ADT7475ARQZ ON Semiconductor, ADT7475ARQZ Datasheet - Page 3

• Manufacturer Part Number: ADT7475ARQZ
• Description: IC REMOTE THERMAL CTRLR 16-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7475ARQZ

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 0.5 C
• Digital Output - Bus Interface: Serial (3-Wire, 4-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIN ASSIGNMENT
Pin No.
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
SMBALERT
SMBALERT
Mnemonic
THERM
TACH3
TACH1
TACH2
TACH4
PWM2
PWM3
PWM1
VCCP
GPIO
GND
VCC
SDA
SCL
XTO
D2−
D2+
D1−
D1+
B
B
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.
Ground Pin.
Power Supply. VCC is also monitored through this pin.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.
PWM2: Digital Output (Open Drain). Requires 10 kW typical pullup. Pulse−width modulated output to
control Fan 2 speed. Can be configured as a high or low frequency drive.
SMBALERT: Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt
output to signal out−of−limit conditions.
Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 1.
Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 2.
Digital I/O (Open Drain). Pulse−width modulated output to control the speed of Fan 3 and Fan 4.
Requires 10 kW typical pullup. Can be configured as a high or low frequency drive.
TACH4: Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 4.
THERM: Digital I/O (Open Drain). Alternatively, this pin can be reconfigured as a bidirectional THERM
pin that can be used to time and monitor assertions on the THERM input. For example, the pin can be
connected to the PROCHOT output of an Intel Pentium 4 processor or to the output of a trip point
temperature sensor. This pin can be used as an output to signal overtemperature conditions.
GPIO: General−Purpose Open Drain Digital I/O.
SMBALERT: Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt
output to signal out−of−limit conditions.
Cathode Connection to Second Thermal Diode.
Anode Connection to Second Thermal Diode.
Cathode Connection to First Thermal Diode.
Anode Connection to First Thermal Diode.
Analog Input. Monitors processor core voltage (0 V to 3.0 V).
Digital Output (Open Drain). Pulse−width modulated output to control Fan 1 speed. Requires 10 kW
typical pullup.
Also functions as the output from the XNOR tree in XNOR test mode.
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires 10 kW typical pullup.
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Description