The ADM1232 is a high performance microprocessor monitoring circuit that can monitor the microprocessor supply voltage, whether the microprocessor is locked-up and an external interrupt. The ADM1232 comes in four packages and is suitable for various applications.
The ADM1232 is a pin‑compatible upgrade for the MAX1232 and DS1232 families, providing microprocessor supply‑voltage monitoring, lock‑up detection, and external interrupt handling. It is available in four packages (ARM, AN, ARW, ARN) and requires no external components.
Key features include selectable voltage‑trip points (4.5 V or 4.75 V), adjustable strobe timeout, push‑button reset with debounce, and both active‑high and open‑drain reset outputs. The device operates from a 4.5 V to 5.5 V supply and consumes less than 500 µA.
| Supply Voltage Range | 4.5 V to 5.5 V |
|---|---|
| Input High Level (STROBE, TOLERANCE) | 2.0 V |
| Input Low Level (STROBE, TOLERANCE) | -0.3 V to +0.8 V |
| Reset Output Current | 8 mA to 10 mA |
| 5 % Trip Point (Typical) | 4.5 V |
Connect the TOLERANCE pin to GND for a 5 % tolerance (trip at ~4.75 V) or to VCC for a 10 % tolerance (trip at ~4.5 V).