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MCP120-485DI Datasheet(PDF) 4 Page - Microchip Technology |
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MCP120-485DI Datasheet(HTML) 4 Page - Microchip Technology |
4 / 16 page MCP120/130 DS11184D-page 4 2001 Microchip Technology Inc. 2.0 APPLICATIONS INFORMATION 2.1 The Need for Supervisory Circuits 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 com- mon causes are brown-out conditions where the sys- tem supply drops below the operating level momentar- ily, and the second, is when a slowly decaying power supply causes the microcontroller to begin executing instructions without enough voltage to sustain SRAM and producing indeterminate results. Figure 2-1: Typical Application 2.2 Negative Going VDD Transients Many system designers implementing POR circuits are concerned about the minimum pulse width required to cause a reset. Figure 2-2 shows typical transient voltage below the trip point (VTRIP - VDD) vs. transient duration. It shows that the farther below the trip point the transient pulse goes, the duration of the pulse required to cause a reset gets shorter. A 0.1 µF bypass cap mounted as close as possible to the VDD pin pro- vides additional transient immunity. Figure 2-2: Typical Transient Response Microcontroller MCLR VSS RST MCP120 or RESET VSS VDD VDD Bypass Capacitor VDD TIME 0 0 5V VTRIP MAX VTRIP MIN Transient Duration (VTRIP MIN - VDD) 01 23 VTRIP - VDD (V) 10 8 6 4 2 0 45 TA = +25°C Transients above the curve will cause a reset Transients below the curve will NOT cause a reset |
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