ADM1025ARQZ-REEL7

Overview

The ADM1025ARQZ-REEL7 is a low-cost system hardware monitor ASIC designed for microprocessor-based environments. It provides up to eight measurement channels, including five analog inputs for monitoring supply voltages (2.5 V, 3.3 V, 5 V, 12 V) and the processor core voltage. The device features an on-chip temperature sensor and supports external remote diode sensing. It communicates via an I²C-compatible System Management Bus with a programmable address. Key electrical parameters include a supply voltage range of 3.0 V to 5.5 V, a typical active supply current of 2.5 mA, and a standby current of 500 μA. The internal ADC offers 8-bit resolution with a total unadjusted error of ±2%.

Feature Summary

• Integrated hardware monitoring capabilities for multiple power rails and thermal conditions
• Supports both internal bandgap sensing and external remote diode temperature measurement
• Configurable digital outputs for reset pulses or interrupt signaling based on limit comparisons
• I²C compatible serial interface allowing full control and data retrieval via SMBus

Applications

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

Procurement Notes

Verify that the ordering suffix matches the specific package variant required for your PCB layout. Confirm the manufacturer designation as ON Semiconductor, noting the historical transition from Analog Devices. Ensure the component meets RoHS compliance standards if applicable to your manufacturing process. Cross-reference the datasheet revision to confirm pinout consistency before finalizing procurement orders.

Selection Notes

Select this component when a comprehensive hardware monitoring solution is needed for multi-voltage systems. Consider the ADM1025A variant if open-drain VID inputs are preferred over the pull-up configuration found in the standard ADM1025. Evaluate the need for external versus internal temperature sensing based on board layout constraints. Verify that the I²C bus speed requirements align with the device's 400 kHz clock frequency specification.

Part Context

This part belongs to the ADM1025 family of system hardware monitors produced by ON Semiconductor. It serves as a dedicated ASIC for tracking critical system parameters in computing environments. The device integrates analog-to-digital conversion and limit comparison logic to simplify system management design. It replaces discrete monitoring circuits with a single integrated solution.

Replacement Considerations

Check for direct replacements within the ADM1025/ADM1025A family. Verify register compatibility if substituting with other hardware monitor ICs. Ensure the replacement supports the same I²C addressing scheme and voltage input ranges.