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ADT7468 Datasheet(PDF) 11 Page - Analog Devices

Part # ADT7468
Description  dBCool??Remote Thermal Controller and Voltage Monitor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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ADT7468
Rev. 0 | Page 11 of 80
Bit 1
= 0 is the high frequency (22.5 kHz) fan drive signal.
Bit 1
= 1 switches the fan drive to low frequency PWM,
programmable between 10 Hz and 100 Hz, the same as the
ADT7463. The default = 0 = HF PWM.
Bit 2
sets the direction for the GPIO: 0 = input, 1 = output.
Bit 3
sets the GPIO polarity: 0 = active low, 1 = active high.
HOW TO SET THE FUNCTIONALITY OF PIN 14
Pin 14 on the ADT7468 has four possible functions:
SMBALERT, THERM, GPIO, and TACH4. The user chooses the
required functionality by setting Bit 0 and Bit 1 of Configura-
tion Register 4 at Address 0x7D.
Table 4. Pin 14 Settings
Bit 0
Bit 1
Function
00
TACH4
01
THERM
10
SMBALERT
11
GPIO
RECOMMENDED IMPLEMENTATION
Configuring the ADT7468 as in Figure 15 allows the system
designer to use the following features:
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.
VCC measured internally through Pin 3.
CPU temperature measured using Remote 1 temperature
channel.
Ambient temperature measured through Remote 2
temperature channel.
Bidirectional THERM pin. This feature allows Intel
Pentium 4 PROCHOT monitoring and can function as an
overtemperature THERM output. It can alternatively be
programmed as an SMBALERT system interrupt output.
TACH2
PWM3
TACH3
D1+
D1–
3.3VSB
5V
12V/VID5
CURRENT
VCORE
GND
ADT7468
SCL
SDA
D2+
D2–
TACH1
VID[0:4]/VID[0:5]
PWM1
AMBIENT
TEMPERATURE
SMBALERT
THERM
FRONT
CHASSIS
FAN
REAR
CHASSIS
FAN
5(VRM9)/6(VRM10)
ADP316x
VRM
CONTROLLER
VCOMP
PROCHOT
CPU FAN
CPU
ICH
Figure 15. ADT7468 Configuration


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