This document introduces the function and features of the ADM1232 microprocessor monitoring circuit, including voltage monitoring, reset generator, timer, etc.
The ADM1232 is a microprocessor supervisory circuit that monitors supply voltage, lock‑up conditions, and external interrupts. It is pin‑compatible with MAX1232 and Dallas DS1232 devices and operates from –40 °C to +85 °C.
Key features include selectable 4.5 V or 4.75 V monitoring options, adjustable strobe timeout (150 ms, 600 ms, 1.2 s), and no external components required. The device is offered in four packages (MSOP, PDIP, wide‑SOIC, narrow‑SOIC) and provides reset and watchdog functions with configurable tolerance inputs.
| Operating Temperature Range | -40°C to +85°C |
|---|---|
| Supply Voltage Range | 4.5 V to 5.5 V |
| Input High Level | 2.0 VCC + 0.3 V |
| Input Low Level | -0.3 V to +0.8 V |
| Reset Output Current | 8 mA to 10 mA |
The device can operate at 4.5 V, 5.0 V, or 5.5 V supply voltages.
PB RESET must be held low for a minimum of 20 ms to guarantee a reset.
Connecting TOLERANCE to GND selects a –5 % trip point (4.75 V), while connecting it to VCC selects a –10 % trip point (4.5 V).
The ADM1232 is offered in four packages: 8‑lead MSOP (RM‑8), 8‑lead PDIP (N‑8), 16‑lead wide SOIC (RW‑16), and 8‑lead narrow SOIC (R‑8).