ADM1023ARQZ

Overview

The ADM1023ARQZ is a two-channel digital thermometer and under/overtemperature alarm designed for microprocessor systems. It features on-chip and remote temperature sensing with 1°C accuracy on the local channel and 0.125°C resolution on the remote channel. The device supports SMBus communication, offers programmable temperature limits, and operates within a 3 V to 5.5 V supply range. Packaged in a 16-lead QSOP, it includes offset registers for calibration and low-power standby modes.

Feature Summary

• Dual-channel temperature monitoring using on-chip sensor and external diode-connected transistor
• SMBus serial interface with programmable over/under temperature alarms and ALERT output
• Offset registers for system calibration to compensate for PCB track resistance and noise errors
• Low power consumption with configurable conversion rates and standby mode functionality

Applications

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

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment against the 16-QSOP specification. Check revision history for any manufacturing changes. Ensure ESD precautions are followed during handling due to sensitivity. Validate compatibility with existing SMBus protocols before integration.

Selection Notes

Select this component when precise thermal management for Pentium III or similar processors is required. Consider the improved remote channel resolution compared to previous generations. Evaluate the need for offset calibration based on PCB layout constraints. Assess power budget requirements against the specified operating and standby currents.

Part Context

This part belongs to the ADM1023 series of high-accuracy microprocessor system temperature monitors. It serves as a next-generation upgrade to the ADM1021, offering enhanced resolution and accuracy. Manufactured by onsemi, it integrates analog-to-digital conversion and limit comparison logic into a compact surface-mount package.

Replacement Considerations

The ADM1021 is a compatible predecessor but lacks the improved remote channel resolution. Verify pinout compatibility and register mapping differences when substituting. Ensure the replacement supports the required SMBus addressing and voltage levels.