TC647EUA Microchip Technology, TC647EUA Datasheet - Page 15
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TC647EUA
Manufacturer Part Number
TC647EUA
Description
IC PWM FAN SPEED CTRLR 8-MSOP
Manufacturer
Microchip Technology
Type
Controller - PWM Fanr
Datasheet
1.TC647EUA.pdf
(28 pages)
Specifications of TC647EUA
Applications
Fan Controller, Brushless (BLDC)
Number Of Outputs
1
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Motor Type
PWM
No. Of Outputs
1
Output Current
5mA
Output Voltage
4.4V
Supply Voltage Range
3V To 5.5V
Driver Case Style
MSOP
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Product
Fan / Motor Controllers / Drivers
Operating Supply Voltage
3 V to 5.5 V
Supply Current
1 mA
Mounting Style
SMD/SMT
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Voltage - Load
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
TC647EUATR
Manufacturer:
MICROCHIP
Quantity:
12 000
FIGURE 5-9:
5.8
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 R
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 V
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
Figure 5-10).
Fan Shutdown
2002 Microchip Technology Inc.
MIN
TC647 as a Microcontroller
Peripheral
set to 1.8V, the TC647 has a minimum
(Optional)
10 k
R 8
Design Example.
1
through R
+5V
Q 2
R 1
20.5 k
R 2
3.83 k
+5V
R 6
18 k
R 5
33 k
6
(5% tolerance)
@ 25 C
C
0.01 µF
C
0.01 µF
10 k
NTC
B
C 1
1 µF
B
1
3
2
C
V
V
C
1 µF
F
MIN
IN
B
+
+5V
V
DD
TC647
8
GND
4
SENSE
FAULT
V
OUT
6
7
5
C SENSE
System
0.1 µF
Fault
DS21447C-page 15
R 7
800
TC647
+12V
Fan
Q 1
R SENSE
2.2