Overview
The ADT7473/ADT7473-1 controller, specifically the ADT7473ARQZ-RL7, is a sophisticated thermal monitor and multiple PWM fan controller designed for applications requiring active system cooling, particularly in noise-sensitive or power-sensitive environments. This controller can drive fans using either low or high frequency drive signals, monitor the temperature of up to two remote sensor diodes along with its own internal temperature, and control the speed of up to four fans to minimize acoustic noise.
Key Specifications
| Parameter | Unit | Max | Typ | Min | Conditions |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | V | 3.6 | - | 2.7 | - |
| Input High Voltage (VIH) - TACH Inputs | V | 3.6 | - | 2.0 | - |
| Input Low Voltage (VIL) - TACH Inputs | V | 0.8 | - | -0.3 | - |
| Output Low Voltage (VOL) - PWM Outputs | V | 0.4 | - | - | IOUT = -8.0 mA |
| Output High Voltage (VOH) - PWM Outputs | V | 0.75 * VCC | - | - | - |
| Clock Frequency (fSCLK) | kHz | 400 | - | 10 | - |
| Temperature Range | °C | 125 | - | -40 | - |
| Remote Temperature Measurement Range | °C | 191 | - | -64.8 | - |
Key Features
- Controls and monitors up to 4 fans
- High and low frequency fan drive signal
- 1 on-chip and 2 remote temperature sensors with series resistance cancellation on the remote channel
- Extended temperature measurement range up to 191°C
- Dynamic TMIN control mode to optimize system acoustics
- Automatic fan speed control based on measured temperature
- Enhanced acoustic mode to reduce user perception of changing fan speeds
- Thermal protection feature via THERM output and thermal control circuit via THERM input
- 3-wire and 4-wire fan speed measurement
Applications
- Notebook and Desktop Computers
- Servers
- Game Consoles
- RFID Readers
Q & A
- What is the primary function of the ADT7473/ADT7473-1 controller? The primary function is to monitor temperature and control fan speeds in noise-sensitive or power-sensitive applications.
- How many fans can the ADT7473/ADT7473-1 control? It can control and monitor up to 4 fans.
- What types of fan drive signals does the ADT7473/ADT7473-1 support? It supports both high and low frequency fan drive signals.
- What is the temperature measurement range of the remote sensors? The remote sensors can measure temperatures up to 191°C.
- Does the ADT7473/ADT7473-1 have thermal protection features? Yes, it includes thermal protection via THERM output and thermal control circuit via THERM input.
- How does the dynamic TMIN control mode work? It optimizes system acoustics by intelligently controlling fan speeds based on measured temperatures.
- What is the enhanced acoustic mode? This mode dramatically reduces the user's perception of changing fan speeds.
- Can the ADT7473/ADT7473-1 measure fan speed using different wire configurations? Yes, it supports both 3-wire and 4-wire fan speed measurement.
- What are some common applications for the ADT7473/ADT7473-1? Common applications include notebook and desktop computers, servers, game consoles, and RFID readers.
- What is the supply voltage range for the ADT7473/ADT7473-1? The supply voltage range is from 2.7V to 3.6V.
