ADM1021ARQZ-REEL

Overview

The ADM1021ARQZ-REEL is a dual-channel digital temperature monitor manufactured by onsemi, housed in a 16-lead QSOP package. It features an on-chip sensor with ±1°C accuracy and a remote channel with ±3°C accuracy. The device operates on a 3V to 5.5V supply, supports SMBus communication, and includes programmable over/under-temperature alarms.

Feature Summary

• Dual-channel monitoring for local and remote thermal sensing
• Calibration-free measurement using novel voltage cancellation technique
• SMBus compatible serial interface with alert support

Applications

• Desktop computer system monitoring
• Notebook computer thermal management
• Industrial controller temperature supervision

Procurement Notes

Verify the manufacturer designation carefully as this part number appears in catalogs from both Analog Devices and onsemi due to historical corporate acquisition. Confirm the specific datasheet revision and pinout compatibility with your existing design before procurement, as legacy documentation may vary between sources.

Selection Notes

Select this component when a low-cost, two-wire serial interface is required for microprocessor-based systems. It is suitable for applications needing simultaneous monitoring of processor junction temperature and ambient board temperature without external calibration components.

Part Context

This device belongs to the ADM1021 family of low-cost microprocessor system temperature monitors. It serves as a dedicated hardware solution for thermal management in personal computers and industrial equipment, replacing discrete thermistor circuits with integrated digital monitoring capabilities.

Replacement Considerations

The ADM1023 is documented as the next-generation upgrade product for the ADM1021 series. Verify pin-to-pin compatibility and register mapping differences if migrating from this discontinued or legacy part.