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ADT7470ARQZ-REEL7 Arkusz danych(PDF) 7 Page - Analog Devices

Numer części ADT7470ARQZ-REEL7
Szczegółowy opis  Temperature Sensor Hub and Fan Controller
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ADT7470ARQZ-REEL7 Arkusz danych(HTML) 7 Page - Analog Devices

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ADT7470
Data Sheet
Rev. E | Page 6 of 40
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
VCC
TACH3
TACH2
TACH1
PWM2
SCL
PWM1
SMBALERT
FULL_SPEED/TMP_START
PWM4
PWM3
TACH4
ADDR
TMP_IN
SDA
ADT7470
TOP VIEW
(Not to Scale)
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SCL
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up, typically 2k2Ω.
2
GND
Ground Pin.
3
VCC
Power Supply Pin.
4
TACH3
Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 3.
5
PWM2
Digital I/O (Open Drain). Requires 10 kΩ typical pull-up. Pulse-width modulated output to control
the speed of Fan 2. Can be configured as GPIO by setting Bit 0x7F[2] = 1.
6
TACH1
Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 1.
7
TACH2
Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 2.
8
PWM3
Digital I/O (Open Drain). Pulse-width modulated output to control the speed of Fan 3.
Requires 10 kΩ typical pull-up. Can be configured as GPIO by setting Bit 0x7F[1] = 1.
9
TACH4
Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 4.
10
PWM4
Digital I/O (Open Drain). Pulse-width modulated output to control the speed of Fan 4.
Requires 10 kΩ typical pull-up. Can be configured as GPIO by setting Bit 0x7F[0] = 1.
11
ADDR
Three-state Input. Used to set the SMBus device address.
12
TMP_IN
Digital Input (Open Drain). PWM input to PWM processing engine that interprets daisy-chained output
from multiple TMP05 temperature sensors. Readings from individual TMP05 temperature sensors are
available by reading the temperature reading registers over the SMBus.
13
FULL_SPEED
Digital Input Active Low (Open Drain). This input blasts the fans to maximum speed when the pin is pulled low
externally. Do not leave pin 13 open when not I use, tie to VCC.
13
TMP_START
Digital Output (Open Drain). This pin can be used as an output to start daisy-chained temperature
measurements from TMP05 or TMP06 temperature sensors. Requires 10 kΩ typical pull-up.
14
SMBALERT
Digital Output Active Low (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output
to signal out-of-limit conditions such as fan failures.
15
PWM1
Digital I/O (Open Drain). Pulse-width modulated output to control the speed of Fan 1.
Requires 10 kΩ typical pull-up. Can be configured as GPIO by setting Bit 0x7F[3] = 1.
16
SDA
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pull-up, typically 2k2Ω.


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