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TC6501 Datasheet(PDF) 7 Page - Microchip Technology

Part # TC6501
Description  Ultra Small Temperature Switches with Pin Selectable Hysteresis
PDF  17 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC6501 Datasheet(HTML) 7 Page - Microchip Technology

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 2004 Microchip Technology Inc.
DS21451D-page 7
TC6501/2/3/4
5.0
APPLICATIONS
The TC6501 and TC6503 have open-drain outputs and
are, therefore, intended to interface as microcontroller
reset inputs. Moreover, the combination of these two
devices can be used to implement a temperature
window alarm by wire-ORing the outputs and using an
external pull-up resistor (see Figure 5-1).
FIGURE 5-1:
Over and Under
Temperature Alarm.
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
temperature threshold to alert the user of an impending
thermal shutdown, should the temperature continue to
rise (see Figure 5-2).
FIGURE 5-2:
Fan Control with Over
Temperature Alert.
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).
FIGURE 5-3:
TC6504 As Heater
Thermostat.
HYST
VCC
GND
GND
HYST
TUNDER
+5V
RPULL-UP
100 k
Ω
GND GND
VCC
TOVER
TC6501
TC6503
HYST
100 pF
Out of Range
100 pF
HYST
VCC
GND
GND
HYST
TUNDER
GND GND
VCC
TOVER
TC6501
TC6503
HYST
Temperature
GND
GND
100 pF
HYST
+5V
TOVER
VCC
TC6502PO65
GND
GND
HYST
TOVER
VCC
TC6502PO45
Temperature
Fault
Fan Control
GND
GND
HYST
+5V
TOVER
VCC
TC6502PO65
GND
GND
HYST
TOVER
VCC
TC6502PO45
GND
GND
HYST
+5V
TOVER
VCC
TC6502
GND GND
HYST
TOVER
VCC
TC6502
100 pF
Heater "On"
TUNDER
TUNDER
TUNDER + 2°C
TC6504
+5V
12V
GND GND HYST
VCC
Heater
TUNDER
100 pF
Temperature
Time



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