ADM1021AARQ-REEL7

Overview

The ADM1021AARQ-REEL7 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 other systems. The device measures the temperature of a microprocessor using a diode-connected PNP transistor, which may be provided on-chip or as a discrete NPN/PNP device. A second measurement channel monitors the output of an on-chip temperature sensor to track the device and its environment. It communicates over a two-wire serial interface compatible with SMBus standards.

Feature Summary

• Features on-chip and remote temperature sensing capabilities without requiring calibration.
• Provides 1 degree Celsius accuracy for the on-chip sensor and 3 degrees Celsius accuracy for the remote sensor.
• Supports programmable overtemperature and undertemperature limits via the serial bus.
• Includes an ALERT output that signals when temperatures are out of the programmed range.

Applications

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

Procurement Notes

Verify the specific suffix REEL7 indicates reel packaging configuration. Confirm RoHS compliance status as documentation may vary by production batch. Ensure the QSOP-16 package matches the target PCB footprint. Validate that the operating voltage range of 3 V to 5.5 V aligns with the system design requirements before procurement.

Selection Notes

Select this component for applications requiring precise thermal management in microprocessor-based systems. It serves as an alternative to previous generations like the ADM1021. Consider the 200 mA max operating current and 1 mA standby current for power budgeting. The SMBus interface compatibility simplifies integration into existing system management architectures.

Part Context

This part belongs to the ADM1021 family of temperature monitors from Analog Devices. It is categorized under Power Management Circuits and Signal Circuits. The device is housed in a small 16-lead QSOP package, making it suitable for space-constrained electronics such as laptops and industrial controllers where efficient thermal regulation is critical.

Replacement Considerations

The ADM1021 is explicitly listed as an alternative to the ADM1021A. Verify pinout compatibility and software register mapping when substituting between these variants. Ensure the replacement supports the required SMBus alert functionality and accuracy specifications for the specific application context.