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TC1037CECT 데이터시트(PDF) 5 Page - Microchip Technology |
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TC1037CECT 데이터시트(HTML) 5 Page - Microchip Technology |
5 / 18 page © 2002 Microchip Technology Inc. DS21344B-page 5 TC1037/TC1038/TC1039 3.0 DETAILED DESCRIPTION The TC1037/TC1038/TC1039 are a series of very low power, linear building block products targeted at low voltage, single supply applications. The TC1037/ TC1038/TC1039 minimum operating voltage is 1.8V and typical supply current is only 4 µA for the TC1037 and TC1038 (fully enabled) and 6 µA for the TC1039. 3.1 Comparator The TC1037/8/9 contain one comparator. The comparator’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 comparator exhibits a propagation delay and supply current which is largely independent of supply voltage. The low input bias current and offset voltage makes it suitable for high impedance precision applications. The TC1038 comparator is disabled during shutdown and has a high impedance output. 3.2 Voltage Reference A 2.0% tolerance, internally biased, 1.20V bandgap voltage reference is included in the TC1039. It has a push-pull output capable of sourcing and sinking at least 50 µA. 3.3 Shutdown Input (TC1038 Only) SHDN at VIL disables the comparator and reduces the supply current to less than 0.3 µA. The SHDN input cannot be allowed to float. When not used, connect it to VDD. The comparator’s output is in a high impedance state when the TC1038 is disabled. The comparator’s inputs can be driven from rail-to-rail by an external voltage when the TC1038 is disabled. No latchup will occur when the device is driven to its enabled state when SHDN is set to VIH. 4.0 TYPICAL APPLICATIONS The TC1037/TC1038/TC1039 family lends itself to a wide variety of applications, particularly in battery powered systems. It typically 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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