參數(shù)資料
型號： TC649VUATR
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO8
封裝： PLASTIC, MSOP-8
文件頁數(shù)： 8/28頁
文件大?。?/td> 478K
代理商： TC649VUATR
TC649
DS21449C-page 16
2002 Microchip Technology Inc.
5.8
TC649 as a Microcontroller
Peripheral
In a system containing a microcontroller or other host
intelligence, the TC649 can be effectively managed as
a CPU peripheral. Routine fan control functions can be
performed by the TC649 without processor interven-
tion. 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 complementary
port bits I/O1 through I/O3. Resistors R1 through R6
(5% tolerance) form a crude 3-bit DAC that translates
this 3-bit code from the 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 VAS set at 1.8V, the TC649 enters auto-shutdown
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/O0) can be used to reset the TC649
following detection of a fault condition. The FAULT out-
put can be connected to the processor's interrupt input
or to another I/O pin for polled operation.
.
FIGURE 5-10:
TC649 as a Microcontroller Peripheral.
FIGURE 5-11:
VRELEASE vs. Temperature.
CMOS
Microcontroller
TC649
VIN
CF
VAS
GND
VDD
VOUT
SENSE
+5V
Analog or Digital
Temperature Data from
One or more Sensors
I/O1
I/O2
I/O3
INT
GND
(Optional)
(MSB)
R1
110 k
R2
240 k
R3
360 k
(LSB)
R5
1.5 k
+5V
R6
1 k
R4
18 k
R7
33 k
+5V
R8
18 k
CB
.01F
+
1F
CB
.01 F
CMOS
Outputs
Open-Drain
Output
Fan
+12V
+5V
CB
1 F
R9
800
+5V
R10
10 k
0.1 F
2N2222A
R11
2.2
(RESET)
1
2
3
4
5
6
FAULT
7
8
I/O0
VRELEASE vs. Temperature
V
RELEASE
(V)
0C
25C
TEMPERATURE
85C
VDD = 3.0V
VDD = 4.0V
VDD = 5.0V
VDD = 5.5V
1.0
0.9
0.8
0.7
0.6
0.5
0.4
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