dBCool® Remote Thermal Monitor and Fan Controller ADT7473 controls and monitors up to 4 fans with high and low frequency fan drive signal. It has 1 on-chip and 2 remote temperature sensors with series resistance cancellation on the remote channel. It provides extended temperature measurement range up to 191°C, dynamic TMIN control mode to optimize system acoustics intelligently, automatic fan speed control mode to control system cooling based on measured temperature, enhanced acoustic mode to dramatically reduce user perception of changing fan speeds, thermal protection feature via THERM output, monitoring performance impact of Intel® Pentium®4 processor, thermal control circuit via THERM input, 3-wire and 4-wire fan speed measurement, limit comparison of all monitored values, and meets SMBus 2.0 electrical specifications (fully SMBus 1.1 compliant). It is fully ROHS compliant.
The ADT7473 dBCool® controller provides active system cooling for noise‑sensitive or power‑sensitive applications. It can drive up to four fans with low‑ or high‑frequency PWM signals, monitor one on‑chip temperature sensor and two remote diode sensors, and adjust fan speed automatically to maintain the lowest acoustic noise.
The device communicates via an SMBus‑compatible serial interface (SMBus 1.1/2.0) and includes a bidirectional THERM pin for thermal protection and system‑level temperature monitoring. It is fully ROHS compliant and offered in a 16‑lead QSOP package.
| Supply Voltage | 3.0 V (min) – 3.6 V (max) |
|---|---|
| Supply Current | 15 µA (typ) |
| Local Sensor Accuracy | ±0.5 °C |
| Resolution (Temperature) | 0.25 °C |
| Input High Voltage (digital inputs) | 2.0 V |
| Input Low Voltage (digital inputs) | 0.8 V |
| PWM Output Current Sink | 8.0 mA |
| SMBus Clock Frequency | 10 kHz – 400 kHz |
| Maximum Junction Temperature | 150 °C |
| Positive Supply Voltage (VCC) Rating | 3.6 V |
It can control and monitor up to four fans.
It includes one on‑chip temperature sensor and supports two remote diode temperature sensors.
The device uses an SMBus interface and meets SMBus 2.0 (fully SMBus 1.1 compliant) specifications.
The recommended supply voltage is 3.0 V to 3.6 V.