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ADM1031ARQZ

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Semiconductor Components Industries, LLC, 2012
April, 2012 − Rev. 5
1 Publication Order Number:
ADM1031/D
ADM1031
Intelligent Temperature
Monitor and Dual PWM Fan
Controller
The ADM1031 is an ACPI-compliant, three-channel digital
thermometer and under/overtemperature alarm for use in personal
computers and thermal management systems. Optimized for the
Pentium
III, the part offers a 1C higher accuracy, which allows
system designers to safely reduce temperature guard-banding and
increase system performance.
Two PWM fan control outputs control the speed of two cooling fans
by varying output duty cycle. Duty cycle values between 33% and
100% allow smooth control of the fans. The speed of each fan can be
monitored via TACH inputs, which can be reprogrammed as analog
inputs to allow speeds for 2-wire fans to be measured via sense
resistors. The device also detects a stalled fan. A dedicated fan speed
control loop provides control without the intervention of CPU
software. It also ensures that if the CPU or system locks up, each fan
can still be controlled based on temperature measurements, and the fan
speed is adjusted to correct any changes in system temperature. Fan
speed can also be controlled using existing ACPI software.
Two inputs (4 pins) are dedicated to remote temperature-sensing
diodes with an accuracy of 1C, and an on-chip temperature sensor
allows ambient temperature to be monitored. The device has a
programmable INT
output to indicate error conditions, and a dedicated
FAN_FAULT
output to signal fan failure. The THERM pin is a
fail-safe output for overtemperature conditions that can be used to
throttle a CPU clock.
Features
Optimized for Pentium
III
Reduced Guard-banding Software
Automatic Fan Speed Control, Independent of CPU Intervention
After Initial Setup
0.125C Resolution on External Temperature Channels
Control Loop to Minimal Acoustic Noise and Battery Consumption
Remote Temperature Measurement Accurate to 1C
Using Remote Diode (Two Channels)
Local Sensor with 0.25C Resolution
Pulse Width Modulation (PWM) Fan Control for 2 Fans
Programmable PWM Frequency and PWM Duty Cycle
Tach Fan Speed Measurement (Two Channels)
Analog Input to Measure Fan Speed of 2-wire Fans
(Using Sense Resistor)
2-wire System Management Bus (SMBus) with ARA
Support
Overtemperature THERM Output Pin for CPU
Throttling
Programmable INT Output Pin
Configurable Offsets for Temperature Channels 3.0 V
to 5.5 V Supply Range
Shutdown Mode to Minimize Power Consumption
Limit Comparison of All Monitored Values
This is a Pb-Free Device
Applications
Notebook PCs, Network Servers, and Personal
Computers
Telecommunications Equipment
http://onsemi.com
1031ARQZ = Specific Device Code
# = Pb-Free Package
YY = Date Code
WW = Work Week
See detailed ordering and shipping information in the package
dimensions section on page 31 of this data sheet.
ORDERING INFORMATION
MARKING DIAGRAM
1
1031A
RQZ
#YYWW
QSOP−16
CASE 492
PIN ASSIGNMENT
INT (SMBALERT)
SCL
SDA
ADD
D2+
D1+
D1−
D2−
PWM_OUT1
TACH1/AIN1
PWM_OUT2
TACH2/AIN2
GND
V
CC
THERM
FAN_FAULT
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
ADM1031
ADM1031
http://onsemi.com
2
Figure 1. Functional Block Diagram
ADM1031
PWM_OUT1
PWM_OUT2
TACH2/AIN2
TACH1/AIN1
D1+
D1−
D2+
D2−
PWM
CONTROLLERS
TACH SIGNAL
CONDITIONING
BANDGAP
TEMPERATURE
SENSOR
SLAVE
ADDRESS
REGISTER
FAN FILTER
REGISTER
FAN
CHARACTERISTICS
REGISTER
FAN
CONFIG
REGISTER
FAN SPEED
COUNTER
ANALOG
MULTIPLEXER
ADC
2.5 V
BANDGAP
REFERENCE
SERIAL BUS
INTERFACE
ADDRESS
STATUS
REGISTERS
INTERRUPT
STATUS
REGISTERS
LIMIT
COMPARATOR
VALUE & LIMIT
REGISTERS
OFFSET
REGISTERS
CONFIGURATION
REGISTERS
GND
V
CC
ADD
SDA
SCL
INT
(SMBALERT)
THERM
FAN_FAULT
5
11
12
9
10
2
4
3
1
6
8
7
14
16
15
13
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
Positive Supply Voltage (V
CC
) 6.5 V
Voltage on Any Input or Output Pin −0.3 to +6.5 V
Input Current at Any Pin 5 mA
Package Input Current 20 mA
Maximum Junction Temperature (T
J
max
) 150 C
Storage Temperature Range −65 to +150 C
Lead Temperature, Soldering
Vapor Phase (60 sec)
Infrared (15 sec)
215
200
C
ESD Rating − All Pins 2000 V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.
Table 2. THERMAL CHARACTERISTICS
Package Type
q
JA
q
JC
Unit
16-lead QSOP 105 39 C/W
NOTE: q
JA
is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.
ADM1031
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3
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 (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
mA
TEMPERATURE-TO-DIGITAL CONVERTER
Local Sensor Accuracy
− 1.0 3.0 C
Resolution − 0.25 − C
Remote Diode1 Sensor Accuracy 60C T
D
100C − 0.5 1.0 C
Remote Diode2 Sensor Accuracy 60C T
D
100C − 0.5 1.75 C
Resolution − 0.125 − C
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
= 3.0 V − − 0.4 V
High-Level Output Leakage Current, I
OH
V
OUT
= V
CC
; V
CC
= 3.0 V − 0.1 1.0
mA
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ADM1031ARQZ

Mfr. #:
Buy ADM1031ARQZ
Manufacturer:
ON Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers 2 CH TDM PWM FAN CTRL IC
Lifecycle:
New from this manufacturer.
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