ADM1021AARQZ-R7

Overview

The ADM1021AARQZ-R7 is a two-channel digital thermometer and undertemperature/overtemperature alarm manufactured by onsemi. It features an on-chip sensor with ±1°C accuracy and a remote sensor channel with ±3°C typical accuracy. The device operates on a 3 V to 5.5 V supply, drawing 200 μA maximum operating current and 1 μA standby current. It utilizes a 2-wire SMBus serial interface for communication and configuration. The component is housed in a small 16-lead QSOP package.

Feature Summary

• Dual-channel temperature sensing capability using on-chip and remote sensors without calibration requirements
• Programmable overtemperature and undertemperature limits with ALERT output signaling
• SMBus compatible two-wire serial interface supporting system management bus alerts
• Low power consumption with selectable conversion rates and standby mode functionality

Applications

• Desktop computers
• Notebook computers
• Smart batteries
• Industrial controllers
• Telecom equipment

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when sourcing. Confirm the manufacturer designation as onsemi, noting the historical transition from Analog Devices or SCILLC. Ensure the QSOP-16 package matches the physical footprint requirements of the target design. Check for RoHS compliance documentation if environmental standards are mandatory for the assembly process.

Selection Notes

Select this component for systems requiring thermal monitoring of microprocessors or discrete transistors. It is suitable where SMBus integration is necessary for centralized system management. Consider the ±1°C local accuracy for internal monitoring and ±3°C remote accuracy for external components. Evaluate the 3 V to 5.5 V supply range against the system voltage rails to ensure proper operation.

Part Context

This part belongs to the ADM1021A family of low-cost microprocessor system temperature monitors. It serves as a successor to the ADM1021, offering improved noise immunity and updated register defaults. The device is designed for personal computers and other systems requiring thermal management. It replaces older analog solutions with a digital, calibrated-free approach for diode-connected PNP transistor measurements.

Replacement Considerations

The ADM1021 is pin-compatible but differs in measurement range and default register values. Verify that the absence of negative temperature measurement capability in the ADM1021A does not impact the application. Review the revision register differences (0x3x vs 0x0x) if software compatibility with legacy code is required.