ADM1021ARQ

Overview

The ADM1021ARQ is a low-cost microprocessor system temperature monitor manufactured by Analog Devices Inc. It functions as a two-channel digital thermometer and undertemperature/overtemperature alarm, designed for thermal monitoring and management in personal computers and similar systems. The device measures temperatures using an on-chip diode-connected PNP transistor or a discrete NPN/PNP device via a second channel. It features a two-wire serial interface compatible with SMBus standards, allowing programmable limits and alert signaling. The component operates within a supply voltage range of 3 V to 5.5 V and is housed in a small 16-lead QSOP package.

Feature Summary

• On-chip and remote temperature sensing capabilities without calibration requirements
• Two-wire SMBus serial interface supporting system management bus alert
• Programmable overtemperature and undertemperature limits

Applications

• Desktop Computers
• Notebook Computers
• Smart Batteries
• Industrial Controllers
• Telecom Equipment

Procurement Notes

Verify the specific suffix 'ARQ' against official Analog Devices documentation to confirm pinout compatibility and package type (QSOP-16). Ensure the procurement matches the exact part number to avoid confusion with variants like ADM1022 or ADM1021A. Confirm RoHS compliance status if required by your manufacturing specifications, as older batches may differ.

Selection Notes

Select this component for applications requiring accurate thermal monitoring of microprocessors and environmental temperatures. It is suitable for systems needing programmable alarm thresholds and SMBus integration. Consider the 1 C accuracy for the on-chip sensor and 3 C accuracy for the remote sensor when designing thermal protection circuits. Ensure the operating environment stays within the specified voltage and temperature ranges.

Part Context

The ADM1021 series belongs to Analog Devices' portfolio of power management and signal conditioning integrated circuits. These components are widely used in consumer electronics and industrial equipment for system health monitoring. The ADM1021 specifically addresses the need for cost-effective thermal management solutions in computing platforms, replacing discrete thermistor-based designs with a calibrated digital alternative.

Replacement Considerations

The ADM1021A is documented as an alternative to the ADM1021. Verify functional equivalence and pin compatibility before substitution. No other public substitute part numbers are confirmed.