TC642DEMO Microchip Technology, TC642DEMO Datasheet - Page 10

• Manufacturer Part Number: TC642DEMO
• Description: DEMO BOARD FOR TC642/46/47/48/49
• Manufacturer: Microchip Technology

Specifications of TC642DEMO

• Processor To Be Evaluated: TC642 and TC646
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

FIGURE 2-1:
2.2
FIGURE 2-2:
DS21401C-page 6
7
SYSTEM CONNECTION FOR +5V OPERATION
C
7
R
5
Q
Power Supply
1
Q
3
R
6
2.1.2
Substituting a logic level MOSFET for Q
voltage losses and significantly reduces output loading on the TC64X and TC64XB
devices. The low R
used instead of the Darlington configuration in high-current fan applications. Refer to
the Applications section of the TC64X and TC64XB data sheets for details.
Population options for single transistor output drivers (using either MOSFET or bipolar
transistor) and the two transistor (Darlington) stage are shown in Figure 2-1.
Output Driver Configuration Options
Figure 2-2 shows typical wiring connections to the fan control module. The fan
operating voltage is +12V, while the fan control module operates from a supply voltage
of +5V. A NTC thermistor connects from the SENSOR input of the fan control module
to V
characteristics of the NTC thermistor, determine the fan speed versus the temperature
profile of the system.
Typical Wiring Connections to Fan Module for +12V Fan and +5V Module Supply
Q
3
C
B
E
+12V
GND
(2N2222A)
DD
+5V
To Fan (–)
. Fan control module resistors R
Q
2
R
Using Logic Level MOSFETS
Reverse Orientation of
5
Q
Thermistor
3
and Jumper R
NTC
7
DSON
Jumper
C
R
7
5
+
of the MOSFET (1 in the case of the BS170) enables it to be
Q
Fan
1
Shutdown
Q
5
3
System
R
6
Q
3
D
G
(BS170)
S
1
Q
To Fan (–)
3
2
and R
(such as a BS170) results in lower system
R
5
2
(See Figure A-2), in conjunction with
V
SENSOR
V
FAULT
FAN(–)
GND
AS
DD
Q
7
1
/V
, Q
R
MIN
2
5
C
= 2N2222A
7
TC64X/TC64XB
Q
1
Fan Control
2003 Microchip Technology Inc.
Q
Q
Module
3
Demo
1
C
B
E
R
Q
6
2
Q
2
C
E
B
To Fan (–)
R
5