ADM1023ARQZ-R7

Overview

The ADM1023ARQZ-R7 is a two-channel digital thermometer and under/overtemperature alarm manufactured by onsemi. It features an on-chip local sensor with ±1°C accuracy and a remote channel with 0.125°C resolution and ±1°C accuracy. The device operates on a 3 V to 5.5 V supply, drawing 200 μA during operation and 1 μA in standby. It communicates via a 2-wire SMBus interface and includes programmable temperature limits, offset registers for calibration, and an ALERT output. Packaged in a 16-lead QSOP.

Feature Summary

• Dual-channel measurement capability supporting both on-chip and external diode-connected PNP/NPN transistors
• Integrated offset registers allow system calibration to remove errors from PCB track resistance and clock noise
• SMBus compatible serial interface enables programmable conversion rates and configurable over/under temperature alarms
• Low power architecture provides distinct operating and standby modes with minimal current consumption

Applications

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

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when sourcing. Confirm the manufacturer is onsemi, as this component was formerly produced by Analog Devices or SCILLC. Ensure the QSOP-16 package matches your board layout requirements. Check for RoHS compliance status in the latest datasheet revision before finalizing procurement.

Selection Notes

Select this component for systems requiring high-accuracy thermal monitoring of microprocessors like Pentium III. Use the remote channel for discrete sensors if on-chip thermal diodes are unavailable. Consider the offset registers for precision applications where PCB trace resistance affects readings. Ensure the SMBus voltage levels match the system logic for reliable communication.

Part Context

This part belongs to the ADM1023 series of ACPI-compliant microprocessor system temperature monitors. It serves as a next-generation upgrade to the ADM1021, offering improved remote channel resolution. The device is designed specifically for personal computers and other systems needing precise thermal management and alert capabilities.

Replacement Considerations

The ADM1021 is a related predecessor but lacks the improved remote channel resolution. Verify pin compatibility and register mapping when substituting. No direct public substitute part numbers are confirmed in the provided documentation.