TC648VOA Microchip Technology, TC648VOA Datasheet - Page 15

• Manufacturer Part Number: TC648VOA
• Description: IC PWM FAN SPD CONTRLR SD 8-SOIC
• Manufacturer: Microchip Technology
• Type: Controller - PWM Fanr

Specifications of TC648VOA

• Applications: Fan Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Motor Type: DC Brushless
• No. Of Outputs: 1
• Output Current: 5mA
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: 0°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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

FIGURE 5-8:
5.8
In a system containing a microcontroller or other host
intelligence, the TC648 can be effectively managed as
a CPU peripheral. Routine fan control functions can be
performed by the TC648 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 R
3-bit DAC that translates the 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 5-9.
With V
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 TC648
following detection of a fault condition. The OTF output
can be connected to the processor's interrupt input, or
to another I/O pin, for polled operation.
2002 Microchip Technology Inc.
AS
TC648 as a Microcontroller
Peripheral
set at 1.8V, the TC648 enters auto-shutdown
Shutdown
RESET
1
through R
(Optional)
Open-Drain
Device
Design Example.
6
(5% tolerance) form a crude
+5V
R
20.5 kΩ
R
3.83 k
+5V
1
2
18 k
R
33 k
R
5
6
C
0.01 F
C
0.01 F
@ 25˚C
B
B
10 kΩ
C
1 F
NTC
B
1
3
2
V
V
C
IN
AS
F
C
1 F
B
+5V
V
TC648
DD
8
GND
4
V
OTF
OUT
NC
5
6
7
Thermal
Fault
DS21448C-page 15
R
800
TC648
7
+12V
Fan
Q
1