ADT7475ARQZ データシートの表示（PDF） - Analog Devices
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ADT7475ARQZ Datasheet PDF : 68 Pages
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ADT7475
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
SCL 1
GND 2
VCC 3
TACH3 4
PWM2/SMBALERT 5
TACH1 6
TACH2 7
PWM3 8
16 SDA
ADT7475
TOP VIEW
(Not to Scale)
15 PWM1/XTO
14 VCCP
13 D1+
12 D1–
11 D2+
10 D2–
9 TACH4/THERM/GPIO/SMBALERT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic
Description
1
SCL
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.
2
GND
Ground Pin.
3
VCC
4
TACH3
Power Supply. VCC is also monitored through this pin.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.
5
PWM2/SMBALERT 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.
6
TACH1
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1.
7
TACH2
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.
8
PWM3
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.
9
TACH4/THERM/
TACH4: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.
GPIO/SMBALERT GPIO: General-Purpose Open Drain Digital I/O.
THERM: Digital I/O (Open Drain). Alternatively, this pin can be reconfigured as a bidirectional THERM pin
that can be used to time and monitor assertions on the THERM input. For example, the 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 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.
10
D2−
Cathode Connection to Second Thermal Diode.
11
D2+
Anode Connection to Second Thermal Diode.
12
D1−
Cathode Connection to First Thermal Diode.
13
D1+
Anode Connection to First Thermal Diode.
14
VCCP
15
PWM1
Analog Input. Monitors processor core voltage (0 V to 3 V).
Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 kΩ
typical pull-up.
XTO
Also functions as the output from the XNOR tree in XNOR test mode.
16
SDA
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires 10 kΩ typical pull-up.
Rev. A | Page 6 of 68
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