |
4.37 |
Nominal Reset Voltage Max |
4.62 |
Watchdog Timer |
Yes |
Manual Reset |
Yes |
Power Fail |
No |
Min Operating Ambient Temperature (°C) |
-40 |
Max Operating Ambient Temperature (°C) |
85 |
The MIC1232 is a multifunction circuit which monitors microprocessor activity, external reset and power supplies in microprocessor based systems. The circuit functions include a watchdog time, power supply monitor, microprocessor reset, and manual pushbutton reset input.
The power supply line is monitored with a comparator and an internal voltage reference. /RST is forced low when an out-of-tolerance condition exists and remains asserted for at least 250ms after VCC rises above the threshold voltage (4.5V or 4.75V). The /RST pin will remain logic low with VCC as low as 1.4V.
The Watchdog input (/ST) monitors µP activity and will assert /RST if no µP activity has occurred with in the watchdog timeout period. The watchdog timeout period is selectable with nominal period of 150, 600, 1200 milliseconds.
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