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MCP111 Datasheet(PDF) 11 Page - Microchip Technology |
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MCP111 Datasheet(HTML) 11 Page - Microchip Technology |
11 / 26 page © 2005 Microchip Technology Inc. DS21889D-page 11 MCP111/112 4.0 APPLICATION INFORMATION For many of today’s microcontroller applications, care must be taken to prevent low-power conditions that can cause many different system problems. The most common causes are brown-out conditions, where the system supply drops below the operating level momen- tarily. The second most common cause is when a slowly decaying power supply causes the microcontroller to begin executing instructions without sufficient voltage to sustain SRAM, thus producing indeterminate results. Figure 4-1 shows a typical application circuit. FIGURE 4-1: Typical Application Circuit. 4.1 V TRIP Operation The voltage trip point (V TRIP) is determined on the falling edge of V DD. The actual voltage trip point (VTRIPAC) will be between the minimum trip point (V TRIPMIN) and the maximum trip point (V TRIPMAX). There is a hysteresis on this trip point to remove any “jitter” that would occur on the V OUT pin when the device VDD is at the trip point. Figure 4-2 shows the state of the V OUT pin as determined by the V DD voltage. The VTRIP specification is for falling V DD voltages. When the VDD voltage is rising, the V OUT pin will not be driven high until VDD is at V TRIP + VHYS. FIGURE 4-2: VOUT Operation as Determined by the VTRIP and VHYS. 2 MCP11X VDD VDD VDD VOUT MCLR (Reset Input) VSS GND PICmicro® Microcontroller 3 1 RPU Note 1: RPU may be required with the MCP111 due to the open-drain output. Resistor RPU is not required with the MCP112. 0.1 µF (1) VDD VTRIPMAX VTRIPMIN VTRIPAC VTRIPAC VTRIPAC + VHYSAC VOUT 1V < 1 V is outside the device specifications |
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