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TC6501P065VCTTR Folha de dados(PDF) 6 Page - Microchip Technology |
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TC6501P065VCTTR Folha de dados(HTML) 6 Page - Microchip Technology |
6 / 17 page TC6501/2/3/4 DS21451D-page 6 2004 Microchip Technology Inc. 4.0 DETAILED DESCRIPTION The TC6501/2/3/4 integrate a temperature sensor with a factory-programmed threshold switch (see Functional Block Diagrams in Figure 5-4 through Figure 5-7). A logic signal is asserted when the die temperature crosses the factory-programmed threshold. An external hysteresis input pin allows the user to select either 2°C or 10°C hysteresis to give further flexibility to the design of the application. The TC6501 and TC6502 are intended for a temperature range of 35°C to 125°C in 10°C increments. The TC6501 has an open-drain output, while the TC6502 has a push-pull output stage. The TC6503 and TC6504 are intended for a cold temperature range of -45°C to +15°C in 10°C increments. The TC6503 has an open-drain output, while the TC6504 has a push/pull output stage. The TC6501 and TC6503 are intended for applications with a microcontroller reset input. The TC6502 and TC6504 are intended for applications where a fan or heater element is turned on. Please contact Microchip Technology for the availabil- ity of a particular temperature threshold not included in Table 4-1. 4.1 Hysteresis Input To prevent the output from “chattering” at or near the trip point temperature, a selectable HYST input pin is provided. Hysteresis can be externally selected at 2°C (HYST = GND) or 10°C (HYST = VCC) by means of the CMOS compatible HYST input pin. Do not let the HYST pin float, as this could cause an increase in supply current. The hysteresis does not depend on the part’s programmed trip threshold. TABLE 4-1: FACTORY-PROGRAMMED THRESHOLD RANGE 4.2 Thermal Considerations With a 17 µA typical supply current, the TC6501/2/3/4 dissipates very little power. Thus, the die temperature is basically the same as the package temperature. To minimize the error in temperature readings, the load current should be limited to a few milliamps. For example, the typical thermal resistance of a 5-Pin SOT- 23A package is 140°C/W. If, for instance, the TC6501 had to sink 1 mA, and the output voltage is ensured to be less than 0.3V, an additional 0.3 mW of power is dissipated within the temperature sensor. This corresponds to a 0.042°C rise in die temperature. Temperature-monitoring accuracy depends on the thermal resistance between the device being monitored and the temperature switch die. Heat flows primarily through the leads onto the die. Pin 2 provides the lowest thermal resistance to the die. To achieve the best temperature-monitoring results, the TC6501/2/3/4 should be placed closest to the device being monitored. Additionally, a short and wide copper trace from pin 2 to the device should be used. In some cases, the 5-Pin SOT-23A package can be placed directly under the socketed microcontroller for improved ther- mal contact. Part Number Threshold (TTH) Range TC6501 +35°C < TTH < +125°C TC6502 +35°C < TTH < +125°C TC6503 -45°C < TTH < +15°C TC6504 -45°C < TTH < +15°C |
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