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TC623CEOA Datasheet(PDF) 4 Page - Microchip Technology |
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TC623CEOA Datasheet(HTML) 4 Page - Microchip Technology |
4 / 12 page TC623 DS21441C-page 4 © 2006 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION 3.1 TC623 Operation The TC623 has a positive temperature coefficient (Silicon) temperature sensor and dual threshold detec- tor. Temperature set point programming is accom- plished with external resistors from the HIGH SET and LOW SET inputs to VCC. The HIGH LIMIT and LOW LIMIT outputs remain inactive (low) as long as the measured temperature is below set point values. As temperature increases, the LOW LIMIT is driven high when temperature equals the LOW LIMIT set point (±3°C). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH LIMIT set point (±3°C). Figure 3-1 shows the relationship between the sense resistance values and trip point temperature. FIGURE 3-1: TC623 SENSE RESISTORS VS. TRIP TEMPERATURE The CONTROL output is driven high when the HIGH LIMIT output goes high and is RESET low when the LOW LIMIT output goes low. This output provides the logic for simple ON/OFF fan control. Figure 3-2 shows overall TC623 operation. FIGURE 3-2: TC623 TEMPERATURE VS. OUTPUT To prevent output “chattering” when measured temper- ature is at (or near) the 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 temperature falls a maximum of 2°C below the programmed HIGH SET and LOW SET thresholds as shown in Figure 3-3. The programmed setting threshold of Figure 3-3 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 set point value (to within 3°C). The output remains active until the temperature falls an additional 2°C below the set point due to hysteresis. FIGURE 3-3: HIGH SET AND LOW SET THRESHOLDS TEMPERATURE (°C) -55 -35 -15 5 25 45 65 85 105 125 50 100 150 200 250 Low Set Point High Set Point Low Limit Output High Limit Output Control Output (Cool Option) Temperature Programmed Setpoint -2°C Hysteresis High Limit or Low Limit Ouput |
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