ADT7466 查看數據表（PDF） - Analog Devices
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ADT7466 Datasheet PDF : 48 Pages
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
DRIVE1 1
16 SCL
TACH1 2
15 SDA
DRIVE2 3
14 ALERT
ADT7466
TACH2 4
13 REFOUT
TOP VIEW
GND 5 (Not to Scale) 12 AIN2/TH2/D2+
VCC 6
FAN1_ON/PROCHOT/THERM 7
11 AIN1/TH1/D2–
10 D1+
FANLOCK 8
9 D1–
Figure 3. Pin Configuration
ADT7466
Table 3. Pin Function Descriptions
Pin No. Mnemonic
Type
1
DRIVE1
Analog
Output
2
TACH1
Digital
Input
3
DRIVE2
Analog
Output
4
TACH2
Digital
Input
5
GND
Ground
6
VCC
Power
supply
7
FAN1_ON/ PROCHOT/ Digital I/O
THERM
8
FANLOCK
9
D1−
10
D1+
11
AIN1/TH1/D2−
12
AIN2(TH2)/D2+
13
REFOUT
14
ALERT
15
SDA
16
SCL
Digital
Output
Analog
Input
Analog
Input
Analog
input
Analog
Input
Analog
Output
Digital
Output
Digital I/O
Digital
Input
Description
Output of 8-Bit DAC Controlling Fan 1 Speed.
Fan Tachometer Input to Measure Speed of Fan 1.
Output of 8-Bit DAC Controlling Fan 2 Speed.
Fan Tachometer Input to Measure Speed of Fan 2.
Ground Pin for Analog and Digital Circuitry.
3.3 V Power Supply. VCC is also monitored through this pin.
If configured as FAN1_ON, this pin is the open-drain control signal output for the dc-dc
converter. Active (high) when DRIVE1 > V_FAN_MIN.
If configured as PROCHOT, the input can be connected to the PROCHOT output of the
Intel Pentium 4 processor to time and monitor PROCHOT assertions.
If configured as THERM, this pin is the interrupt output to flag critical thermal events.
Open-Drain Digital Output. This output is asserted (low) when either of the fans stall or
fail to spin up.
Cathode Connection to Thermal Diode 1.
Anode Connection to Thermal Diode 1.
0 V to 2.25 V Analog Input. Can be reconfigured as thermistor input or as a cathode
connection to Thermal Diode 2. Configured for thermistor connection by default.
0 V to 2.25 V Analog Input. Can be reconfigured as thermistor input or as an anode
connection to Thermal Diode 2. Configured for thermistor connection by default.
2.25 V Reference Voltage Output, 20 mA maximum output current.
Open-Drain Digital Output. The SMBus ALERT pin alerts the system to out-of-limit events
such as a failed fan, overtemperature, or out-of-limit analog measurement.
Open-Drain Digital I/O. SMBus bidirectional serial data. Requires SMBus pull-up resistor.
Open-Drain Digital Input. SMBus serial clock input. Requires SMBus pull-up resistor.
Rev. 0 | Page 7 of 48
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