Overview
The ADM1031ARQZ-REEL, produced by onsemi, is an ACPI-compliant, three-channel digital thermometer and under/overtemperature alarm designed for use in personal computers and thermal management systems. This device is optimized for systems such as those using the Pentium III processor, offering high accuracy and the ability to safely reduce temperature guard-banding, thereby increasing system performance. It also features dual PWM fan control outputs, allowing for the smooth control of two cooling fans based on temperature measurements.
Key Specifications
| Parameter | Unit | Max | Typ | Min | Test Conditions/Comments |
|---|---|---|---|---|---|
| Sensor Accuracy (Local) | °C | - | - | ±1 | - |
| Sensor Accuracy (Remote Diode1) | °C | - | - | ±0.5 (60°C ≤ TD ≤ 100°C) | - |
| Sensor Accuracy (Remote Diode2) | °C | - | - | ±0.5 (60°C ≤ TD ≤ 100°C) | - |
| Resolution | °C | - | - | 0.125 | - |
| Remote Sensor Source Current (High Level) | μA | - | 180 | - | - |
| Remote Sensor Source Current (Low Level) | μA | - | 11 | - | - |
| Output Low Voltage (OPEN-DRAIN DIGITAL OUTPUTS) | V | - | - | 0.4 (IOUT = –6.0 mA; VCC = 3.0 V) | - |
| High-Level Output Leakage Current | μA | 1.0 | - | 0.1 (VOUT = VCC; VCC = 3.0 V) | - |
| Clock Frequency (fSCLK) | kHz | 100 | - | 10 | - |
Key Features
- ACPI-compliant three-channel digital thermometer and under/overtemperature alarm.
- Dual PWM fan control outputs with duty cycle values between 33% and 100% for smooth fan control.
- TACH inputs for monitoring fan speed, which can be reprogrammed as analog inputs for 2-wire fans.
- Dedicated fan speed control loop without CPU software intervention.
- Support for Alert Response Address (ARA) and serial System Management Bus (SMBus) communication.
- Internal registers for configuration, address pointer, and status monitoring.
Applications
The ADM1031ARQZ-REEL is primarily used in personal computers and thermal management systems. It is particularly suitable for systems requiring precise temperature monitoring and fan control, such as:
- Personal computers and laptops.
- Server systems and data centers.
- Industrial control systems.
- Other microprocessor-based systems needing thermal management.
Q & A
- What is the primary function of the ADM1031ARQZ-REEL? The primary function is to serve as an intelligent temperature monitor and dual PWM fan controller.
- What is the accuracy of the local temperature sensor? The local temperature sensor accuracy is ±1°C.
- How many channels does the ADM1031ARQZ-REEL support for temperature monitoring? It supports three channels for temperature monitoring.
- What is the range of duty cycle values for the PWM fan control outputs? The duty cycle values range from 33% to 100%.
- Can the TACH inputs be reprogrammed? Yes, the TACH inputs can be reprogrammed as analog inputs to measure speeds for 2-wire fans.
- Does the ADM1031ARQZ-REEL require CPU software intervention for fan control? No, it has a dedicated fan speed control loop that operates without CPU software intervention.
- What communication protocol does the ADM1031ARQZ-REEL use? It uses the serial System Management Bus (SMBus) protocol.
- What is the clock frequency range for the SMBus communication? The clock frequency range is from 10 kHz to 100 kHz.
- Can the ADM1031ARQZ-REEL detect a stalled fan? Yes, it can detect a stalled fan.
- What are some common applications of the ADM1031ARQZ-REEL? Common applications include personal computers, server systems, industrial control systems, and other microprocessor-based systems requiring thermal management.
