TC642COA Microchip Technology, TC642COA Datasheet - Page 16

• Manufacturer Part Number: TC642COA
• Description: IC PWM FAN SPEED CONTRLR 8-SOIC
• Manufacturer: Microchip Technology
• Type: Controller - PWM Fanr

Specifications of TC642COA

• Package / Case: 8-SOIC (3.9mm Width)
• Operating Temperature: 0°C ~ 70°C
• Applications: Fan Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Product: Fan / Motor Controllers / Drivers
• Operating Supply Voltage: 6 V
• Supply Current: 1 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TC642
5.8
In a system containing a microcontroller or other host
intelligence, the TC642 can be effectively managed as
a CPU peripheral. Routine fan control functions can be
performed by the TC642 without processor 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 complementary port bits I/O1
through I/O3. Resistors R
form a crude 3-bit DAC that translates the 3-bit code
FIGURE 5-10:
DS21444C-page 16
Data from one or
Analog or Digital
more Sensors
Temperature
TC642 as a Microcontroller
Peripheral
+5V
GND
Microcontroller
TC642 as a Microcontroller Peripheral.
Open-drain
Outputs
Outputs
CMOS
CMOS
1
through R
I/O2
I/O3
I/O0
I/O1
INT
(MSB)
(RESET)
(LSB)
6
(5% tolerance)
+5V
110 k
240 k
360 k
1.5 k
(Optional)
R
R
R
1
2
3
1 k
R
5
R
6
18 k
R
4
+5V
.01 F
18 k
33 k
C
from the processor's outputs into a 1.6V DC control sig-
nal. 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/O0) can be used to reset
the TC642 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.
B
R
R
8
7
MIN
.01 F
+
1 F
C
B
4
2
3
1
set to 1.8V, the TC642 has a minimum
V
GND
V
C
IN
MIN
F
TC642
SENSE
FAULT
V
V
OUT
2002 Microchip Technology Inc.
DD
8
1 F
6
5
7
+5V
C
B
0.1 F
+5V
10 k
+
R
800
10
R
9
+12V
Fan
2N2222A
2.2
R
11