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PDF ( 数据手册 , 数据表 ) ADM1031

零件编号 ADM1031
描述 Intelligent Temperature Monitor and Dual PWM Fan Controller
制造商 ON Semiconductor
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ADM1031 数据手册, 描述, 功能
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
PentiumIII, the part offers a 1C higher accuracy, which allows
system designers to safely reduce temperature guard-banding and
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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
QSOP16
CASE 492
monitored via TACH inputs, which can be reprogrammed as analog
inputs to allow speeds for 2-wire fans to be measured via sense
PIN ASSIGNMENT
resistors. The device also detects a stalled fan. A dedicated fan speed
control loop provides control without the intervention of CPU
PWM_OUT1 1
16 SCL
software. It also ensures that if the CPU or system locks up, each fan
TACH1/AIN1 2
15 SDA
can still be controlled based on temperature measurements, and the fan
PWM_OUT2 3
14 INT (SMBALERT)
speed is adjusted to correct any changes in system temperature. Fan
speed can also be controlled using existing ACPI software.
TACH2/AIN2 4
GND 5
ADM1031
13 ADD
12 D2+
Two inputs (4 pins) are dedicated to remote temperature-sensing
VCC 6
11 D2
diodes with an accuracy of 1C, and an on-chip temperature sensor
allows ambient temperature to be monitored. The device has a
THERM 7
FAN_FAULT 8
10 D1+
9 D1
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
MARKING DIAGRAM
throttle a CPU clock.
Features
Optimized for PentiumIII
Reduced Guard-banding Software
Automatic Fan Speed Control, Independent of CPU Intervention
1
1031A
RQZ
#YYWW
After Initial Setup
0.125C Resolution on External Temperature Channels
Control Loop to Minimal Acoustic Noise and Battery Consumption
1031ARQZ = Specific Device Code
# = Pb-Free Package
Remote Temperature Measurement Accurate to 1C
Using Remote Diode (Two Channels)
YY = Date Code
WW = Work Week
Local Sensor with 0.25C Resolution
Pulse Width Modulation (PWM) Fan Control for 2 Fans
Programmable PWM Frequency and PWM Duty Cycle
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 31 of this data sheet.
Tach Fan Speed Measurement (Two Channels)
Analog Input to Measure Fan Speed of 2-wire Fans
Programmable INT Output Pin
(Using Sense Resistor)
2-wire System Management Bus (SMBus) with ARA
Configurable Offsets for Temperature Channels 3.0 V
to 5.5 V Supply Range
Support
Overtemperature THERM Output Pin for CPU
Throttling
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
Semiconductor Components Industries, LLC, 2012
April, 2012 Rev. 5
1
Publication Order Number:
ADM1031/D







ADM1031 pdf, 数据表
ADM1031
during the high period, as a low-to-high transition
when the clock is high can be interpreted as a stop
signal. The number of data bytes that can be
transmitted over the serial bus in a single read or
write operation is limited only by what the master
and slave devices can handle.
3. When all data bytes have been read or written,
stop conditions are established. In write mode, the
master pulls the data line high during the tenth
clock pulse to assert a stop condition. In read
mode, the master device overrides the
acknowledge bit by pulling the data line high
during the low period before the ninth clock pulse.
This is known as No Acknowledge. The master
then takes the data line low during the low period
before the tenth clock pulse, then high during the
tenth clock pulse to assert a stop condition.
Any number of bytes of data can be transferred over the
serial bus in one operation, but it is not possible to mix read
and write in one operation, because the type of operation is
determined at the beginning and cannot subsequently be
changed without starting a new operation.
In the case of the ADM1031, write operations contain
either one byte or two bytes, and read operations contain one
byte, and perform the functions described next.
Writing Data to a Register
To write data to one of the device data registers or read
data from it, the address pointer register must be set so that
the correct data register is addressed; data can then be
written to that register or read from it. The first byte of a
write operation always contains an address that is stored in
the address pointer register. If data is to be written to the
device, the write operation contains a second data byte that
is written to the register selected by the address pointer
register.
This is illustrated in Figure 15. The device address is sent
over the bus followed by R/W set to 0. This is followed by
two data bytes. The first data byte is the address of the
internal data register to be written to, which is stored in the
address pointer register. The second data byte is the data to
be written to the internal data register.
Reading Data from a Register
When reading data from a register there are two
possibilities:
1. If the ADM1031’s address pointer register value is
unknown or not the desired value, it is first
necessary to set it to the correct value before data
can be read from the desired data register. This is
done by performing a write to the ADM1031 as
before, but only the data byte containing the
register address is sent, as data is not to be written
to the register. This is shown in Figure 16.
A read operation is then performed consisting of
the serial bus address, R/W bit set to 1, followed
by the data byte read from the data register. This is
shown in Figure 17.
2. If the address pointer register is known to be
already at the desired address, data can be read
from the corresponding data register without first
writing to the address pointer register, so Figure 16
can be omitted.
NOTES:
1. Although it is possible to read a data byte from a data
register without first writing to the address pointer register,
if the address pointer register is already at the correct value,
it is not possible to write data to a register without writing to
the address pointer register. This is because the first data
byte of a write is always written to the address pointer
register.
2. In Figure 15, Figure 16, and Figure 17, the serial bus
address is shown as the default value 01011(A1)(A0),
where A1 and A0 are set by the three-state ADD pin.
3. The ADM1031 also supports the Read Byte protocol, as
described in the system management bus specification.
SCL
1
91
9
SDA
START BY
MASTER
0
1 0 1 1 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADM1031
1
FRAME 2
ADDRESS POINTER REGISTER BYTE
9
ACK. BY
ADM1031
SCL (CONTINUED)
SDA (CONTINUED)
D7 D6 D5 D4 D3 D2 D1 D0
FRAME 3
DATA BYTE
ACK. BY STOP BY
ADM1031 MASTER
Figure 15. Writing a Register Address to the Address Pointer Register,
then Writing Data to the Selected Register
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ADM1031 equivalent, schematic
ADM1031
Calculate TMAX
TMAX + TMIN ) ((Max DC * Min DC)
TRANGEń10)
TMAX + 0 ) ((100% DC * 53% DC) 40ń10)
(eq. 3)
TMAX + 0 ) ((15 * 8) 4) + 28
TMAX =285C (As seen on Slope 2 of Figure 26)
Example 2:
TMIN
= 0C, TRANGE = 40C
Min DC = 73% = 11 decimal (Table 11)
Calculate TMAX
TMAX + TMIN ) ((Max DC * Min DC)
TRANGEń10)
TMAX + 0 ) ((100% DC * 73% DC)
TMAX + 0 ) ((15 * 11) 4) + 16
40ń10)
(eq. 4)
TMAX =165C (As seen on Slope 3 of Figure 26)
Example 3:
TMIN
= 0C, TRANGE = 40C
Min DC = 33% = 5 decimal (Table 11)
Calculate TMAX
TMAX + TMIN ) ((Max DC * Min DC)
TRANGEń10)
TMAX + 0 ) ((100% DC * 33% DC) 40ń10)
(eq. 5)
TMAX + 0 ) ((15 * 5) 4) + 40
TMAX =405C (As seen on Slope 1 of Figure 26)
In this case, since the Minimum Duty Cycle is the default
33%, the equation for TMAX reduces to:
TMAX + TMIN ) ((Max DC * Min DC) TRANGEń10)
TMAX + TMIN ) ((15 * 5) TRANGEń10)
TMAX + TMIN ) (10 TRANGEń10)
(eq. 6)
TMAX + TMIN ) TRANGE
Relevant Registers for Automatic Fan Speed
Control Mode
Register 0y00 Configuration Register 1
<7>
<6:5>
Logic 1 selects automatic fan speed control,
Logic 0 selects software control
(Default = 1).
01 = Remote Temp 1 controls Fan 1 and
Fan 2
10 = Remote Temp 2 controls Fan 1 and
Fan 2
11 = Fastest Calculated Speed controls
Fan 1 and 2
Register 0y20, 0y21 Fan Characteristics Registers 1, 2
<2:0>
<5:3>
<7:6>
Fan X Spin-Up Time.
000 = 200 ms
001 = 400 ms
010 = 600 ms
011 = 800 ms
100 = 1 sec
101 = 2 sec (Default)
110 = 4 sec
111 = 8 sec
PWM Frequency Driving the Fan.
000 = 11.7 Hz
001 = 15.6 Hz
010 = 23.4 Hz
011 = 31.25 Hz (Default)
100 = 37.5 Hz
101 = 46.9 Hz
110 = 62.5 Hz
111 = 93.5 Hz
Speed Range N; defines the lowest fan speed
that can be measured by the device.
00 = 1: Lowest Speed = 2647 RPM
01 = 2: Lowest Speed = 1324 RPM
10 = 4: Lowest Speed = 662 RPM
11 = 8: Lowest Speed = 331 RPM
Register 0y22 Fan Speed Configuration Register
<3:0>
<7:4>
Min Speed: This nibble contains the speed at
which the fan runs when the temperature is at
TMIN. The default is 005, meaning that the
fan runs at 33% duty cycle when the
temperature is at TMIN.
Min Speed: Determines the minimum PWM
cycle for Fan 2 in automatic fan speed
control mode.
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