TC07VOA データシートの表示（PDF） - Microchip Technology

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TC07VOA

3V Logic Output Temperature Sensor with Programmable Hysteresis

Microchip Technology 

TC07

4.0 TYPICAL APPLICATIONS

4.1 Trip Point Programming

The resistor values required to achieve the desired trip

point temperatures on TSET and HSET are calculated

using the formula below:

Where:

RTRIP = 0.6 x T 2.13

RTRIP = Programming resistor value in Ohms

T = Desired trip point temperature in degrees Kelvin.

For example, to program the TC07 outputs to go active

at 50°C and inactive at 30°C, the RT and RH

programming resistors are calculated as follows:

RT = 0.6 x ((50 + 273.15)2.13) = 132.8kΩ

RH = 0.6 x ((30 + 273.15)2.13) = 115.9kΩ

Resistance values for TSET and HSET can be approxi-

mated using Figure 4-1. Care must be taken to ensure

the HSET programming resistor is a smaller value than

the TSET programming resistor. The temperature

programmed on HSET must be at least 5°C lower than

the temperature value programmed by TSET.

FIGURE 4-1:

250

PROGRAMMING

RESISTOR VALUES VS.

TEMPERATURE

200

150

100

50

-55 -35 -15

5

25 45 65

TEMPERATURE (°C)

85 105 125

4.2 Cooling and Heating Applications

The TC07 can be used to control a DC fan as shown in

Figure 4-2. The fan turns on when the sensed temper-

ature rises above the temperature set at TSET and

remains on until the temperature falls below the tem-

perature set at HSET. The amount of “cooling"

performed by the fan is dependent on the programmed

hysteresis.

Figure 4-3 shows the TC07 acting as a heater thermo-

stat. Circuit operation is identical to that of the cooling

fan application in Figure 4-2.

FIGURE 4-2:

TC07 AS A FAN

CONTROLLER

+2.7 to 5.5V +12V

RT

RH

NC

VDD

HSET

TC07

TSET

NC

OUT

GND

OUT

+

Fan

Logic Level

MOSFET

TSET

HSET

Out

Fan "On"

DS21674C-page 4

© 2005 Microchip Technology Inc.

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