TC6501/2/3/4
5.0 APPLICATIONS
The TC6501 and TC6503 have open-drain outputs and
are, therefore, intended to interface as microcontroller
The TC6504, with its push-pull output, may be used in
a similar fashion to turn on a heater element at cold
temperatures (see Figure 5-3).
reset inputs. Moreover, the combination of these two
devices can be used to implement a temperature
+5V
12V
window alarm by wire-ORing the outputs and using an
external pull-up resistor (see Figure 5-1).
+5V
100 pF
V CC
TC6504
Heater
100 pF
R PULL-UP
100 k ?
100 pF Temperature
Out of Range
GND
T UNDER
GND HYST
V CC
V CC
TC6501
T OVER
GND GND HYST
TC6503
T UNDER
GND GND HYST
Temperature
T UNDER + 2°C
FIGURE 5-1:
Temperature Alarm.
Over and Under
T UNDER
Time
The TC6502 can be used to control a DC fan. The fan
turns on when the sensed temperature rises above the
factory-set threshold and remains on until the
temperature falls below threshold minus the hysteresis
selected. An additional fail-safe measure could be
designed by using a second TC6502 with a higher
T UNDER
Heater "On"
temperature threshold to alert the user of an impending
thermal shutdown, should the temperature continue to
rise (see Figure 5-2).
+5V
V CC
FIGURE 5-3:
Thermostat.
TC6504 As Heater
T T OVER
GND
100 pF
TC6502PO65
OVER
GND HYST
Temperature
Fault
V CC
T OVER
Fan Control
100 pF
FIGURE 5-2:
Temperature Alert.
HYST
TC6502PO45
GND GND
Fan Control with Over
? 2004 Microchip Technology Inc.
DS21451D-page 7
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