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CAT1232LPZ-GT3 データシート(PDF) 6 Page - Catalyst Semiconductor |
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CAT1232LPZ-GT3 データシート(HTML) 6 Page - Catalyst Semiconductor |
6 / 12 page CAT1232, CAT1832 WATCHDOG TIMER AND ST ¯¯ INPUT A watchdog timer stops and restarts a microprocessor that has stopped proper operation or become “hung”. The watchdog performs this function by monitoring the ST ¯¯ input. After the reset outputs go inactive the ST ¯¯ input must be strobed with a high-to-low signal transition prior to the minimum watchdog timeout period. However if the ST ¯¯ input is not strobed with a high-to-low signal transition prior to a watchdog timeout the reset outputs will become active for TRST reseting and restarting the microprocessor. Once the resets return to the inactive state the watchdog timer restarts the process. Watchdog Time-out Period (ms) TD Voltage Level MIN NOMINAL MAX GND 62.5 150 250 Floating 250 600 1000 V 500 1200 2000 CC PBRST 3.3V 1 VCC TD 2 ST TOL CAT1832 µP 3 4 RESET GND 8 7 6 5 RESET RESET I/O The TD input allows the user to select from three predetermined watchdog timeout periods. Always use the minimum timeout period to determine the required frequency of ST ¯¯ high-to-low transitions and the maximum to determine the time prior to the reset outputs becoming active. ST ¯¯ pulse widths must be 20ns or greater. Figure 4. CAT1832 Application Circuit: Pushbutton Reset The watchdog timer cannot be disabled. It must be strobed with a high-to-low signal transition to avoid a watchdog timeout and subsequent reset. Figure 5. CAT1232LP Application Circuit: Watchdog Timer PBRST 5V 1 10k VCC TD 2 ST TOL CAT1232LP µP Decoder 3 4 RESET GND 8 7 6 5 RESET MREQ Address Bus RESET Figure 6. Timing Diagram: Pushbutton Reset VIH VIL VOH VOL RESET RESET PBRST tPDLY tPB tRST RESET RESET ST Valid Strobe Valid Strobe Invalid Strobe tRST tST tTD (Min) tTD (Min) Note: ST is ignored whenever a reset is active Figure 7. Timing Diagram: Strobe Input Doc. No. MD-3018 Rev. D 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice |
同様の部品番号 - CAT1232LPZ-GT3 |
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同様の説明 - CAT1232LPZ-GT3 |
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