ADT7476 데이터 시트보기 (PDF) - Analog Devices
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ADT7476 Datasheet PDF : 72 Pages
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADT7476
SDA 1
24 PWM1/XTO
SCL 2
23 VCCP
GND 3
22 +2.5VIN/THERM
VCC 4
VID0/GPIO0 5
VID1/GPIO1 6
VID2/GPIO2 7
21 +12VIN/VID5
ADT7476
TOP VIEW
(Not to Scale)
20 +5VIN
19 VID4/GPIO4
18 D1+
VID3/GPIO3 8
17 D1–
TACH3 9
16 D2+
PWM2/SMBALERT 10
15 D2–
TACH1 11
14 TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT
TACH2 12
13 PWM3/ADDREN
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1
SDA
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pull-up.
2
SCL
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.
3
GND
Ground Pin.
4
VCC
Power Supply. Powered by 3.3 V standby, if monitoring in low power states is required. VCC is also monitored
through this pin.
5
VID0
Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43).
GPIO0
General-Purpose Open-Drain Digital I/O.
6
VID1
Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43).
GPIO1
General-Purpose Open-Drain Digital I/O.
7
VID2
Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43).
GPIO2
General-Purpose Open-Drain Digital I/O.
8
VID3
Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43).
GPIO3
General-Purpose Open-Drain Digital I/O.
9
TACH3
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.
10
PWM2
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.
SMBALERT Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of-
limit conditions.
11
TACH1
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1.
12
TACH2
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.
13
PWM3
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.
ADDREN
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.
14
TACH4
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.
THERM
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.
SMBALERT Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of-
limit conditions.
GPIO6
General-Purpose Open-Drain Digital I/O.
ADDR SELECT If in address select mode, the logic state of this pin defines the SMBus device address.
15
D2–
Cathode Connection to Second Thermal Diode.
Rev. A | Page 7 of 72
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