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ADM1029 Fiches technique(PDF) 7 Page - ON Semiconductor

No de pièce ADM1029
Description  Dual PWM Fan Controller and Temperature Monitor for High Availability Systems
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADM1029 Fiches technique(HTML) 7 Page - ON Semiconductor

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Rev. 1 | Page 7 of 50 | www.onsemi.com
TEMPERATURE
– C
0.05
0.00
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
–0.35
–0.40
–0.45
–0.50
–0.55
–0.60
0
20
40
60
80
85
100
105
120
TPC 13. Local Temperature Error
PRODUCT DESCRIPTION
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 moni-
toring 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.
FUNCTIONAL DESCRIPTION
SERIAL BUS INTERFACE
Control of the ADM1029 is carried out via the serial bus. The
ADM1029 is connected to this bus as a slave device, under the
control of a master device.
The ADM1029 has a 7-bit serial bus address. The four MSBs of
the address are set to 0101. The three LSBs can be set by the
user to give a total of eight different addresses, allowing up to
eight ADM1029s to be connected to a single serial bus segment.
To minimize device pin count and size, the three LSBs are set
using a single pin (ADD, Pin 15). This is an 8-level input whose
input voltage is set by a potential divider. The voltage on ADD
is sampled immediately after power-up and digitized by the
on-chip ADC to determine the value of the 3 LSBs. Since ADD
is sampled only at power-up, any changes made while power is
on will have no effect.
ADM1029
ADD
VCC
GND
R1
R2
Figure 2. Setting the Serial Address
Table I shows resistor values for setting the 3 LSBs of the serial
bus address. The same principle is used to set the voltage on Pin
18 (TMIN/INSTALL), which controls the automatic fan speed
control function, and also tells the ADM1029 how many fans
should be installed, as described later.
If several ADM1029s are used in a system, their ADD inputs
can tap off a single potential divider, as shown in Figure 3.
ADD
ADD
ADD
ADD
ADD
ADD
ADD
ADD
ADDRESS XXXX000
ADDRESS XXXX001
ADDRESS XXXX111
ADDRESS XXXX110
ADDRESS XXXX101
ADDRESS XXXX100
ADDRESS XXXX011
ADDRESS XXXX010
VCC
GND
1.5k
1k
1k
1k
1k
1k
1.5k
ADM1029 #1
ADM1029 #2
ADM1029 #3
ADM1029 #4
ADM1029 #5
ADM1029 #6
ADM1029 #7
ADM1029 #8
Figure 3. Setting Address of up to Eight ADM1029s
ADM1029


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