Overview
The ADT7473/ADT7473-1 controller, produced by onsemi, is a sophisticated thermal monitor and multiple PWM fan controller designed for applications that require 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 measure 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 | 2.0 | - | - | - |
| Input Low Voltage (VIL) - TACH Inputs | V | - | - | 0.3 | - |
| Output Low Voltage (VOL) - PWM Outputs | V | 0.4 | - | - | IOUT = -8.0 mA |
| High Level Output Current (IOH) - PWM Outputs | mA | 20 | - | - | VOUT = VCC - 0.1 V |
| Clock Frequency (fSCLK) | kHz | 400 | - | 10 | - |
| Operating Temperature Range | °C | 125 | - | -40 | - |
Key Features
- Controls and monitors up to 4 fans.
- High and low frequency fan drive signal capability.
- 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 optimizes system acoustics intelligently.
- Automatic fan speed control mode 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.
- Support for 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 ADT7473/ADT7473-1 controller is primarily used as a thermal monitor and multiple PWM fan controller for noise-sensitive or power-sensitive applications.
- How many fans can the ADT7473/ADT7473-1 control?
The controller can control and monitor up to four fans.
- What types of fan drive signals does the ADT7473/ADT7473-1 support?
The controller supports both high and low frequency fan drive signals.
- How many temperature sensors does the ADT7473/ADT7473-1 have?
The controller has one on-chip temperature sensor and can monitor up to two remote temperature sensors.
- What is the extended temperature measurement range of the ADT7473/ADT7473-1?
The extended temperature measurement range is up to 191°C.
- Does the ADT7473/ADT7473-1 have thermal protection features?
Yes, it includes thermal protection features via THERM output and thermal control circuit via THERM input.
- What types of fan speed measurement does the ADT7473/ADT7473-1 support?
The controller supports both 3-wire and 4-wire fan speed measurement.
- What is the dynamic TMIN control mode in the ADT7473/ADT7473-1?
The dynamic TMIN control mode optimizes system acoustics intelligently by adjusting fan speeds based on measured temperatures.
- Is the ADT7473/ADT7473-1 suitable for noise-sensitive applications?
Yes, it includes an enhanced acoustic mode to reduce user perception of changing fan speeds, making it suitable for noise-sensitive applications.
- What are some common applications of the ADT7473/ADT7473-1?
Common applications include notebook and desktop computers, servers, game consoles, and RFID readers.
