ADM1030ARQZ

Overview

The ADM1030ARQZ is an ACPI-compliant intelligent temperature monitor and PWM fan controller designed for microprocessor-based systems. It features a two-channel digital thermometer with ±1°C accuracy for remote diode sensors and ±1°C to ±3°C for the internal sensor, offering 0.125°C resolution on the remote channel and 0.25°C on the local channel. The device includes a programmable PWM output for fan speed control, tachometer input for RPM measurement, and analog input capability for 2-wire fans. Communication occurs via a 2-wire SMBus with ARA support, operating within a 3 V to 5.5 V supply range in a 16-lead QSOP package.

Feature Summary

• Integrates dual temperature sensing channels with high-resolution ADCs for precise thermal monitoring of local and remote components.
• Provides autonomous fan speed regulation through a dedicated control loop that adjusts PWM duty cycles based on temperature thresholds without CPU intervention.
• Supports comprehensive fan diagnostics including tachometer counting, stall detection, and analog speed measurement via sense resistors.
• Features fail-safe hardware outputs such as THERM for overtemperature throttling and FAN_FAULT for immediate alert signaling.

Applications

• Notebook PCs
• Network Servers
• Personal Computers
• Telecommunications Equipment

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to discontinued status. Confirm RoHS compliance and lead-free packaging specifications against current inventory records. Ensure proper handling procedures are followed as the device is moisture sensitive. Validate pin compatibility and electrical characteristics against original design requirements before integration.

Selection Notes

Select this component for systems requiring ACPI-compliant thermal management with independent fan control capabilities. Suitable for designs needing precise remote temperature monitoring using external diodes or transistors. Ideal for applications where acoustic noise reduction and battery life optimization are critical through automatic fan speed adjustment. Consider availability constraints given the product's discontinued status.

Part Context

The ADM1030 series serves as a specialized thermal management solution for Pentium III and subsequent microprocessor architectures. Manufactured by onsemi, it replaces legacy analog monitoring circuits with digital precision. The device integrates multiple functions into a single IC, reducing board space and component count while improving system reliability through automated thermal protection mechanisms.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

How does the ADM1030 handle fan speed control if the CPU locks up?

The device features a dedicated Fan Speed Control Loop that operates independently of CPU software. If the system locks up, the ADM1030 continues to monitor temperatures and adjust fan speeds automatically to prevent overheating.

What is the purpose of the ADD pin on the ADM1030?

The ADD pin is a three-state logic input used to set the two least significant bits of the SMBus slave address. This allows up to three different addresses to be configured at power-up, preventing address conflicts when multiple devices share the same bus.

Can the ADM1030 measure the speed of a 2-wire fan?

Yes, the TACH/AIN pin can be reprogrammed as an analog input. By connecting a sense resistor, the device can measure the voltage drop across it to determine the speed of a 2-wire fan.