Analog Devices AN612 Application Notes
AN-612
APPLICATION NOTE
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/326-8703 • www.analog.com
ADT7463 Confi gurations
by Mary Burke
INTRODUCTION
This document is intended as a supplement to the
ADT7463 data sheet. Since many of the pins on the
ADT7463 are multifunctional, there are many possible
confi gurations of the ADT7463. The purpose of this document is to describe all the possible options and their
confi guration register settings.
RECOMMENDED IMPLEMENTATION
Confi guring the ADT7463 as in Figure 2 provides the systems designer with the following features:
1. Six VID Inputs (VID0 to VID5) for VRM10 Support.
2. Two PWM Outputs for Fan Control of up to
Three Fans (the front and rear chassis fans are connected in parallel).
3. Three TACH Fan Speed Measurement Inputs.
FRONT
CHASSIS
FAN
TACH2
ADT7463
4. V
5. CPU Core Voltage Measurement (V
Measured Internally through Pin 4.
CC
CORE
).
6. 2.5 V Measurement Input Used to Monitor CPU
Current (connected to V
output of ADP316x VRM
COMP
controller). This is used to determine CPU power
consumption.
7. 5 V Measurement Input.
8. VRM temperature uses local temperature sensor.
9. CPU Temperature Measured Using Remote 1
Temperature Channel.
10. Ambient Temperature Measured through Remote 2
Temperature Channel.
11. If not using VID5, this pin can be reconfi gured as the
+12 V monitoring input.
12. Bidirectional THERM Pin. Allows Intel
®
Pentium 4®
PROCHOT monitoring and can function as an overtemperature THERM output.
13. SMBALERT System Interrupt Output.
PWM1
TACH1
REV. 0
REAR
CHASSIS
FAN
AMBIENT
TEMPERATURE
CONTROLLER
PWM3
VID[0:4]/VID[0:5]
D2+
D2–
THERM
SDA
SCL
SMBALERT
GND
ADP316x
VRM
V
COMP
TACH3
D1+
D1–
3.3VSB
5V
12V/VID5
CURRENT
V
CORE
Figure 1. Recommended Implementation
5(VRM9)/6(VRM10)
PROCHOT
AN-612
CONFIGURATION OPTION 1
Confi guring the ADT7463 as in Figure 2 provides the systems designer with the following features:
1. Six VID Inputs (VID0 to VID5) for VRM10 Support.
Enabling VID5 also enables the VID code change
detect feature.
2. Three PWM Outputs for Fan Control of up to Four
Fans (PWM1 to PWM3).
3. Four TACH Fan Speed Measurement Inputs.
4. V
Measured Internally through Pin 4.
CC
5. CPU Core Voltage Measurement (V
6. SMBALERT Interrupt Output.
7. Bidirectional THERM Pin. Allows P4 PROCHOT
monitoring and can function as an overtemperature
THERM output.
8. Two Remote Diode Temperature Measurements.
CONFIGURING THE ADT7463 FOR CONFIGURATION 1
The following bits need to be confi gured for the recommended pinout:
CCP
).
PWM1/XTO
SDA
SCL
GND
V
VID0
VID1
VID2
VID3
TACH3
PWM2
TACH1
TACH2
CC
1
2
3
4
5
ADT7463
6
TOP VIEW
(Not to Scale)
7
8
9
10
11
12
24
23
V
CCP
22
SMBALERT
21
VID5
20
THERM
19
VID4
18
D1+
17
D1–
D2+
16
15
D2–
14
TACH4/ADDRESS SELECT
13
PWM3/ADDRESS ENABLE
Figure 2. Recommended Pinout Option
Register
VID Register (0x43)
Confi guration Register 4 (0x7D)
Confi guration Register 3 (0x78)
Confi guration Register 4 (0x7D)
Bit Setting
<7> VIDSEL = 1
<0> AL2.5V = 1
<1> Therm Timer = 1
Function Selected
Confi gures Pin 21 as the VID5 input
Confi gures Pin 22 as the SMBALERT output
Enables the THERM monitoring function
<1> TH5V = 1 Confi gures Pin 20 as the bidirectional THERM pin
–2–
REV. 0
AN-612
CONFIGURATION OPTION 2
PWM1/XTO
Confi guring the ADT7463 as in Figure 3 provides the
systems designer with the following features:
1. Five VID Inputs (VID0 to VID4) for VRM9.x Support.
2. Two PWM Outputs for Fan Control (PWM1 and
PWM3).
3. Three TACH Fan Speed Measurement Inputs.
4. V
5. CPU Core Voltage Measurement (V
Measured Internally through Pin 4.
CC
CCP
).
6. 2.5 V Measurement Input.
7. 12 V Measurement Input.
8. 5 V Measurement Input.
9. Two Remote Diode Temperature Measurements.
SDA
SCL
GND
V
VID0
VID1
VID2
VID3
TACH3
SMBALERT
TACH1
TACH2
1
2
3
4
CC
5
ADT7463
6
TOP VIEW
(Not to Scale)
7
8
9
10
11
12
Figure 3. Pinout Option 2
24
23
V
CCP
22
2.5V
21
12V
20
5V
19
VID4
18
D1+
17
D1–
D2+
16
15
D2–
14
ADDRESS SELECT/THERM
13
PWM3/ADDRESS ENABLE
10. SMBALERT Interrupt Output.
11 . Bidirectional THERM Pin. Allows Intel P4 PROCHOT
monitoring and can function as an overtemperature
THERM output.
CONFIGURING THE ADT7463 FOR PINOUT OPTION 2
The following bits need to be confi gured for Pinout Option 2:
Register Bit Setting Function Selected
VID Register (0x43) <7> VIDSEL = 0 Confi gures Pin 21 as the 12 V input
Confi guration Register 3 (0x78) <0> ALERT = 1 Confi gures Pin 10 as SMBALERT output
Confi guration Register 3 (0x78) <1> Therm Timer = 1 Enables THERM monitoring on Pin 14
Confi guration Register 4 (0x7D) <0> AL2.5V = 0 Confi gures Pin 22 as 2.5 V input
Confi guration Register 4 (0x7D) <1> TH5V = 0 Confi gures Pin 20 as 5 V input
REV. 0
–3–
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