ADM1025AARQZ

Overview

The ADM1025AARQZ is a system hardware monitor ASIC manufactured by onsemi, housed in a 16-lead QSOP package. It operates within a supply voltage range of 3.0 V to 5.5 V with a typical active current of 2.5 mA and standby current of 500 μA. The device features an I²C compatible SMBus interface with a clock frequency up to 400 kHz. It provides five analog voltage inputs for monitoring 2.5 V, 3.3 V, 5 V, 12 V, and processor core voltages, alongside internal VCC monitoring. Temperature sensing includes an on-chip sensor with ±3 °C accuracy and a remote diode input with ±5 °C accuracy. The ADC resolution is 8 bits, with conversion times of 11.6 ms for analog/internal temperature and 34.8 ms for external temperature.

Feature Summary

• Supports up to eight measurement channels including five dedicated voltage inputs and two temperature sensors.
• Includes five digital VID inputs for reading processor voltage identification codes.
• Features programmable open-drain outputs for reset pulses and interrupt signaling.
• Integrates limit comparison logic for all monitored values with status register reporting.

Applications

• Network servers and personal computers
• Microprocessor-based office equipment
• Test equipment and measuring instruments

Procurement Notes

Verify component authenticity through authorized distribution channels or direct manufacturer engagement. Confirm the specific ordering suffix matches the required package and tape/reel specifications. Ensure compliance with RoHS directives and check for any product change notifications that may affect pin compatibility or electrical characteristics prior to finalizing procurement orders.

Selection Notes

Select the ADM1025A variant when open-drain VID inputs are required, as opposed to the pull-up version. Ensure the system design accommodates the 16-lead QSOP thermal dissipation requirements. Verify that the target application supports the I²C/SMBus protocol timing constraints. Consider the sequential measurement cycle time when designing real-time monitoring loops for critical voltage rails.

Part Context

This component belongs to the ADM1025 family of low-cost PC hardware monitors produced by onsemi (formerly SCILLC). It serves as a comprehensive solution for tracking power supply integrity and thermal conditions in microprocessor-based systems. The device integrates analog-to-digital conversion and serial communication interfaces into a single compact package, reducing the need for external monitoring components.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative hardware monitors from the same manufacturer only if they maintain pin compatibility and identical SMBus addressing schemes. Verify that replacement devices support the same VID input configurations and voltage ranges before implementation.