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TC620XCEPA Datasheet(PDF) 6 Page - Microchip Technology |
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TC620XCEPA Datasheet(HTML) 6 Page - Microchip Technology |
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6 / 20 page  TC620/TC621 DS20001439E-page 6 2001-2015 Microchip Technology Inc. 3.3 Using the TC621 The TC621 operation is similar to that of the TC620, but requires an external NTC thermistor. Use the resis- tance versus temperature curve of the thermistor to determine the values of the programming resistors. Note that the pin numbers for the HIGH SET and LOW SET programming resistors for the TC621 are reversed versus that of the TC620 (i.e., the resistor value on HIGH SET [Pin 2] should always be lower than the one connected to LOW SET [Pin 3]). Also note that the outputs of the TC621 are LOW TRUE when used with an NTC thermistor. 3.4 TC621 Thermistor Selection The TC621 uses an external thermistor to monitor the controlling temperature. A thermistor with a resistance value of approximately 100 k at 25°C is recommended. A temperature set point is selected by picking a resis- tor whose value is equal to the resistance of the therm- istor at the desired temperature. For example, using the data shown in Figure 3-4, a 30 k resistor between HIGH TEMP (Pin 2) and VDD (Pin 8) sets the high temperature trip point at +51°C and a 49 k resistor on LOW TEMP (Pin 3) sets the low temperature trip point to +41°C. FIGURE 3-4: Typical NTC Thermistor. 3.5 TC620/TC621 Outputs Both devices have complimentary output stages. They are rated at a source or sink current of 1 mA maximum. 010 20 30 40 50 100 70 TEMPERATURE (°C) 0 50 60 150 200 250 300 350 |
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