전자부품 데이터시트 검색엔진 |
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TC622VAT 데이터시트(PDF) 5 Page - Microchip Technology |
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TC622VAT 데이터시트(HTML) 5 Page - Microchip Technology |
5 / 14 page © 2006 Microchip Technology Inc. DS21440C-page 5 TC622/TC624 3.0 DETAILED DESCRIPTION 3.1 Trip Point Programming When the temperature of the device exceeds the pro- grammed temperature trip point, TSET, the OUT and OUT outputs are driven into their active states. The desired trip point temperature is programmed with a single external resistor connected between the TSET input and VCC. The relationship between the resistor value and the trip point temperature is given by Equation 3-1. EQUATION 3-1: For example, as shown in Figure 3-1, to program the device to trip at 50°C, the programming resistor is: FIGURE 3-1: Programming Resistor Values vs. Temperature 3.2 Hysteresis To prevent output “chattering” at the trip point tempera- ture, the temperature detector in the TC622/TC624 has 2°C hysteresis (see Figure 3-2). The outputs are driven active when the temperature crosses the set point determined by the external resistor. As temperature declines below the set point, the hysteresis action will hold the outputs true until the temperature drops 2°C below the threshold. FIGURE 3-2: TC622/TC624 Hysteresis RTRIP = 0.5997 x T 2.1312 Where: RTRIP = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. RTRIP = 0.5997 x ((50 + 273.15) 2.1312) = 133.65 k Ω TEMPERATURE (°C) -55 -35 -15 5 25 45 65 85 105 125 50 100 150 200 250 Set Point Temperature OUT (Set Point – 2 Degrees C) OUT |
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