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TPS3813J25DBV Datasheet(PDF) 6 Page - Texas Instruments |
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TPS3813J25DBV Datasheet(HTML) 6 Page - Texas Instruments |
6 / 12 page TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50 PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG SLVS331A – DECEMBER 2000 – REVISED APRIL 2001 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) application example A typical application example (see Figure 2) is used to describe the function of the watchdog in more detail. To configure the window watchdog function, two pins are provided by the TPS3813. These pins set the window timeout and ratio. The window watchdog ratio is a fixed ratio, which determines the lower boundary of the window frame. It can be configured in two different frame sizes. 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. 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 NOTES: A. Watchdog window ratio B. Watchdog window ratio C. Watchdog timeout set to typical 2.5 sec D. Watchdog timeout programmed by external capacitor E. Watchdog timeout set to typical 0.25 sec Figure 2. Application Example |
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