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TPS3813K33DBVRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS3813K33DBVRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page Window Frame to Reset the WDI tboundary, min tboundary, max tboundary, typ Detection of Rising Edge WDI t twindow, min twindow, typ twindow, max 11 TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50 www.ti.com SLVS331H – DECEMBER 2000 – REVISED JULY 2016 Product Folder Links: TPS3813J25 TPS3813L30 TPS3813K33 TPS3813I50 Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated 8.5 Programming 8.5.1 Implementing Window-Watchdog Settings There are two ways to configure the watchdog timer window the most flexible is to connect a capacitor to WDT to set the upper boundary of the window watchdog while connecting WDR to either VDD or GND, thus setting the lower boundary. The other way to configure the timing is by wiring the WDT and WDR pin to either VDD or GND. By hardwiring the pins to either VDD or GND there are four different timings available; these settings are listed in Table 2. Table 2. Cap-Free Timer Settings SELECTED OPERATION MODE WINDOW FRAME LOWER WINDOW FRAME WDT = 0 V WDR = 0 V Max = 0.3 s Max = 9.46 ms Typ = 0.25 s Typ = 7.86 ms Min = 0.2 s Min = 6.27 ms WDR = VDD Max = 0.3 s Max = 2.43 ms Typ = 0.25 s Typ = 2 ms Min = 0.2 s Min = 1.58 ms WDT = VDD WDR = 0 V Max = 3 s Max = 93.8 ms Typ = 2.5 s Typ = 78.2 ms Min = 2 s Min = 62.5 ms WDR = VDD Max = 3 s Max = 23.5 ms Typ = 2.5 s Typ = 19.6 ms Min = 2 s Min = 15.6 ms To visualize the values named in the table, a timing diagram was prepared. It is used to describe the upper and lower boundary settings. For an application, the important boundaries are the tboundary,max and twindow,min. Within these values, the watchdog timer must be retriggered to avoid a time-out condition or a boundary violation in the event of a trigger pulse in the lower boundary. The values in the table above are typical and worst-case conditions. They are valid over the whole temperature range of –40°C to +85°C. In the shaded area of Figure 7, it cannot be predicted if the device detects a violation or not and release a reset. This is also the case between the boundary tolerance of tboundary,min and tboundary,max as well as between twindow,min and twindow,max. It is important to set up the trigger pulses accordingly to avoid violations in these areas. Figure 7. Upper and Lower Boundary Visualization 8.5.2 Programmable Window-Watchdog by Using an External Capacitor The upper boundary of the watchdog timer can be set by an external capacitor connected between the WDT pin and GND. Common consumer electronic capacitors can be used to implement this feature. They must have low ESR and low tolerances because the tolerances have to be considered if the calculations are performed. The first formula is used to calculate the upper window frame. After calculating the upper window frame, the lower boundary can be calculated. As in the last example, the most important values are the tboundary,max and twindow,min. The trigger pulse has to fit into this window frame. The external capacitor must have a value between a minimum of 155 pF and a maximum of 63 nF. |
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