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PDF ADM1029 Data sheet ( Hoja de datos )
| Número de pieza | ADM1029 | |
| Descripción | Dual PWM Fan Controller and Temperature Monitor for High Availability Systems | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a Dual PWM Fan Controller and Temperature
Monitor for High Availability Systems
ADM1029*
FEATURES
Software Programmable and Automatic Fan Speed
Control
Automatic Fan Speed Control Allows Control
Independent of CPU Intervention after Initial Setup
Control Loop Minimizes Acoustic Noise and Power
Consumption
Remote and Local Temperature Monitoring
Dual Fan Speed Measurement
Supports Backup and Redundant Fans
Supports Hot Swapping of Fans
Cascadable Fault Output Allows Fault Signaling
between Multiple ADM1029s
Address Pin Allows Up to Eight ADM1029s in A System
Small 24-Lead QSOP Package
APPLICATIONS
Network Servers and Personal Computers
Microprocessor-Based Office Equipment
High Availability Telecommunications Equipment
FUNCTIONAL BLOCK DIAGRAM
VCC
PRESENT1
FAULT1
DRIVE1
ADM1029
PWM
CONTROLLER
SERIAL BUS
INTERFACE
SLAVE ADDRESS
REGISTER
FAN 1 STATUS
REGISTER
FAN 1 MIN
SPEED REGISTER
FAN 1 ALARM
SPEED REGISTER
FAN 1 HOT-PLUG
SPEED REGISTER
ADDRESS POINTER
REGISTER
INTERRUPT MASK
REGISTERS
INTERRUPT STATUS
REGISTERS
LIMIT COMPARATOR
VALUE AND LIMIT
REGISTERS
INTERRUPT
MASKING
TACH1
TACH2
PRESENT2
FAULT2
DRIVE2
PWM
CONTROLLER
FAN SPEED
COUNTER
FAN 2 STATUS
REGISTER
FAN 2 MIN
SPEED REGISTER
FAN 2 ALARM
SPEED REGISTER
FAN 2 HOT-PLUG
SPEED REGISTER
G.P. I/O REGISTER
ADC
ANALOG
MUX
REMOTE SENSOR
SIGNAL
CONDITIONING
BANDGAP
REFERENCE
BANDGAP
TEMP SENSOR
SCL
SDA
INT
CFAULT
RESET
GPIO2
AIN1/GPIO1
AIN0/GPIO0
D2+/GPIO6
D2–/GPIO5
D1+/GPIO4
D1–/GPIO3
TMIN/INSTALL
ADD
GND
*Protected by U.S. Patent Numbers 6,255,973 and 6,188,189
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 that
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
1 page  
Typical Performance Characteristics–ADM1029
15
10
5
DXP TO GND
0
DXP TO VCC(3.3V)
–5
–10
–15
–20
0
3.3 10
30
LEAKAGE RESISTANCE – M⍀
100
TPC 1. Remote Temperature Error vs. PC Board Track
Resistance
110
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100 110
MEASURED TEMPERATURE
TPC 4. Pentium® III Temperature Measurement vs.
ADM1029 Reading
4.5
4.0
VIN = 250mV p-p
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5 VIN = 100mV p-p
–1.0
0 1 4 8 12 16 20 50 100 200 300 400 500 600
FREQUENCY – MHz
TPC 2. Remote Temperature Error vs. Power Supply
Noise Frequency
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
–11
–12
–13
–14
–15
–16
1.0
2.2
3.3
4.7
10.0
22.0
DXP – DXN CAPACITANCE – nF
47.0
TPC 5. Remote Temperature Error vs. Capacitance
Between D+ and D–
10
9
8 VIN = 100mV p-p
7
VIN = 60mV p-p
VIN = 40mV p-p
6
5
4
3
2
1
0
–1
0 0.4 0.8 10 50 100 150 200 250 300 350 400 450 500 550 600
FREQUENCY – MHz
TPC 3. Remote Temperature Error vs. Common-Mode
Noise Frequency
80
70 VCC = 5V
60
50
40
30
20
VCC = 3.3V
10
0
01
5 10 25 50 75 100 250 500 750 1000
SCLK FREQUENCY – kHz
TPC 6. Standby Current vs. Clock Frequency
Pentium is a registered trademark of Intel Corporation.
REV. 0
–5–
5 Page 
ADM1029
LAYOUT CONSIDERATIONS
Digital boards can be electrically noisy environments, and care
must be taken to protect the analog inputs from noise, particu-
larly when measuring the very small voltages from a remote diode
sensor. The following precautions should be taken:
1. Place the ADM1029 as close as possible to the remote sens-
ing 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
pickup. Ten mil track minimum width and spacing is
recommended.
GND
D+
D–
GND
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
Figure 6. 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 1°C
corresponds to about 240 µV, and thermocouple voltages are
about 3 µV/oC of temperature difference. Unless there are two
thermocouples with a big temperature differential between
them, thermocouple voltages should be much less than 200 µV.
5. Place 0.1 µF bypass and 1000 pF input filter capacitors close
to the ADM1029.
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. Con-
nect the twisted pair to D+ and D– and the shield to GND
close to the ADM1029. 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 may
be reduced or removed.
Cable resistance can also introduce errors. 1 Ω series resistance
introduces about 0.5°C error.
TEMPERATURE-RELATED REGISTERS
Table III is a list of registers on the ADM1029 that are specific
to temperature measurement and control.
Table III. Temperature-Specific Registers
Address
0x06
0x30
0x31
0x32
0x40
0x41
0x42
0x48
0x49
0x4A
0x80
0x81
0x82
0x88
0x89
0x8A
0x90
0x91
0x92
0x98
0x99
0x9A
0xA0
0xA1
0xA2
Description
Temp Devices Installed
Local Temp Offset
Remote 1 Temp Offset
Remote 2 Temp Offset
Local Temp Fault Action
Remote 1 Temp Fault Action
Remote 2 Temp Fault Action
Local Temp Cooling Action
Remote 1 Temp Cooling Action
Remote 2 Temp Cooling Action
Local Temp TMIN
Remote 1 Temp TMIN
Remote 2 Temp TMIN
Local Temp TRANGE/THYST
Remote 1 Temp TRANGE/THYST
Remote 2 Temp TRANGE/THYST
Local Temp High Limit
Remote 1 Temp High Limit
Remote 2 Temp High Limit
Local Temp Low Limit
Remote 1 Temp Low Limit
Remote 2 Temp Low Limit
Local Temp Value
Remote 1 Temp Value
Remote 2 Temp Value
The flowchart in Figure 7 shows how to configure the ADM1029
to measure temperature. It also shows how to configure the
ADM1029’s behavior for out-of-limit temperature measurements.
FAN INTERFACING
The ADM1029 can be interfaced to many types of fan. It can be
used to control the speed of a simple two-wire fan. It can mea-
sure the speed of a fan with a tach output, and it can accept a
logic input from fans with a FAULT output. By means of a
shorting link in the fan connector it can also determine if a fan is
present or not and if fans have been hot-swapped.
The ADM1029 can control or monitor one or two fans. Bits 0
and 1 of the Fans Supported In System Register (03h) tell the
ADM1029 how many fans it should be controlling/monitoring.
In the following descriptions “installed” means that the corre-
sponding bit of register 03h is set and the ADM1029 expects to
see a fan interfaced to it. It does not necessarily mean that the
fan is actually, physically, connected.
If a fan is installed, events such as a fault output and hot-swapping
of the fan can cause INT and CFAULT to be asserted, unless
they are masked for that particular event. If a fan is not installed,
but is still physically connected to the ADM1029, these events will
be ignored with respect to asserting INT or CFAULT, but will
still be reflected in the corresponding Fan Status Register.
Setting Bit 0 indicates that Fan 1 is installed and is set to 1
at power-up by default. Setting Bit 1 indicates that Fan 2 is
installed and depends on the state of Pin 18 (TMIN/INSTALL)
at power-up.
REV. 0
–11–
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADM1029.PDF ] | |
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