Remote Thermal Controller and Voltage Monitor
Description
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Remote Thermal Controller and Voltage Monitor
ADT7476
The ADT7476 controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power-sensitive applications requiring active system cooling.
The ADT7476 can drive a fan using either a low or high frequency drive signal and can monitor the temperature of up to two remote sensor diodes plus its own internal temperature.
The part also measures and controls the speed of up to four fans, so the fans operate at the lowest possible speed for minimum acoustic noise.
The automatic fan speed control loop optimizes fan speed for a given temperature.
The effectiveness of the system’s thermal solution can be monitored using the THERM input.
The ADT7476 also provides critical thermal protection to the system using the bidirectional THERM pin as an output to prevent system or component overheating.
Features
• Monitors Up to Five Voltages • Controls and Monitors Up to Four Fans • High and Low Frequency Fan Drive Signal • One On-Chip and Two Remote Temperature Sensors • Extended Temperature Measurement Range Up to 191°C • Automatic Fan Speed Control Mode Controls System Cooling Based
on Measured Temperature
• Enhanced Acoustic Mode Dramatically Reduces User Perception of
Changing Fan Speeds
• Thermal Protection Feature via THERM Output • Monitors 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 • Meets SMBus 2.
0 Electrical Specifications • This Device is Pb-Free, Halogen Free and is RoHS Compliant
QSOP−24 NB CASE 492B
PIN ASSIGNMENT
SDA 1
24 PWM1/XTO
SCL 2
23 VCCP
GND 3
22 +2.
5VIN/THERM
VCC 4
21 +12VIN/VID5
VID0/GPIO0 5
20 +5VIN
VID1/GPIO1 6
19 VID4/GPIO4
ADT7476
VID2/GPIO2 7 (Top View) 18 D1+
VID3/GPIO3 8
17 D1−
TACH3 9 PWM2/
10 SMBALERT
TACH1 11
16 D2+ 15 D2− 14 *
TACH2 12
13 PWM3/ADDREN
*TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT
MARK...
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