ADM1030
http://onsemi.com
3
Table 3. PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Description
1
PWM_OUT
Digital Output (Open-Drain). Pulsewidth modulated output to control fan speed. Requires pull-up
resistor (10 kW typical).
2
TACH/AIN
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 W typical)
3, 4, 11, 12
NC
Not Connected.
5
GND
System Ground.
6
V
CC
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 pull-up resistor (10 kW).
8
FAN_FAULT
Digital Output (Open-Drain). Can be used to signal a fan failure. Requires pull-up resistor (typically
10 kW).
9
D
Analog Input. Connected to cathode of an external temperature-sensing diode. The
temperature-sensing element is either a Pentium
?/DIV>
III substrate transistor or a general-purpose
2N3904.
10
D+
Analog Input. Connected to anode of the external temperature-sensing diode.
13
ADD
Three-state Logic Input. Sets two lower bits of device SMBus address.
14
INT
Digital Output (Open-Drain). Can be programmed as an interrupt output for temperature/fan speed
interrupts. Requires pull-up resistor (10 kW typical).
15
SDA
Digital I/O. Serial Bus Bidirectional Data. Open-drain output. Requires pull-up resistor (2.2 kW typical).
16
SCL
Digital Input. Serial Bus Clock. Requires pull-up resistor (2.2 kW 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
5.5
V
Supply Current, I
CC
Interface Inactive, ADC Active
Standby Mode
1.4
32
3.0
50
mA
mA
TEMPERATURE-TO-DIGITAL CONVERTER
Internal Sensor Accuracy
?.0
?.0
癈
Resolution
0.25
癈
External Diode Sensor Accuracy
60癈 < T
D
< 100癈
?.0
癈
Resolution
0.125
癈
Remote Sensor Source Current
High Level
Low Level
180
11
mA
OPEN-DRAIN DIGITAL OUTPUTS (THERM
, INT
, FAN_FAULT
, PWM_OUT)
Output Low Voltage, V
OL
I
OUT
= 6.0 mA, V
CC
= 3 V
0.4
V
High Level Output Current, I
OH
V
OUT
= V
CC
, V
CC
= 3 V
0.1
1.0
mA
DIGITAL INPUT LEAKAGE CURRENT
Input High Current, I
IH
V
IN
= V
CC
1.0
mA
Input Low Current, I
IL
V
IN
= 0
1.0
mA
Input Capacitance, C
IN
5
pF
DIGITAL INPUT LOGIC LEVELS (ADD, THERM
, TACH) (Note 2)
Input High Voltage, V
IH
2.1
V
Input Low Voltage, V
IL
0.8
V
OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA)
Output Low Voltage, V
OL
I
OUT
= 6.0 mA, V
CC
= 3 V
0.4
V
High Level Output Leakage Current, I
OH
V
OUT
= V
CC
0.1
1.0
mA
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