ADM1029
http://onsemi.com
19
The T
RANGE
parameter actually defines the fan
speed versus temperature slope of the control loop.
3. T
MAX
. This is defined as the temperature at which
a fan will be at its maximum speed. At this
temperature, the PWM duty cycle driving the fan
will be 100%. T
MAX
is given by T
MIN
+ T
RANGE
.
Since this parameter is the sum of the T
MIN
and
T
RANGE
parameters, it does not need to be
programmed into a register on-chip.
4. Programmable hysteresis is included in the control
loop to prevent the fans continuously switching on
and off if the temperature is close to T
MIN
. The
fans will continue to run until such time as the
temperature drops below T
MIN
T
HYST
. The four
MSBs of the T
RANGE
/T
HYST
registers (Registers
0x88, 0x89, 0x8A) contain a temperature
hysteresis value that can be programmed from
0001 to 1111. This allows a temperature hysteresis
range from 1癈 to 15癈 for each temperature
measurement channel.
33
40
47
53
60
66
73
80
87
93
100
Figure 30. PWM Duty Cycle vs. Temperature Slopes
(T
RANGE
)
TEMPERATURE (癈)
T
MAX
= T
MIN
+ T
RANGE
T
MIN
0 5 10 20
40
60
80
A
B
C
D
E
A T
RANGE
= 5癈
B T
RANGE
= 10癈
C T
RANGE
= 20癈
D T
RANGE
= 40癈
E T
RANGE
= 80癈
Figure 30 shows the different control slopes determined
by the T
RANGE
value chosen, and programmed in to the
ADM1029. T
MIN
was set to 0癈 to start all slopes from the
same point. It can be seen how changing the T
RANGE
value
affects the PWM Duty Cycle vs. Temperature Slope.
Figure 31 shows how for a given T
RANGE
, changing the
T
MIN
value affects the loop. Increasing the T
MIN
value will
increase the T
MAX
(temperature at which the fan runs full
speed) value, since T
MAX
= T
MIN
+ T
RANGE
. Note,
however, that the PWM Duty Cycle versus Temperature
slope remains exactly the same. Changing the T
MIN
value
merely shifts the control slope.
33
40
47
53
60
66
73
80
87
93
100
Figure 31. Effect of Increasing T
MIN
Value on Control
Loop
TEMPERATURE (癈)
T
MAX
= T
MIN
+ T
RANGE
T
MIN
0 5 10 20
40
60
80
A
A T
RANGE
= 40癈
B T
RANGE
= 40癈
C T
RANGE
= 40癈
B
C
Fan Spin-up
As previously mentioned, once the temperature being
measured exceeds the T
MIN
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 ADM1029 allows fan spin-up times between 1/64
second and 16 seconds. The Fan Spin-up Register (Register
0x0C) allows the spin-up time for the fans to be
programmed. Bit 3 of this register, when set, disables fan
spin-up for both fans.
Table 10. FAN SPIN-UP TIMES
Bits 2:0
Spin-up Times
(Fan Spin-up Register)
000
16 Seconds
001
8 Seconds
010
4 Seconds
011
2 Seconds (Default)
100
1 Second
101
1/4 Second
110
1/16 Second
111
1/64 Second
Once the Automatic Fan Speed Control Loop parameters
have been chosen, the ADM1029 device may be
programmed. The ADM1029 is placed into Automatic Fan
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