ADT7476 Remote Thermal Controller and Voltage Monitor 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 www.onsemi.com 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 QSOP24 NB for a given temperature. The effectiveness of the systems thermal CASE 492B 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 PIN ASSIGNMENT component overheating. 1 24 SDA PWM1/XTO Features 2 SCL 23 V CCP Monitors Up to Five Voltages GND 3 22 +2.5V /THERM IN Controls and Monitors Up to Four Fans V 4 21 +12V /VID5 CC IN High and Low Frequency Fan Drive Signal VID0/GPIO0 5 20 +5V IN One On-Chip and Two Remote Temperature Sensors VID1/GPIO1 6 19 VID4/GPIO4 ADT7476 Extended Temperature Measurement Range Up to 191C VID2/GPIO2 7 18 D1+ (Top View) Automatic Fan Speed Control Mode Controls System Cooling Based VID3/GPIO3 8 17 D1 on Measured Temperature TACH3 9 16 D2+ PWM2/ Enhanced Acoustic Mode Dramatically Reduces User Perception of 10 15 D2 SMBALERT Changing Fan Speeds 11 TACH1 14 * Thermal Protection Feature via THERM Output TACH2 12 13 PWM3/ADDREN Monitors Performance Impact of Intel Pentium 4 Processor *TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT Thermal Control Circuit via THERM Input 3-wire and 4-wire Fan Speed Measurement Limit Comparison of All Monitored Values MARKING DIAGRAMS Meets SMBus 2.0 Electrical Specifications This Device is Pb-Free, Halogen Free and is RoHS Compliant ADT7476RQZ YYWW xxxx ADT7476RQZ = Specific Device Code = Pb-Free Package YYWW = Date Code xxxx = Assembly Lot Code ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 67 of this data sheet. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: February, 2016 Rev. 10 ADT7476/DADT7476 ADDR SELECT ADDREN SCL SDA SMBALERT VID5/GPIO5 ADT7476 VID4/GPIO4 SMBus VID3/GPIO3 SERIAL BUS VID/GPIO ADDRESS VID2/GPIO2 INTERFACE REGISTER SELECTION VID1/GPIO1 VID0/GPIO0 ADDRESS GPIO6 POINTER REGISTER PWM1 PWM REGISTERS AUTOMATIC PWM2 AND CONTROLLERS FAN SPEED PWM (HF AND LF) CONTROL PWM3 CONFIGURATION REGISTERS TACH1 TACH2 FAN SPEED INTERRUPT COUNTER TACH3 MASKING TACH4 PERFORMANCE MONITORING THERMAL THERM INTERRUPT PROTECTION STATUS V TO ADT7476 CC REGISTERS ACOUSTIC V CC ENHANCEMENT D1+ CONTROL LIMIT D1 COMPARATORS INPUT D2+ SIGNAL 10-BIT D2 CONDITIONING ADC +5V IN VALUE AND AND +12V LIMIT IN ANALOG REGISTERS +2.5V MULTIPLEXER IN BAND GAP V CCP REFERENCE BAND GAP TEMP. SENSOR GND Figure 1. Functional Block Diagram Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit Positive Supply Voltage (V ) 3.6 V CC Maximum Voltage on +12 V Pin 16 V IN Maximum Voltage on +5.0 V Pin 6.25 V IN Maximum Voltage on All Open-Drain Outputs 3.6 V Input Current at Any Pin 5 mA Package Input Current 20 mA Maximum Junction Temperature (T ) 150 C J MAX Storage Temperature Range 65 to +150 C Lead Temperature, Soldering C IR Reflow Peak Temperature 220 Pb-Free Peak Temperature 260 Lead Temperature (Soldering, 10 sec) 300 ESD Rating 1,500 V Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. NOTE: This device is ESD sensitive. Use standard ESD precautions when handling. www.onsemi.com 2