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TC32MCDB Datasheet(PDF) 6 Page - Microchip Technology |
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TC32MCDB Datasheet(HTML) 6 Page - Microchip Technology |
6 / 12 page TC32M DS21402B-page 6 © 2002 Microchip Technology Inc. 3.4 External Override Reset Control A built-in debounce circuit allows a push-button switch (PB) or other electronic signal to be wire-ORed to this pin as an external RESET override control. The external RESET is required to be an active low signal. Internally, this input is timed to provide a minimum RESET pulse width of 500msec. Reference Figure 3-2. FIGURE 3-2: RS PULLED LOW BY PUSH-BUTTON RESET FIGURE 3-3: POWER UP/DOWN RESET TIMING 3.5 Supply Monitor Noise Sensitivity The TC32M is optimized for fast response to negative- going changes in VDD. Systems with an inordinate amount of electrical noise on VDD (such as systems using relays), may require a 0.01 µF bypass capacitor to reduce detection sensitivity. This capacitor should be installed as close to the TC32M as possible to keep the capacitor lead length short. FIGURE 3-4: TC32M HARDWARE CONNECTIONS (R1, R2 CHOSEN TO MEET VSTH,VSTL) PB Closed PB Open RS VIH tRST VIL RS VIL VIH VDD VRST tRST tRPD 5V 5V RESET PO.1 RESET Microcontroller Microprocessor R2,10k Ω Microcontroller Example RESET Decoder Address RESET R1, 10k Ω Microprocessor Example RS TC32M RS TC32M R1, 10k Ω R2, 10k Ω |
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Similar Description - TC32MCDB |
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