ADT7468 Analog Devices, Inc., ADT7468 Datasheet - Page 6

• Manufacturer Part Number: ADT7468
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

ADT7468
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 3. Pin Function Descriptions
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Mnemonic
SDA
SCL
GND
V
VID0
VID1
VID2
VID3
TACH3
PWM2
SMBALERT
TACH1
TACH2
PWM3
TACH4
GPIO
THERM
SMBALERT
D2–
D2+
D1–
CC
Description
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires pull-up resistor.
Digital Input (Open Drain). SMBus serial clock input. Requires pull-up resistor.
Ground Pin.
Power Supply. Can be powered by 3.3 V standby, if monitoring in low power states is required. V
through this pin. The ADT7468 can also be powered from a 5 V supply. Setting Bit 7 of Configuration Register 1
(Reg. 0x40) rescales the V
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. Can be reconfigured as an analog input
(AIN3) to measure the speed of 2-wire fans.
Digital Output (Open Drain). Requires 10 kΩ typical pull-up. Pulse width modulated output to control Fan 2 speed.
Can be configured as a high or low frequency drive.
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 speed of Fan 1. Can be reconfigured as an analog input
(AIN1) to measure the speed of 2-wire fans.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be reconfigured as an analog input
(AIN2) to measure the speed of 2-wire fans.
Digital I/O (Open Drain). Pulse width modulated output to control speed of Fan 3 and Fan 4. Requires 10 kΩ typical
pull-up. Can be configured as a high or low frequency drive.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. Can be reconfigured as an analog input
(AIN4) to measure the speed of 2-wire fans.
General Purpose Open Drain Digital I/O.
Alternatively, the pin can be reconfigured as a bidirectional THERM pin. Can be used to time and monitor assertions
on the THERM input. For example, this 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 also be used as an output to signal overtemperature
conditions.
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.
PWM2/SMBALERT
CC
TACH3
TACH1
TACH2
input attenuators to correctly measure a 5 V supply.
GND
VID0
VID1
VID2
VID3
SDA
SCL
V
CC
10
11
12
1
2
3
4
5
6
7
8
9
(NOT TO SCALE)
ADT7468
Figure 3. Pin Configuration
TOP VIEW
Rev. A | Page 6 of 84
24
23
22
21
20
19
18
17
16
15
14
13
PWM1/XTO
V
+12V
+5V
VID4
D1–
D2+
D2–
TACH4/GPIO/THERM/SMBALERT
PWM3
+2.5V
D1+
CCP
IN
IN
/THERM
IN
/VID5
CC
is also monitored