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參數(shù)資料
| 型號： | TC647VUATR |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 478K |
| 代理商： | TC647VUATR |
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2002 Microchip Technology Inc.
DS21447C-page 15
TC647
FIGURE 5-9:
Design Example.
5.8
TC647 as a Microcontroller
Peripheral
In a system containing a microcontroller or other host
intelligence, the TC647 can be effectively managed as
a CPU peripheral. Routine fan control functions can be
performed by the TC647 without controller intervention.
The microcontroller receives temperature data from one
or more points throughout the system. It calculates a fan
operating speed based on an algorithm specifically
designed for the application at hand. The processor
controls fan speed using complimentary port bits I/O1
through I/O3. Resistors R1 through R6 (5% tolerance)
form a crude 3-bit DAC that translates the 3-bit code
from the controller or processor's outputs into a 1.6V DC
control signal. A monolithic DAC or digital pot may be
used instead of the circuit shown in Figure 5-10.
With VMIN set to 1.8V, the TC647 has a minimum
operating speed of approximately 40% of full rated
speed when the processor's output code is 000[B].
Output codes 001[B] to 111[B] operate the fan from
roughly 40% to 100% of full speed. An open-drain
output from the processor I/O can be used to reset the
TC647 following detection of a fault condition. The
FAULT output can be connected to the processor's
interrupt input, or to an I/O pin, for polled operation (see
FAULT
SENSE
NTC
10 k
@ 25
°C
R1
20.5 k
R2
3.83 k
R5
33 k
R7
800
R6
18 k
R8
10 k
GND
Fan Shutdown
(Optional)
Q1
Q2
+12V
+5V
VDD
VIN
VMIN
VOUT
RSENSE
2.2
CSENSE
0.1 F
C1
1 F
CF
TC647
Fan
CB
0.01 F
+
8
4
6
7
5
2
3
1
System
Fault
CB
0.01 F
CB
1 F
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