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TC1027CEPR Folha de dados(PDF) 4 Page - Microchip Technology |
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TC1027CEPR Folha de dados(HTML) 4 Page - Microchip Technology |
4 / 18 page TC1027 DS21284B-page 4 © 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1027 is one of a series of very low-power, linear building block products targeted at low-voltage, single- supply applications. The TC1027 minimum operating voltage is 1.8V, and typical supply current is only 18 µA. It combines four comparators and a voltage reference inasinglepackage. 3.1 Comparators The TC1027 contains four comparators. The compara- tor's input range extends beyond both supply voltages by 200mV and the outputs will swing to within several millivolts of the supplies depending on the load current being driven. The comparators exhibit propagation delay and supply current which are largely independent of supply voltage. The low input bias current and offset voltage make them suitable for high impedance precision applications. 3.2 Voltage Reference A 2.0% tolerance, internally biased, 1.20V bandgap voltage reference is included in the TC1027. It has a push pull output capable of sourcing and sinking at least 50 µA. GND (Pin 9) is connected to VSS (Pin 14) through the substrate of the integrated circuit. Large currents can flow between GND and VSS if the pins are not at the same voltage. 4.0 TYPICAL APPLICATIONS The TC1027 lends itself to a wide variety of applications, particularly in battery-powered systems. It Typically it finds application in power management, processor supervisory and interface circuitry. 4.1 External Hysteresis (Comparator) Hysteresis can be set externally with two resistors using positive feedback techniques (see Figure 4-1). The design procedure for setting external comparator hysteresis is as follows: 1. Choose the feedback resistor RC.Since the input bias current of the comparator is at most 100pA, the current through RC canbeset to 100nA (i.e., 1000 times the input bias current) and retain excellent accuracy. The current through RC at the comparator’s trip point is VR/ RC where VR is a stable reference voltage. 2. Determine the hysteresis voltage (VHY) between the upper and lower thresholds. 3. Calculate RA as follows: EQUATION 4-1: 4. Choose the rising threshold voltage for VSRC (VTHR). 5. Calculate RB as follows: EQUATION 4-2: 6. Verify the threshold voltages with these formulas: VSRC rising: EQUATION 4-3: VSRC falling: EQUATION 4-4: R A R C V HY V DD ----------- = R B 1 V THR V R R A × --------------------- 1 R A ------- – 1 R C ------- – ----------------------------------------------------------- = V TH R V R () R A () 1 R A ------- 1 R B ------- 1 R C ------- ++ = V THF V THR R A V DD × R C ------------------------- – = |
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