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| 型号： | ADM1031ARQZ-R7 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | LEAD FREE, QSOP-16 |
| 文件页数： | 23/30页 |
| 文件大小： | 299K |
| 代理商： | ADM1031ARQZ-R7 |
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ADM1031
http://onsemi.com
3
PIN ASSIGNMENT
Pin No.
Mnemonic
Description
1
PWM_OUT1
Digital Output, OpenDrain. 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 2wire fan via a sense resistor (2 W typical).
3
PWM_OUT2
Digital Output, OpenDrain. 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 2wire fan via a sense resistor (2 W 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, OpenDrain. 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 fullon.
Requires pullup resistor (10 kW).
8
FAN_FAULT
Digital Output, OpenDrain. 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 temperaturesensing diode. The
temperaturesensing element is either a Pentium III substrate transistor or a generalpurpose
2N3904.
10
D1+
Analog Input. Connected to anode of first remote temperaturesensing diode.
11
D2–
Analog Input. Connected to cathode of second remote temperaturesensing diode.
12
D2+
Analog Input. Connected to anode of second remote temperaturesensing diode.
13
ADD
ThreeState Logic Input. Sets two lower bits of device SMBus address.
14
INT(SMBALERT)
Digital Output, OpenDrain. 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. Opendrain output. Requires pullup resistor (2.2 kW typical).
16
SCL
Digital Input, Serial Bus Clock. Requires pullup resistor (2.2 kW typical).
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
3.0
3.3
3.6
V
Supply Current, ICC
Interface inactive, ADC active
Standby mode
1.4
32
3.0
50
mA
TEMPERATURETODIGITAL CONVERTER
Local Sensor Accuracy
±1.0
±3.0
°C
Resolution
0.25
°C
Remote Diode1 Sensor Accuracy
60°C ≤ TD ≤ 100°C
±0.5
±1.0
°C
Remote Diode2 Sensor Accuracy
60°C ≤ TD ≤ 100°C
±0.5
±1.75
°C
Resolution
0.125
°C
Remote Sensor Source Current
High level
Low level
180
11
mA
OPENDRAIN DIGITAL OUTPUTS (THERM, INT, FAN_FAULT, PWM_OUT)
Output Low Voltage, VOL
IOUT = –6.0 mA; VCC = 3.0 V
0.4
V
HighLevel Output Leakage Current, IOH
VOUT = VCC; VCC = 3.0 V
0.1
1.0
mA
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