adt7476a Analog Devices, Inc., adt7476a Datasheet - Page 6

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adt7476a

Manufacturer Part Number
adt7476a
Description
Dbcool Remote Thermal Controller And Voltage Monitor
Manufacturer
Analog Devices, Inc.
Datasheet

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ADT7476A
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
17
18
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+
D1–
D1+
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/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO 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 the speed of Fan 3 and Fan 4. Requires 10 kΩ
typical pull-up. Can be configured as a high or low frequency drive.
If pulled low on power-up, the ADT7476A enters address select mode, and the state of Pin 14 (ADDR SELECT)
determines the ADT7476A’s 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. Times and monitors assertions on the
THERM input. For example, it can be connected to the PROCHOT output of Intel’s 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.
Cathode Connection to First Thermal Diode.
Anode Connection to First Thermal Diode.
PWM2/SMBALERT
VID0/GPIO0
VID1/GPIO1
VID2/GPIO2
VID3/GPIO3
TACH3
TACH1
TACH2
GND
SDA
SCL
V
CC
10
12
11
1
2
3
4
5
6
7
8
9
ADT7476A
(Not to Scale)
TOP VIEW
Figure 3. Pin Configuration
Rev. 0 | Page 6 of 72
15
14
13
24
23
22
21
20
19
18
17
16
PWM1/XTO
V
+2.5V
+12V
+5V
VID4/GPIO4
D1+
D1–
D2+
D2–
TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT
PWM3/ADDREN
CCP
IN
IN
IN
/VID5
/THERM
CC
is also monitored

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