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TPS3813L30DBVTG4 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS3813L30DBVTG4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 16 page www.ti.com VDD RESET WDI WDR WDT GND TPS3813 VDD RESET I/O GND VDD Position 1 See Note A Position 2 See Note B VDD Position 3 See Note C Position 5 See Note E C(ext) Position 4 See Note D VDD 0.1 µF 0.1 µF R uC TPS3813J25, TPS3813L30 TPS3813K33, TPS3813I50 SLVS331B – DECEMBER 2000 – REVISED JUNE 2005 If the window watchdog ratio pin (WDR) is set to VDD, Position 1 in Figure 2, then the lower window frame is a value based on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT) connected to GND, it is a ratio of 1:124.9, for WDT connected to VDD, it is a ratio of 1:127.7, and for an external capacitor connected to WDT, it is a ratio of 1:64.5. If the window watchdog ratio pin (WDR) is set to GND, Position 2, the lower window frame will be a value based on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT) connected to GND, it will be a ratio of 1:31.8, for WDT connected to VDD it will be 1:32, and for an external capacitor connected to WDT it will be 1:25.8. The watchdog timeout can be set in two fixed timings of 0.25 seconds and 2.5 seconds for the window or can by programmed by connecting a external capacitor with a low leakage current at WDT. Example: If the watchdog timeout pin (WDT) is connected to VDD, the timeout will be 2.5 seconds. If the window watchdog ratio pin (WDR) is set in this configuration to a ratio of 1:127.7 by connecting the pin to VDD, the lower boundary is 19.6 ms. A. Watchdog window ratio B. Watchdog timeout set to typical 2.5 sec C. Watchdog timeout programmed by external capacitor D. Watchdog timeout set to typical 0.25 sec Figure 2. Application Example 6 |
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