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TC1041CEUA Folha de dados(PDF) 5 Page - Microchip Technology |
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TC1041CEUA Folha de dados(HTML) 5 Page - Microchip Technology |
5 / 14 page © 2002 Microchip Technology Inc. DS21346B-page 5 TC1041 4.0 TYPICAL APPLICATIONS The TC1041 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 Precision Battery Monitor Figure 4-1 is a precision battery low/battery dead monitoring circuit. Typically, the battery low output warns the user that a battery dead condition is imminent. Battery dead typically initiates a forced shutdown to prevent operation at low internal supply voltages (which can cause unstable system operation). The circuit in Figure 4-1 uses a TC1034, a TC1041 and only six external resistors. AMP 1 is a simple buffer while CMPTR1 and CMPTR2 provide precision voltage detection using VREF as a reference. Resistors R2 and R4 set the detection threshold for BATT LOW while Resistors R1 and R3 set the detection threshold for BATT FAIL. The component values shown assert BATT LOW at 2.2V (typical) and BATT FAIL at 2.0V (typical). Total current consumed by this circuit is typically 16 µA at 3V. Resistors R5 and R6 provide hysteresis of 116mV for both comparators. FIGURE 4-1: PRECISION BATTERY MONITOR VDD VDD VDD R2, 430k, 1% R4, 470k, 1% R3, 470k, 1% R1, 300k, 1% VREF To System DC/DC Converter 3V Alkaline TC1041 BATTFAIL BATTLOW CMPTR1 + – CMPTR2 + – AMP1 + – + TC1034 TC1041 TC1041 HYST 51k R6 R5 1M |
Nº de peça semelhante - TC1041CEUA |
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Descrição semelhante - TC1041CEUA |
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