ADM1031(2012) データシートの表示（PDF） - ON Semiconductor
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ADM1031 Datasheet PDF : 32 Pages
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ADM1031
Table 3. PIN ASSIGNMENT
Pin No.
Mnemonic
Description
1
PWM_OUT1
Digital Output, Open-Drain. Pulse width modulated output to control fan speed. Requires pullup
resistor (10 kW typical).
2
TACH1/AIN1
Digital/Analog Input. Fan tachometer input to measure FAN1 fan speed. Can be reprogrammed as an
analog input to measure speed of a 2-wire fan via a sense resistor (2 W typical).
3
PWM_OUT2
Digital Output, Open-Drain. Pulse width modulated output to control FAN2 fan speed. Requires pullup
resistor (10 kW typical).
4
TACH2/AIN2
Digital/Analog Input. Fan tachometer input to measure FAN2 fan speed. Can be reprogrammed as an
analog input to measure speed of a 2-wire fan via a sense resistor (2ĂW typical).
5
GND
System Ground.
6
VCC
Power. Can be powered by 3.3 V standby power if monitoring in low power states is required.
7
THERM
Digital I/O, Open-Drain. An active low thermal overload output that indicates a violation of a
temperature set point (overtemperature). Also acts as an input to provide external fan control. When
this pin is pulled low by an external signal, a status bit is set, and the fan speed is set to full-on.
Requires pullup resistor (10 kW).
8
FAN_FAULT
Digital Output, Open-Drain. Can be used to signal a fan fault. Drives second fan to full speed if one
fan fails. Requires pullup resistor (typically 10 kW).
9
D1–
Analog Input. Connected to cathode of first remote temperature-sensing diode. The
temperature-sensing element is either a Pentium III substrate transistor or a general-purpose
2N3904.
10
D1+
Analog Input. Connected to anode of first remote temperature-sensing diode.
11
D2–
Analog Input. Connected to cathode of second remote temperature-sensing diode.
12
D2+
Analog Input. Connected to anode of second remote temperature-sensing diode.
13
ADD
Three-State Logic Input. Sets two lower bits of device SMBus address.
14
INT(SMBALERT) Digital Output, Open-Drain. Can be programmed as an interrupt (SMBus ALERT) output for
temperature/fan speed interrupts. Requires pullup resistor (10 kW typical).
15
SDA
Digital I/O, Serial Bus Bidirectional Data. Open-drain output. Requires pullup resistor (2.2 kW typical).
16
SCL
Digital Input, Serial Bus Clock. Requires pullup resistor (2.2 kW typical).
Table 4. ELECTRICAL CHARACTERISTICS (TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted.) (Note 1)
Parameter
Test Conditions/Comments
Min
Typ
Max Unit
POWER SUPPLY
Supply Voltage, VCC
Supply Current, ICC
Interface inactive, ADC active
Standby mode
3.0
3.3
3.6
V
−
1.4
3.0
mA
−
32
50
mA
TEMPERATURE-TO-DIGITAL CONVERTER
Local Sensor Accuracy
Resolution
Remote Diode1 Sensor Accuracy
Remote Diode2 Sensor Accuracy
Resolution
60C TD 100C
60C TD 100C
−
1.0
3.0
C
−
0.25
−
C
−
0.5
1.0
C
−
0.5 1.75
C
−
0.125
−
C
Remote Sensor Source Current
High level
Low level
−
180
−
mA
−
11
−
OPEN-DRAIN DIGITAL OUTPUTS (THERM, INT, FAN_FAULT, PWM_OUT)
Output Low Voltage, VOL
High-Level Output Leakage Current, IOH
IOUT = –6.0 mA; VCC = 3.0 V
VOUT = VCC; VCC = 3.0 V
−
−
0.4
V
−
0.1
1.0
mA
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