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ADM1030 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM1030
Beschreibung Intelligent Temperature Monitor and PWM Fan Controller
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 28 Seiten
ADM1030 Datasheet, Funktion
a
Intelligent Temperature
Monitor and PWM Fan Controller
ADM1030*
FEATURES
Optimized for Pentium® III: Allows Reduced Guardbanding
Software and Automatic Fan Speed Control
Automatic Fan Speed Control Allows Control Indepen-
dent of CPU Intervention after Initial Setup
Control Loop Minimizes Acoustic Noise and Battery
Consumption
Remote Temperature Measurement Accurate to 1؇C
Using Remote Diode
0.125؇C Resolution on Remote Temperature Channel
Local Temperature Sensor with 0.25؇C Resolution
Pulsewidth Modulation Fan Control (PWM)
Programmable PWM Frequency
Programmable PWM Duty Cycle
Tach Fan Speed Measurement
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
Programmable INT Output Pin
Configurable Offset for All Temperature Channels
3 V to 5.5 V Supply Range
Shutdown Mode to Minimize Power Consumption
APPLICATIONS
Notebook PCs, Network Servers and Personal Computers
Telecommunications Equipment
PRODUCT DESCRIPTION
The ADM1030 is an ACPI-compliant two-channel digital ther-
mometer and under/over temperature alarm, for use in computers
and thermal management systems. Optimized for the Pentium
III, the higher 1°C accuracy offered allows systems designers to
safely reduce temperature guardbanding and increase system
performance. A Pulsewidth Modulated (PWM) Fan Control out-
put 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 pro-
vides 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 temperature-
sensing diode with an accuracy of ± 1°C, 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.
FUNCTIONAL BLOCK DIAGRAM
VCC
NC
NC
PWM_OUT
TACH/AIN
D+
D–
*Patents pending.
Pentium is a registered
trademark of Intel Corporation.
ADM1030
PWM
CONTROLLER
TACH SIGNAL
CONDITIONING
SLAVE
ADDRESS
REGISTER
FAN
CHARACTERISTICS
REGISTER
FAN SPEED
CONFIG
REGISTER
TMIN / T RANGE
REGISTER
FAN
SPEED
COUNTER
BANDGAP
TEMPERATURE
SENSOR
ANALOG
MULTIPLEXER
ADC
2.5V
BANDGAP
REFERENCE
GND
SERIAL BUS
INTERFACE
ADDRESS
POINTER
REGISTER
INTERRUPT
STATUS
REGISTER
LIMIT
COMPARATOR
VALUE AND LIMIT
REGISTERS
OFFSET
REGISTERS
CONFIGURATION
REGISTER
ADD
SDA
SCL
NC
INT
THERM
FAN_FAULT
NC
NC = NO CONNECT
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001






ADM1030 Datasheet, Funktion
ADM1030
7
VIN = 30mV p-p
6
5
4
3
2
1
0
1
0
VIN = 20mV p-p
100k 1M 100M 200M 300M 400M 500M
FREQUENCY Hz
TPC 7. Temperature Error vs. Differential-Mode Noise
Frequency
200
180
160
140
120
100
80
60
40
20
0
20
0
ADD = Hi-Z
ADD = GND
ADD = VCC
1.1 1.3 1.5 1.7 1.9 2.1 2.5 2.9 4.5
SUPPLY VOLTAGE V
TPC 8. Standby Supply Current vs. Supply Voltage
0.16
0.08
0
0.08
0.16
0.24
0.32
0.40
0.48
0.56
0.64
0.72
0.80
0.88
0
20 40 60 80 85 100 105 120
TEMPERATURE ؇C
TPC 9. Local Sensor Error
0.08
0
0.08
0.16
0.24
0.32
0.40
0.48
0.56
0.64
0.72
0.80
0
20 40 60
80 85 100 105 120
TEMPERATURE ؇C
TPC 10. Remote Sensor Error
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0
SUPPLY VOLTAGE V
TPC 11. Supply Current vs. Supply Voltage
120
110
100
90
80
70
60
50
40
30
20
10
0
0 1 2 3 4 5 6 7 8 9 10
TIME Sec
TPC 12. Response to Thermal Shock
–6– REV. 0

6 Page









ADM1030 pdf, datenblatt
ADM1030
AUTOMATIC FAN SPEED CONTROL
The ADM1030 has a local temperature channel and a remote
temperature channel, which may be connected to an on-chip
diode-connected transistor on a CPU. These two temperature
channels may be used as the basis for an automatic fan speed
control loop to drive a fan using Pulsewidth Modulation (PWM).
HOW DOES THE CONTROL LOOP WORK?
The Automatic Fan Speed Control Loop is shown in Fig-
ure 6 below.
MAX
SPIN UP FOR 2 SECONDS
FAN
SPEED
MIN
TMIN
TMAX = T MIN + T RANGE
TEMPERATURE
Figure 6. Automatic Fan Speed Control
In order for the fan speed control loop to work, certain loop
parameters need to be programmed into the device.
1. TMIN. The temperature at which the fan should switch on
and run at minimum speed. The fan will only turn on once
the temperature being measured rises above the TMIN value
programmed. The fan will spin up for a predetermined time
(default = 2 secs). See Fan Spin-Up section for more details.
2. TRANGE. The temperature range over which the ADM1030
will automatically adjust the fan speed. As the temperature
increases beyond TMIN, the PWM_OUT duty cycle will be
increased accordingly. The TRANGE parameter actually defines
the fan speed versus temperature slope of the control loop.
3. TMAX. The temperature at which the fan will be at its maxi-
mum speed. At this temperature, the PWM duty cycle
driving the fan will be 100%. TMAX is given by TMIN +
TRANGE. Since this parameter is the sum of the TMIN and
TRANGE parameters, it does not need to be programmed into
a register on-chip.
4. A hysteresis value of 5°C is included in the control loop to
prevent the fan continuously switching on and off if the tem-
perature is close to TMIN. The fan will continue to run until
such time as the temperature drops 5°C below TMIN.
Figure 7 shows the different control slopes determined by the
TRANGE value chosen, and programmed into the ADM1030.
TMIN was set to 0°C to start all slopes from the same point. It
can be seen how changing the TRANGE value affects the PWM
duty cycle versus temperature slope.
100
93
87
80
73
66
60 = 80؇C
53 T RANGE
47
40
33
0 5 10
TMIN
20
40
TEMPERATURE ؇C
60 80
TMAX = T MIN + TRANGE
Figure 7. PWM Duty Cycle vs. Temperature Slopes (TRANGE)
Figure 8 shows how, for a given TRANGE, changing the TMIN
value affects the loop. Increasing the TMIN value will increase
the TMAX (temperature at which the fan runs full speed) value,
since TMAX = TMIN + TRANGE. Note, however, that the PWM
Duty Cycle vs Temperature slope remains exactly the same.
Changing the TMIN value merely shifts the control slope. The
TMIN may be changed in increments of 4°C.
100
93
87
80
73
66
60
53
47
40
33
0
TMIN
20 40 60 80
TMAX = T MIN + T RANGE
TEMPERATURE ؇C
Figure 8. Effect of Increasing TMIN Value on Control Loop
FAN SPIN-UP
As was previously mentioned, once the temperature being mea-
sured exceeds the TMIN value programmed, the fan will turn on
at minimum speed (default = 33% duty cycle). However, the
problem with fans being driven by PWM is that 33% duty cycle
is not enough to reliably start the fan spinning. The solution is
to spin the fan up for a predetermined time, and once the fan
has spun up, its running speed may be reduced in line with the
temperature being measured.
The ADM1030 allows fan spin-up times between 200 ms and
8 seconds. Bits <2:0> of Fan Characteristics Register 1 (Register
0x20) program the fan spin-up time.
–12–
REV. 0

12 Page





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