ADT7476ARQZ ON Semiconductor, ADT7476ARQZ Datasheet - Page 34

• Manufacturer Part Number: ADT7476ARQZ
• Description: IC REMOTE THERMAL CTRLR 24QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7476ARQZ

• 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: 24-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

Recommended Implementation 1
the system designer with the following features:
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Configuring the ADT7476 as shown in Figure 49 provides
Six VID inputs (VID0, VID1, VID2, VID3, VID4, and
VID6) for VRM10 support.
Two PWM outputs for fan control of up to three fans.
The front and rear chassis fans are connected in
parallel.
Three TACH fan speed measurement inputs.
V
CPU core voltage measurement (V
2.5 V measurement input used to monitor CPU current
(connected to V
controller). This is used to determine CPU power
consumption.
CC
measured internally through Pin 4.
CHASSIS
CHASSIS
COMP
FRONT
REAR
FAN
FAN
output of ADP316x VRM
TEMPERATURE
AMBIENT
CORE
Figure 49. Recommended Implementation 1
).
TACH2
PWM3
TACH3
D1+
D1–
V
+5V
+12V
CC
http://onsemi.com
IN
IN
/VID5
ADT7476A
GND
VID[0:4]/VID[0:5]
34
SMBALERT
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THERM
TACH1
PWM1
5.0 V measurement input.
VRM temperature using local temperature sensor.
CPU temperature measured using the Remote 1
temperature channel.
Ambient temperature measured through the Remote 2
temperature channel.
If not using VID5, it can be reconfigured as the 12 V
monitoring input.
Bidirectional THERM pin allows the monitoring of
PROCHOT output from an Intel P4 processor, for
example, or can be used as an overtemperature THERM
output.
SMBALERT system interrupt output.
SDA
SCL
D2+
D2–
5(VRM9)/6(VRM10)
PROCHOT
CPU FAN
ICH
CPU