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TC1232COA Datasheet(PDF) 8 Page - Microchip Technology |
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TC1232COA Datasheet(HTML) 8 Page - Microchip Technology |
8 / 20 page TC1232 DS21370D-page 8 Preliminary 2002-2012 Microchip Technology Inc. 4.2 Push Button Reset Input The debounced manual reset input (PB RST) manually forces the reset outputs into their active states. Figure 4-5 shows a block diagram for using the TC1232 with a push button switch. Once PB RST has been low for a time tPBD (the push- button delay time), the reset outputs go active. The reset outputs remain in their active states for a minimum of 250 ms after PB RST rises above VIH. Figure 4-6 shows a waveform for the push button switch input and the reset pins output. A mechanical push button or active logic signal can drive the PB RST input. The debounced input ignores input pulses less than 1 ms and recognizes pulses of 20 ms or greater. No external pull-up resistor is required because the PB RST input has an internal pull-up to VCC of approximately 100 µA. FIGURE 4-5: Push Button Reset and Watchdog Timer. FIGURE 4-6: Push Button Reset – PB RST Input. VCC TOL PB RST GND RST ST I/O Reset +5V TC1232 TD Microprocessor RST VIL tPB RST tPBD VIH tRST PB RST The debounced PB RST input ignores input pulses less than 1 ms and is designed to recognize pulses of 20 ms or greater. |
Número de pieza similar - TC1232COA |
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Descripción similar - TC1232COA |
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