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PDF ADM1029 Data sheet ( Hoja de datos )
| Número de pieza | ADM1029 | |
| Descripción | Dual PWM Fan Controller and Temperature Monitor | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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ADM1029
Dual PWM Fan Controller
and Temperature Monitor for
High Availability Systems
The ADM1029 is a versatile fan controller and monitor for use in
personal computers, servers, telecommunications equipment, or any
high-availability system where reliable control and monitoring of
multiple cooling fans is required. Each ADM1029 can control the
speed of one or two fans and can measure the speed of fans that have a
tachometer output. The ADM1029 can also measure the temperature
of one or two external sensing diodes or an internal temperature
sensor, allowing fan speed to be adjusted to keep system temperature
within acceptable limits. The ADM1029 has FAULT inputs for use
with fans that can signal failure conditions, and inputs to detect
whether or not fans are connected.
The ADM1029 communicates with the host processor over an
System Management (SMBus) serial bus. It supports eight different
serial bus addresses, so that up to eight devices can be connected to a
common bus, controlling up to sixteen fans. This makes software
support and hardware design scalable.
The ADM1029 has an interrupt output (INT) that allows it to signal
fault conditions to the host processor. It also has a separate, cascadable
fault output (CFAULT) that allows the ADM1029 to signal a fault
condition to other ADM1029s.
The ADM1029 has a number of useful features including an
automatic fan speed control option implemented in hardware with no
software requirement, automatic use of backup fans in the event of fan
failure, and supports hot-swapping of failed fans.
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
This is a Pb-Free Device*
Applications
Network Servers and Personal Computers
Microprocessor-based Office Equipment
High Availability 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. 2
1
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QSOP 24
CASE 492B
PIN ASSIGNMENT
DRIVE1 1
FAULT1 2
TACH1 3
PRESENT1 4
SCL 5
SDA 6
GND 7
VCC 8
CFAULT 9
INT 10
GPIO2 11
RESET 12
24 DRIVE2
23 FAULT2
22 TACH2
21 PRESENT2
20 AIN1/GPIO1
19 AIN0/GPIO0
18 TMIN/INSTALL
17 D2+/GPIO6
16 D2−/GPIO5
15 ADD
14 D1+/GPIO4
13 D1−/GPIO3
ADM1029
Top View
(Not To Scale)
MARKING DIAGRAM
1029ARQZ
#YYWW
1029ARQZ
#
YYWW
= Special Device Code
= Pb-Free Package
= Date Code
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 49 of this data sheet.
Publication Order Number:
ADM1029/D
1 page  
ADM1029
Table 4. ELECTRICAL CHARACTERISTICS (TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted. (Note 1 and 2))
Parameter
Test Conditions/Comments
Min Typ Max Unit
SERIAL BUS TIMING (Note 5)
Bus Free Time, tBUF
4.7 −
−
Start Setup Time, tSU; STA
4.7 −
−
Start Hold Time, tHD; STA
4.0 −
−
Stop Condition Setup Time, tSU; STO
4.0 −
−
SCL Low Time, tLOW
1.3 −
−
SCL High Time, tHIGH
4.0 − 50
SCL, SDA Rise Time, tR
− − 1,000
SCL, SDA Fall Time, tF
− − 300
Data Setup Time, tSU; DAT
250 −
−
Data Hold Time, tHD; DAT
300 −
−
1. All voltages are measured with respect to GND, unless otherwise specified.
2. Typicals are at TA = 25C and represent the most likely parametric norm. Shutdown current typ is measured with VCC = 3.3 V.
3. Total unadjusted error (TUE) includes offset, gain, and linearity errors of the ADC, multiplexer.
4. The total fan count is based on two pulses per revolution of the fan tachometer output.
5. Timing specifications are tested at logic levels of VIL = 0.8 V for a falling edge and VIH = 2.1 V for a rising edge.
NOTE: Specifications subject to change without notice.
ms
ms
ms
ms
ms
ms
ns
ns
ns
ns
SCL
SDA
tBUF
PS
t LOW
tR
tHD; STA
tHD; DAT
tF
tHIGH
tSU; DAT
t HD; STA
tSU; STA
S
Figure 2. Serial Bus Timing Diagram
tSU; STO
P
TYPICAL PERFORMANCE CHARACTERISTICS
15
10
5
DXP TO GND
0
−5 DXP TO VCC (3.3 V)
−10
−15
−20
0
3.3 10 30 100
LEAKAGE RESISTANCE (MW)
Figure 3. 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
Figure 4. Pentium) III Temperature Measurement
vs. ADM1029 Reading
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5
5 Page 
ADM1029
provided for temperature monitoring on some
microprocessors, but it could equally well be a discrete
transistor.
If a discrete transistor is used, the collector will not be
grounded, and should be linked to the base. If a PNP
I
NI
IBIAS
transistor is used, the base is connected to the D– input and
the emitter to the D+ input. If an NPN transistor is used, the
emitter is connected to the D– input and the base to the D+
input.
VDD
REMOTE
SENSING
TRANSISTOR
D+
D−
BIAS
DIODE
LOW-PASS FILTER
fC = 65 kHz
VOUT+
To ADC
VOUT−
Figure 21. Signal Conditioning for Remote Diode Temperature Sensors
To prevent ground noise interfering with the
measurement, the more negative terminal of the sensor is not
referenced to ground, but biased above ground by an internal
diode at the D– input. If the sensor is used in a noisy
environment, a capacitor of value up to 1000 pF may be
placed between the D+/D– pins.
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, and
to a chopper-stabilized 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 8-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 takes nominally 9.6 ms.
The results of external temperature measurements are
stored in 8-bit, two’s complement format, as illustrated in
Table 6.
Offset Registers
Digital noise and other error sources can cause offset
errors in the temperature measurement, particularly on the
remote sensors. The ADM1029 offers a way to minimize
these effects. The offsets on the three temperature channels
can be measured during system characterization and stored
as two’s complement values in three offset registers at
addresses 30h to 32h. The offset values are automatically
added to, or subtracted from, the temperature values,
depending on whether the two’s complement number
corresponds to a positive or negative offset. Offset values
from –15C to +15C are allowed.
The default value in the offset registers is zero, so if no
offsets are programmed, the temperature measurements are
unaltered.
Temperature Limits
The contents of the Local and Remote Temperature Value
Registers (addresses A0h to A2h) are compared to the
contents of the High and Low Limit Registers at addresses
90h to 92h and 98h to 9Ah. How the ADM1029 responds to
overtemperature/undertemperature conditions depends on
the status of the Temperature Fault Action Registers
(addresses 40h to 42h). The response of CFAULT, INT, and
fan-speed-to-temperature events depends on the setting of
these registers, as explained later.
Table 6. TEMPERATURE DATA FORMAT
Temperature
Digital Output
−128C
−125C
−100C
−75C
−50C
−25C
0C
+10C
+25C
+50C
+75C
+100C
+125C
+127C
1000 0000
1000 0011
1001 1100
1011 0101
1100 1110
1110 0111
0000 0000
0000 1010
0001 1001
0011 0010
0100 1011
0110 0100
0111 1101
0111 1111
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:
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