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TC623CVOA Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc |
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TC623CVOA Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 3 page 2-27 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 To prevent output "chattering" when measured tem- perature is at (or near) the programmed trip point values, the LOW SET and HIGH SET inputs each have a built-in hysteresis of – 2 °C max. As a result, the HIGH LIMIT and LOW LIMIT outputs remain active until the measured tem- perature falls a maximum of 2 °C below the programmed HIGH SET and LOW SET thresholds as shown in Figure 3. The programmed setting threshold of Figure 3 is user- programmed temperature trip points of either the LOW SET or HIGH SET inputs. The LOW LIMIT or HIGH LIMIT output is driven active when temperature equals the programmed setpoint value (to within 3 °C). The output remains active until the temperature falls an additional 2 °C below the setpoint due to hysteresis. APPLICATIONS Mounting If the TC623 is used to measure the temperature of another device, it is important that the top surface of the TC623 package be in intimate contact with the measured device. Good thermal conductivity and no air space is critical to accurate temperature measurement in applications of this type. Trip Point Programming The resistance values required for the HIGH SET and LOW SET inputs are calculated using the formula below: RTRIP = 0.5997 x T 2.1312 Where Rtrip = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. For example, to program a trip point of 50 °C, the programming resistor is: RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133,652 Ω PROGRAMMED SETPOINT –2 °C HYSTERESIS HIGH LIMIT OR LOW LIMIT OUTPUT Figure 3. High Set and Low Set Thresholds TC623 3V, DUAL TRIP POINT TEMPERATURE SENSOR |
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