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ADM1031
Table 3. P IN  ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
PWM_OUT1
TACH1/AIN1
PWM_OUT2
TACH2/AIN2
GND
VCC
THERM
FAN_FAULT
D1–
D1+
D2–
D2+
ADD
INT(SMBALERT)
SDA
SCL
Description
Digital Output, Open-Drain. Pulse width modulated output to control fan speed. Requires pullup
resistor (10 k W typical).
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).
Digital Output, Open-Drain. Pulse width modulated output to control FAN2 fan speed. Requires pullup
resistor (10 k W typical).
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 (2 W typical).
System Ground.
Power. Can be powered by 3.3 V standby power if monitoring in low power states is required.
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 k W ).
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 k W ).
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.
Analog Input. Connected to anode of first remote temperature-sensing diode.
Analog Input. Connected to cathode of second remote temperature-sensing diode.
Analog Input. Connected to anode of second remote temperature-sensing diode.
Three-State Logic Input. Sets two lower bits of device SMBus address.
Digital Output, Open-Drain. Can be programmed as an interrupt (SMBus ALERT) output for
temperature/fan speed interrupts. Requires pullup resistor (10 k W typical).
Digital I/O, Serial Bus Bidirectional Data. Open-drain output. Requires pullup resistor (2.2 k W typical).
Digital Input, Serial Bus Clock. Requires pullup resistor (2.2 k W typical).
Table 4. ELECTRICAL CHARACTERISTICS (T A = T MIN to T MAX , V CC = V MIN to V MAX , unless otherwise noted.) (Note 1)
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
POWER SUPPLY
Supply Voltage, V CC
3.0
3.3
3.6
V
Supply Current, I CC
Interface inactive, ADC active
Standby mode
?
?
1.4
32
3.0
50
mA
m A
TEMPERATURE-TO-DIGITAL CONVERTER
Local Sensor Accuracy
Resolution
?
?
? 1.0
0.25
? 3.0
?
? C
? C
Remote Diode1 Sensor Accuracy
Remote Diode2 Sensor Accuracy
Resolution
Remote Sensor Source Current
60 ? C ? T D ? 100 ? C
60 ? C ? T D ? 100 ? C
High level
Low level
?
?
?
?
?
? 0.5
? 0.5
0.125
180
11
? 1.0
? 1.75
?
?
?
? C
? C
? C
m A
OPEN-DRAIN DIGITAL OUTPUTS (THERM, INT, FAN_FAULT, PWM_OUT)
Output Low Voltage, V OL
High-Level Output Leakage Current, I OH
I OUT = –6.0 mA; V CC = 3.0 V
V OUT = V CC ; V CC = 3.0 V
?
?
?
0.1
0.4
1.0
V
m A
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