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PDF ( 数据手册 , 数据表 ) ADM1030

零件编号 ADM1030
描述 Intelligent Temperature Monitor and PWM Fan Controller
制造商 ON Semiconductor
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ADM1030 数据手册, 描述, 功能
ADM1030
Intelligent Temperature
Monitor and PWM Fan
Controller
The ADM1030 is an ACPI-compliant two-channel digital
thermometer and under/over temperature alarm, for use in computers
and thermal management systems. Optimized for the PentiumIII,
the higher 1C accuracy offered allows systems designers to safely
reduce temperature guardbanding and increase system performance.
A Pulsewidth Modulated (PWM) Fan Control output controls the
speed of a cooling fan by varying output duty cycle. Duty cycle values
between 33%–100% allow smooth control of the fan. The speed of the
fan can be monitored via a TACH input for a fan with a tach output.
The TACH input can be programmed as an analog input, allowing the
speed of a 2-wire fan to be determined via a sense resistor. The device
will also detect a stalled fan. A dedicated Fan Speed Control Loop
provides control even without the intervention of CPU software. It
also ensures that if the CPU or system locks up, the fan can still be
controlled based on temperature measurements, and the fan speed
adjusted to correct any changes in system temperature. Fan Speed may
also be controlled using existing ACPI software. One input (two pins)
is dedicated to a remote temperaturesensing diode with an accuracy of
1C, and a local temperature sensor allows ambient temperature to be
monitored. The device has a programmable INT output to indicate
error conditions. There is a dedicated FAN_FAULT output to signal
fan failure. The THERM pin is a fail-safe output for over-temperature
conditions that can be used to throttle a CPU clock.
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QSOP16
CASE 492
PIN ASSIGNMENT
PWM_OUT 1
16 SCL
TACH/AIN 2
15 SDA
NC 3
14 INT
NC 4
ADM1030
Top View
13 ADD
GND 5 (Not To Scale) 12 NC
VCC 6
THERM 7
11 NC
10 D+
FAN_FAULT 8
9 D
Features
Optimized for PentiumIII: Allows Reduced Guardbanding
NC = No Connect
Software and Automatic Fan Speed Control
Automatic Fan Speed Control Allows Control Independent of CPU
MARKING DIAGRAM
Intervention after Initial Setup
Control Loop Minimizes Acoustic Noise and Battery Consumption
Remote Temperature Measurement Accurate to 1C Using Remote
Diode
0.125C Resolution on Remote Temperature Channel
1030A
RQZ
#YYWW
Local Temperature Sensor with 0.25C Resolution
Pulsewidth Modulation Fan Control (PWM)
Programmable PWM Frequency
1029ARQZ
#
= Special Device Code
= Pb-Free Package
Programmable PWM Duty Cycle
Tach Fan Speed Measurement
YY = Year
WW = Work Week
Analog Input To Measure Fan Speed of 2-wire Fans
(Using Sense Resistor)
ORDERING INFORMATION
2-wire System Management Bus (SMBus) with ARA Support
Overtemperature THERM Output Pin
See detailed ordering and shipping information in the package
dimensions section on page 29 of this data sheet.
Programmable INT Output Pin
Configurable Offset for All Temperature Channels
3 V to 5.5 V Supply Range
Shutdown Mode to Minimize Power Consumption
This is a Pb-Free Device*
Applications
Notebook PCs, Network Servers and Personal
Computers
Telecommunications Equipment
* For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
Semiconductor Components Industries, LLC, 2012
April, 2012 Rev. 3
1
Publication Order Number:
ADM1030/D







ADM1030 pdf, 数据表
ADM1030
during the high period, as a low-to-high transition
when the clock is high may 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 will pull the data line high during the
tenth clock pulse to assert a STOP condition. In
READ mode, the master device will override 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
will then take 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 may 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 ADM1030, write operations contain
either one or two bytes, and read operations contain one
byte, and perform the following functions.
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 into 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, then 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.
When reading data from a register there are two
possibilities:
1. If the ADM1030’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 ADM1030 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, because the first
data byte of a write is always written to the Address Pointer
Register.
2. In Figures 15 to 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 ADM1030 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
ADM1030
1
FRAME 2
ADDRESS POINTER REGISTER BYTE
9
ACK. BY
ADM1030
SCL (CONTINUED)
SDA (CONTINUED)
D7 D6 D5 D4 D3 D2 D1 D0
FRAME 3
DATA BYTE
ACK. BY STOP BY
ADM1030 MASTER
Figure 15. Writing a Register Address to the Address Pointer Register,
then Writing Data to the Selected Register
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ADM1030 equivalent, schematic
ADM1030
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 0x00 Configuration Register 1
<7>
<6:5>
Logic 1 selects Automatic Fan Speed
Control, Logic 0 selects software control
(Default = 1).
00 = Remote Temperature controls Fan
11 = Fastest Calculated Speed controls the
fan when Bit 7 = Logic 1.
Register 0x20 Fan Characteristics Register 1
<2:0>
<5:3>
<7:6>
Fan 1 Spin-up Time
000 = 200 ms
001 = 400 ms
010 = 600 ms
011 = 800 ms
100 = 1 sec
101 = 2 secs (Default)
110 = 4 secs
111 = 8 secs
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 0x22 Fan Speed Configuration Register
<3:0>
Min Speed: This nibble contains the speed at
which the fan will run when the temperature
is at TMIN. The default is 0x05, meaning that
the fan will run at 33% duty cycle when the
temperature is at TMIN.
Register 0x24 Local Temp TMIN/TRANGE
<7:3>
<2:0>
Local Temp TMIN. These bits set the
temperature at which the fan will turn on
when under Auto Fan Speed Control. TMIN
can be programmed in 4C increments.
00000 = 0C
00001 = 4C
00010 = 8C
00011 = 12C
|
|
01000 = 32C (Default)
|
|
11110 = 120C
11111 = 124C
Local Temperature TRANGE. This nibble sets
the temperature range over which Automatic
Fan Speed Control takes place.
000 = 5C
001 = 10C
010 = 20C
011 = 40C
100 = 80C
Register 0x25 Remote Temperature TMIN/TRANGE
<7:3>
<2:0>
Remote Temperature TMIN. Sets the
temperature at which the fan will switch on
based on Remote Temperature Readings.
00000 = 0C
00001 = 4C
00010 = 8C
00011 = 12C
|
|
01100 = 48C
|
|
11110 = 120C
11111 = 124C
Remote Temperature TRANGE. This nibble
sets the temperature range over which the fan
will be controlled based on Remote
Temperature readings.
000 = 5C
001 = 10C
010 = 20C
011 = 40C
100 = 80C
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