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TC650/TC651
4.6
Temperature Selection Guide
Table 4-2 shows the device codes that specify the T H
(Minimum Fan Speed/Full Speed)
There are two temperature thresholds that determine
the characteristics of the device. The minimum fan
speed temperature (T L ) and the full fan speed temper-
ature (T H ). Depending on the TC65X device selected,
when the temperature is below the T L trip point, the
PWM output will perform a different operation. For the
TC650, the PWM will be driven at the minimum PWM
frequency, while the TC651 will shut down the PWM
(PWM = L).
T L and T H can be selected in 5°C increments. T L can
and T L temperature thresholds. The following exam-
ples are given to assist in understanding the device-
ordering nomenclature.
Example 1: Suppose you wanted the fan to run at
40% speed at 25 ° C or less and go to full-
speed at 45 ° C. You would order the part
number TC650AEVUA.
Example 2: Suppose you wanted the fan to turn on at
30 ° C and go to full speed at 45 ° C. You
would order the part number
TC651BEVUA.
range from 25°C to 35°C. T H can range from 35°C to
55°C and must be 10°C (or more) than the specified T L .
The five temperature regions defined by the six
thresholds are defined in the TC650/TC651 by means of
TABLE 4-2:
DEVICE CODES FOR
TEMPERATURE
THRESHOLDS
factory trimming. Once a T L and T H are set, the T 1 – T 4
thresholds are automatically equally spaced between T L
and T H . Table 4-1 shows these 5 regions and what the
corresponding PWM duty cycle is.
Temp.
Threshold
Difference
10°C
T L
25
T H
35
Threshold
Limits Code
AC (1)
TABLE 4-1:
Temperature
TEMPERATURE RANGE
DEFINITION
PWM Duty Cycle
15°C
30
35
25
30
40
45
40
45
BD (2)
CE (2)
AD (2)
BE (1)
(T = T J )
(Note 1)
T < T L
T L < = T < T 1
T 1 < = T < T 2
T 2 < = T <T 3
T 3 < = T < T 4
T 4 < = T < T H
T H < = T < T OV
TC650
(Minimum
Speed mode)
40%
50%
60%
70%
80%
90%
100%
TC651
(Auto-shutdown
mode)
Off
50%
60%
70%
80%
90%
100%
20°C
30°C
Note 1:
2:
35 50 CF (2)
25 45 AE (1)
30 50 BF (2)
35 55 CG (1)
25 55 AG (1)
This temperature threshold option is
available for ordering.
This is a custom temperature threshold
option. Please contact the factory for
more information.
T OV < = T
100% with Overtemperature Alert
(T OVER = L)
Note 1:
The temperature regions defined by the
six temperature thresholds are pre-
defined in the TC650/TC651 by means of
factory trimming. Once a T L and T H are
programmed, the T 1 – T 4 thresholds are
automatically equally spaced between T L
and T H .
DS21450C-page 8
? 2004 Microchip Technology Inc.
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