The ADM1021A1 is a two-channel digital thermometer and undertemperature/overtemperature alarm, intended for use in personal computers and other systems requiring thermal monitoring and management. The device integrates a temperature sensor on-chip, eliminating the need for an external temperature sensor. The ADM1021A1 uses a 2-wire SMBus serial interface and supports system management bus (SMBus) alert.
The ADM1021A is a two‑channel digital thermometer and over/under‑temperature alarm designed for personal computers, industrial controllers, and other systems that require thermal monitoring. It measures on‑chip temperature via a diode‑connected transistor and remote temperature via an external sensor, providing 1 °C resolution without calibration.
The device communicates over a two‑wire SMBus serial interface, allowing programmable temperature limits, conversion rates, and alert output. The datasheet includes electrical specifications, pin descriptions, typical performance curves, and an ordering guide for the 16‑lead QSOP package.
| Supply Voltage Range | 3.0 V to 3.6 V |
|---|---|
| Temperature Resolution | 1 °C |
| Temperature Error, Local Sensor | +1 °C |
| SMBus Clock Frequency | 100 kHz |
| Conversion Time | 65 ms to 170 ms |
The device operates from 3.0 V to 3.6 V.
It provides two temperature channels – one on‑chip and one remote.
It uses a two‑wire SMBus serial interface compatible with SMBus standards.