ADT7476 Analog Devices, Inc., ADT7476 Datasheet - Page 7

• Manufacturer Part Number: ADT7476
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
SDA
SCL
GND
V
VID0
GPIO0
VID1
GPIO1
VID2
GPIO2
VID3
GPIO3
TACH3
PWM2
SMBALERT
TACH1
TACH2
PWM3
ADDREN
TACH4
THERM
SMBALERT
GPIO6
ADDR SELECT
D2–
D2+
CC
Description
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pull-up.
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.
Ground Pin.
Power Supply. Powered by 3.3 V standby, if monitoring in low power states is required. V
through this pin.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID code register (0x43).
General-Purpose Open-Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID code register (0x43).
General-Purpose Open-Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID code register (0x43).
General-Purpose Open-Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID code register (0x43).
General-Purpose Open-Drain Digital I/O.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.
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.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.
Digital I/O (Open Drain). Pulse-width modulated output to control Fan 3 and Fan 4 speed. Requires 10 kΩ typical
pull-up. Can be configured as a high or low frequency drive.
If pulled low on power-up, the ADT7476 enters address select mode, and the state of Pin 14 (ADDR SELECT)
determines the ADT7476 slave address.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.
Alternatively, the pin can be reconfigured as a bidirectional THERM pin. Use to time and monitor assertions on
the THERM input. For example, can be connected to the PROCHOT output of an Intel® Pentium® 4 processor or
to the output of a trip point temperature sensor. Can 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.
General-Purpose Open-Drain Digital I/O.
If in address select mode, the logic state of this pin defines the SMBus device address.
Cathode Connection to Second Thermal Diode.
Anode Connection to Second Thermal Diode.
PWM2/SMBALERT
VID0/GPIO0
VID1/GPIO1
VID2/GPIO2
VID3/GPIO3
TACH3
TACH1
TACH2
GND
SDA
SCL
V
CC
10
11
12
1
2
3
4
5
6
7
8
9
(Not to Scale)
ADT7476
TOP VIEW
Figure 3. Pin Configuration
Rev. B | Page 7 of 72
24
23
22
21
20
19
18
17
16
15
14
13
PWM1/XTO
V
+12V
+5V
VID4/GPIO4
D1–
D2+
D2–
TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT
PWM3/ADDREN
+2.5V
D1+
CCP
IN
IN
IN
/VID5
/THERM
CC
is also monitored
ADT7476