Overview
The ADT7473/ADT7473-1, produced by onsemi, 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 is capable of driving fans using either low or high frequency drive signals and can monitor the temperature of up to two remote sensor diodes in addition to its own internal temperature. It also measures and controls the speed of up to four fans to minimize acoustic noise and optimize system acoustics.
Key Specifications
| Parameter | Unit | Max | Typ | Min | Conditions |
|---|---|---|---|---|---|
| Operating Temperature Range | °C | 125 | -40 | ||
| Temperature Accuracy | °C | ±2.5 | |||
| Clock Frequency (fSCLK) | kHz | 400 | 10 | ||
| Input High Voltage (VIH) for TACH Inputs | V | 3.6 | 2.0 | ||
| Input Low Voltage (VIL) for TACH Inputs | V | 0.8 | -0.3 | ||
| Output Low Voltage (VOL) for PWM Outputs | V | 0.4 | IOUT = -8.0 mA | ||
| High Level Output Current (IOH) for PWM Outputs | μA | 20 | VOUT = VCC - 0.1 |
Key Features
- Supports both internal and external temperature sensing with a wide temperature range from -40°C to 125°C.
- High temperature accuracy of ±2.5°C.
- Drives fans using either low or high frequency drive signals.
- Monitors and controls the speed of up to four fans to minimize acoustic noise.
- Dynamic TMIN control mode optimizes system acoustics intelligently.
- Automatic fan speed control mode based on measured temperature.
- Enhanced acoustic mode reduces user perception of changing fan speeds.
- Thermal protection feature via THERM output and thermal control circuit via THERM input.
- Meets SMBus 2.0 electrical specifications and is fully SMBus 1.1 compliant.
- Lead-free and RoHS compliant.
Applications
- Notebook and desktop computers.
- Servers.
- Game consoles.
- RFID readers.
Q & A
- What is the primary function of the ADT7473/ADT7473-1?
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 up to four fans.
- What is the temperature range for the ADT7473/ADT7473-1?
The temperature range is from -40°C to 125°C.
- What is the temperature accuracy of the ADT7473/ADT7473-1?
The temperature accuracy is ±2.5°C.
- Does the ADT7473/ADT7473-1 support SMBus?
Yes, it meets SMBus 2.0 electrical specifications and is fully SMBus 1.1 compliant.
- Is the ADT7473/ADT7473-1 RoHS compliant?
Yes, it is lead-free and RoHS compliant).
- What types of fan drive signals does the ADT7473/ADT7473-1 support?
It supports both low and high frequency fan drive signals).
- How does the ADT7473/ADT7473-1 optimize system acoustics?
It uses dynamic TMIN control mode and enhanced acoustic mode to optimize system acoustics).
- What is the purpose of the THERM output and input on the ADT7473/ADT7473-1?
The THERM output provides thermal protection, and the THERM input allows for thermal control).
- What types of applications is the ADT7473/ADT7473-1 typically used in?
It is typically used in notebook and desktop computers, servers, game consoles, and RFID readers).
