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ADT7476A Dataheets PDF



Part Number ADT7476A
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Remote Thermal Controller and Voltage Monitor
Datasheet ADT7476A DatasheetADT7476A Datasheet (PDF)

DATA SHEET www.onsemi.com Remote Thermal Controller and Voltage Monitor ADT7476A The ADT7476A controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power-sensitive applications requiring active system cooling. The ADT7476A 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 fa.

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DATA SHEET www.onsemi.com Remote Thermal Controller and Voltage Monitor ADT7476A The ADT7476A controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power-sensitive applications requiring active system cooling. The ADT7476A 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 ADT7476A 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 • Improved TACH and PWM Performance • 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 • 5.0 V Support on all TACH and PWM Channels • 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 GND 3 VCC 4 VID0/GPIO0 5 VID1/GPIO1 6 VID2/GPIO2 7 VID3/GPIO3 8 ADT7476A (Top View) 23 VCCP 22 +2.5VIN/THERM 21 +12VIN/VID5 20 +5VIN 19 VID4/GPIO4 18 D1+ 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 MARKING DIAGRAMS ADT7476AARQZ #YYWW xxxx ADT7476AARQZ = 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 68 of this data sheet. © Semiconductor Components Industries, LLC, 2016 1 May, 2022 − Rev. 8 Publication Order Number: ADT7476A/D VID5/GPIO5 VID4/GPIO4 VID3/GPIO3 VID2/GPIO2 VID1/GPIO1 VID0/GPIO0 GPIO6 PWM1 PWM2 PWM3 TACH1 TACH2 TACH3 TACH4 THERM VCC D1+ D1− D2+ D2− +5VIN +12VIN +2.5VIN VCCP ADT7476A ADDR ADDREN SELECT SCL SDA SMBALERT ADT7476A VID/GPIO REGISTER SMBus ADDRESS SELECTION PWM REGISTERS AND CONTROLLERS (HF AND LF) AUTOMATIC FAN SPEED CONTROL FAN SPEED COUNTER SERIAL BUS INTERFACE ADDRESS POINTER REGISTER PWM CONFIGURATION REGISTERS INTERRUPT MASKING VCC TO ADT7476A BAND GAP TEMP. SENSOR PERFORMANCE MONITORING THERMAL PROTECTION INPUT SIGNAL CONDITIONING AND ANALOG MULTIPLEXER ACOUSTIC ENHANCEMENT CONTROL 10-BIT ADC BAND GAP REFERENCE INTERRUPT STATUS REGISTERS LIMIT COMPARATORS VALUE AND LIMIT REGISTERS GND Figure 1. Functional Block Diagram SCL SDA tBUF P S t LOW tR tHD; STA tHD; DAT tF tHIGH tSU; DAT t HD; STA tSU; STA S Figure 2. Serial Bus Timing Diagram tSU; STO P www.onsemi.com 2 ADT7476A Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit Positive Supply Voltage (VCC) Maximum Voltage on +12VIN Pin Maximum Voltage on +5.0VIN Pin Maximum Voltage on SDA, SCL, THERM (Pin 22) and GPIO1−5 Pins Maximum Voltage on all Tach and PWM Pins Voltage on Remaining Input or Output Pins Input Current at Any Pin Package Input Current Maximum Junction Temperature (TJ MAX) Storage Temperature Range Lead Temperature, Soldering IR Reflow Peak Temperature Pb-Free Peak Temperature Lead Temperature (Soldering, 10 sec) 3.6 V 16 V 6.25 V 3.6 V +5.5 V −0.3 to +4.2 V ±5 mA ±20 mA 150 °C −65 to +150 °C °C 220 260 300 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. Table 2. THERMAL CHARACTERISTICS (Note 1) Package Type qJA qJC 24-lead QSOP 122 31.25 1. JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 3. ELECTRICAL CHARACTERISTICS (TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted) (Note 1) Parameter Conditions Power Supply Supply Voltage Supply Current, ICC Temperature-to-Digital Converter Interface Inactive, ADC Active Local Sensor Accuracy Resolution 0°C ≤ TA ≤ 85°C −40°C ≤ TA ≤ 125°C Remote Diode Sensor Accuracy Resolution 0°C.


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