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PDF ADM1030 Data sheet ( Hoja de datos )
| Número de pieza | ADM1030 | |
| Descripción | Intelligent Temperature Monitor and PWM Fan Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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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 Pentium III,
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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QSOP−16
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 Pentium III: 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
1 page  
ADM1030
TYPICAL PERFORMANCE CHARACTERISTICS
15
10
5
DXP TO GND
0
−5 DXP TO VCC (3.3 V)
−10
−15
−20
1
3.3 10 30 100
LEAKAGE RESISTANCE (MW)
Figure 3. Temperature Error vs. PCB Track
Resistance
17
15 VIN = 100 mV p−p
13
11
9
7
5
3
1
−1 VIN = 200 mV p−p
0 500k 2M 4M 6M 10M 100M 400M
FREQUENCY (Hz)
Figure 5. Temperature Error vs. Power Supply
Noise Frequency
110
100
90
80
70
60
50
40
30
20
10
0
0
10 20 30 40 50 60 70 80
PIII TEMPERATURE (C)
90 100 110
Figure 4. Pentium) III Temperature Measurement
vs. ADM1030 Reading
1
0
−1
−2
−3
−4
−5
−6
−7
−8
−9
−10
−11
−12
−13
−14
−15
−16
1 2.2 3.3 4.7 10 22 47
DXP − DXN CAPACITANCE (nF)
Figure 6. Temperature Error vs. Capacitance
between D+ and D−
7
6
5
4
3 VIN = 40 mV p−p
2
1
0
−1 VIN = 20 mV p−p
0 100k 1M 100M 200M 300M 400M 500M
FREQUENCY (Hz)
Figure 7. Temperature Error vs. Common-mode
Noise Frequency
110
100
90
80
70
60 VCC = 5 V
50
40
30
20 VCC = 3.3 V
10
0
0 1 5 10 25 50 75 100 250 500 750 1000
SCLK FREQUENCY (kHz)
Figure 8. Standby Current vs. Clock Frequency
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5 Page 
ADM1030
noisy environment, a capacitor of value up to 1000 pF may
be placed between the D+ and D– inputs to filter the noise.
To measure DVBE, the sensor is switched between
operating currents of I and N I. The resulting waveform is
passed through a 65 kHz low-pass filter to remove noise,
then to a chopperstabilized amplifier that performs the
functions of amplification and rectification of the waveform
to produce a dc voltage proportional to DVBE. This voltage
is measured by the ADC to give a temperature output in
11-bit two’s complement format. To further reduce the
effects of noise, digital filtering is performed by averaging
the results of 16 measurement cycles. An external
temperature measurement nominally takes 9.6 ms.
Layout Considerations
Digital boards can be electrically noisy environments and
care must be taken to protect the analog inputs from noise,
particularly when measuring the very small voltages from
a remote diode sensor. The following precautions should be
taken:
1. Place the ADM1030 as close as possible to the
remote sensing diode. Provided that the worst
noise sources such as clock generators,
data/address buses, and CRTs are avoided, this
distance can be 4 to 8 inches.
2. Route the D+ and D– tracks close together, in
parallel, with grounded guard tracks on each side.
Provide a ground plane under the tracks if
possible.
3. Use wide tracks to minimize inductance and
reduce noise pick-up. 10 mil track minimum width
and spacing is recommended.
GND
D+
D−
GND
10 MIL
10 MIL
10 MIL
10 MIL
10 MIL
10 MIL
10 MIL
Figure 19. Arrangement of Signal Tracks
4. Try to minimize the number of copper/solder
joints, which can cause thermocouple effects.
Where copper/solder joints are used, make sure
that they are in both the D+ and D– path and at the
same temperature.
Thermocouple effects should not be a major
problem as 1C corresponds to about 200 mV, and
thermocouple voltages are about 3 mV/C of
temperature difference. Unless there are two
thermocouples with a big temperature differential
between them, thermocouple voltages should be
much less than 200 mV.
5. Place a 0.1 mF bypass capacitor close to the
ADM1030.
6. If the distance to the remote sensor is more than
8 inches, the use of twisted pair cable is
recommended. This will work up to about 6 to
12 feet.
7. For really long distances (up to 100 feet) use
shielded twisted pair such as Belden #8451
microphone cable. Connect the twisted pair to D+
and D– and the shield to GND close to the
ADM1030. Leave the remote end of the shield
unconnected to avoid ground loops.
Because the measurement technique uses switched
current sources, excessive cable and/or filter capacitance
can affect the measurement. When using long cables, the
filter capacitor C1 may be reduced or removed. In any case
the total shunt capacitance should not exceed 1000 pF.
Cable resistance can also introduce errors. 1 W series
resistance introduces about 0.5C error.
Addressing the Device
ADD (Pin 13) is a three-state input. It is sampled, on
power-up to set the lowest two bits of the serial bus address.
Up to three addresses are available to the systems designer
via this address pin. This reduces the likelihood of conflicts
with other devices attached to the System Management Bus.
The ADM1030 Interrupt System
The ADM1030 has two interrupt outputs, INT and
THERM. These have different functions. INT responds to
violations of software programmed temperature limits and
is maskable (described in more detail later).
THERM is intended as a “fail-safe” interrupt output that
cannot be masked. If the temperature is below the low
temperature limit, the INT pin will be asserted low to
indicate an out-of-limit condition. If the temperature
exceeds the high temperature limit, the INT pin will also be
asserted low. A third limit; THERM limit, may be
programmed into the device to set the temperature limit
above which the overtemperature THERM pin will be
asserted low. The behavior of the high limit and THERM
limit is as follows:
1. Whenever the temperature measured exceeds the
high temperature limit, the INT pin is asserted low.
2. If the temperature exceeds the THERM limit, the
THERM output asserts low. This can be used to
throttle the CPU clock. If the THERM-to-Fan
Enable bit (Bit 7 of THERM behavior/revision
register) is cleared to 0, the fan will not run
full-speed. The THERM limit may be programmed
at a lower temperature than the high temperature
limit. This allows the system to run in silent mode,
where the CPU can be throttled while the cooling
fan is off. If the temperature continues to increase,
and exceeds the high temperature limit, an INT is
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADM1030.PDF ] | |
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