ADM1025ARQZ-REEL

Overview

The ADM1025ARQZ-REEL is a hardware monitor ASIC manufactured by onsemi. It provides measurement and limit comparison of system parameters via an I²C compatible SMBus interface. The device features five voltage measurement inputs for monitoring 2.5 V, 3.3 V, 5 V, and 12 V supplies, plus internal VCC monitoring. It includes one remote temperature input for external diodes and an on-chip bandgap sensor. Five digital VID inputs read processor core voltage IDs. Operating from a 3.0 V to 5.5 V supply, it offers programmable RST and INT outputs, shutdown mode, and offset configuration in a 16-lead QSOP package.

Feature Summary

• Integrated analog-to-digital conversion with sequential measurement of multiple voltage rails and temperature sensors.
• Supports processor Voltage ID (VID) reading through dedicated digital inputs with configurable pull-ups.
• Dual temperature sensing capability using both an on-chip bandgap sensor and an external diode-connected transistor.
• Configurable open-drain output pins for generating reset pulses or interrupt signals based on monitored limits.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm packaging details and revision status. Ensure compatibility with the target system's SMBus address configuration requirements before integration. Confirm that the component meets all necessary environmental certifications for the intended deployment environment.

Selection Notes

Select this component when a complete hardware monitoring solution is required for microprocessor systems without complex software overhead. Consider the ADM1025A variant if open-drain VID inputs are preferred over the internal pull-ups found in the standard ADM1025. Evaluate the need for external temperature sensing accuracy versus the convenience of the integrated local sensor.

Part Context

This part belongs to the ADM1025/ADM1025A family of low-cost PC hardware monitors. These devices were originally developed by SCILLC and later acquired by onsemi. The series is designed to replace discrete monitoring circuits, consolidating voltage and temperature supervision into a single serial bus-controlled IC for embedded systems.

Replacement Considerations

Check for direct pin-compatible alternatives within the onsemi portfolio that may offer updated revisions or different packaging options. Verify functional equivalence regarding SMBus protocol support and register mapping if substituting with other system monitor ICs.