ADM1030
PIN FUNCTION DESCRIPTIONS
Pin No.
1
2
3, 4, 11, 12
5
6
7
Mnemonic
PWM_OUT
TACH/AIN
NC
GND
V
CC
THERM
Description
Digital Output (Open-Drain). Pulsewidth modulated output to control fan speed. Requires pull-
up resistor (10 kΩ typical).
Digital/Analog Input. Fan tachometer input to measure fan speed. May be reprogrammed as an
analog input to measure speed of a 2-wire fan via a sense resistor (2
Ω
typical)
Not Connected.
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 pull-up resistor (10 kΩ).
Digital Output (Open-Drain). Can be used to signal a fan failure. Requires pull-up resistor
(typically 10 kΩ).
Analog Input. Connected to cathode of an external 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 the external 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 output for temperature/fan
speed interrupts. Requires pull-up resistor (10 kΩ typical).
Digital I/O. Serial Bus Bidirectional Data. Open-drain output. Requires pull-up resistor
(2.2 kΩ typical).
Digital Input. Serial Bus Clock. Requires pull-up resistor (2.2 kΩ typ).
8
9
10
13
14
15
16
FAN_FAULT
D–
D+
ADD
INT
SDA
SCL
PIN CONFIGURATION
PWM_OUT
1
TACH/AIN
2
NC
3
NC
4
16
SCL
15
SDA
ADM1030
14
INT
13
ADD
TOP VIEW
GND
5
(Not to Scale)
12
NC
V
CC 6
THERM
7
FAN_FAULT
8
11
NC
10
D+
9
D–
NC = NO CONNECT
–4–
REV. 0
AD [ ANALOG DEVICES ]
