ADT7490 Series

Remote Thermal Monitor and Fan Controller with PECI Interface

Catalog

Remote Thermal Monitor and Fan Controller with PECI Interface

Part	Output Type	Output Alarm	Function	Output Fan	Topology	Accuracy	Sensing Temperature [Max]	Sensing Temperature [Min]	Supplier Device Package	Sensor Type	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case [custom]	Voltage - Supply [Max]	Voltage - Supply [Min]	Mounting Type
ON Semiconductor ADT7490ARQZ-REEL	SMBus		Fan Control Temp Monitor		ADC Comparator Fan Speed Counter Multiplexer Register Bank	2.5 °C	125 °C	-40 °C	24-QSOP	Internal and External	125 °C	-40 °C	24-SSOP	0.154 " 3.9 mm	3.6 V	3 V	Surface Mount

Catalog

Remote Thermal Monitor and Fan Controller with PECI Interface

Key Features

• 1 local on-chip temperature sensor

• 2 remote temperature sensors

• 3-current external temperature sensors with series resistance cancellation (SRC)

• PECI interface for CPU thermal information and support of up to 4 PECI inputs on one pin

• 3 high frequency or low frequency PWM outputs for use with 3-wire or 4-wire fans

• 4 TACH inputs to measure fan speed

• OS independent automatic fan speed control based on thermal information

• Dynamic TMINcontrol mode to optimize system acoustics

• Default startup at 100% PWM for all fans for robust operation

Description

The ADT7490 is a thermal monitor and multiple PWM fan controller for noise-sensitive or power-sensitive applications requiring active system cooling. The ADT7490 includes a local temperature sensor, two remote temperature sensors including series resistance cancellation, and monitors CPU temperature with a PECI interface. The ADT7490 can drive a fan using either a low or high frequency drive signal, and measure and control the speed of up to four fans so they operate at the lowest possible speed for minimum acoustic noise.