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TPS3813I50QDBVRQ1 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS3813I50QDBVRQ1 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 21 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 TPS3813K33-Q1, TPS3813I50-Q1 SPRS288D – MAY 2008 – REVISED JUNE 2015 www.ti.com 7.3 Feature Description 7.3.1 Implemented Window-Watchdog Settings The watchdog window can be set up in two different ways. The first way is to use the implemented timing, which is a default setting. The other way is to activate the default settings by wiring the WDT and WDR pin to VDD or GND. Four different timings available with these settings which are listed in Table 1. Table 1. Window-Watchdog Configuration Settings SELECTED OPERATION MODE WINDOW FRAME LOWER WINDOW FRAME Max = 0.3 s Max = 9.46 ms WDR = 0 V Typ = 0.25 s Typ = 7.86 ms Min = 0.2 s Min = 6.27 ms WDT = 0 V Max = 0.3 s Max = 2.43 ms WDR = VDD Typ = 0.25 s Typ = 2 ms Min = 0.2 s Min = 1.58 ms Max = 3 s Max = 93.8 ms WDR = 0 V Typ = 2.5 s Typ = 78.2 ms Min = 2 s Min = 62.5 ms WDT = VDD Max = 3 s Max = 23.5 ms WDR = VDD Typ = 2.5 s Typ = 19.6 ms Min = 2 s Min = 15.6 ms See Figure 6 to visualize the values named in the table. Table 1 describes 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 should be retriggered to avoid a timeout condition or a boundary violation in the event of a trigger pulse in the lower boundary. The values in Table 1 are typical and worst case conditions. These values are valid over the whole temperature range of –40°C to 125°C. The shaded area shown in Figure 6 cannot be predicted if the device detects a violation or not and releases a reset. This case is also true for the area between the boundary tolerance of tboundary,min and tboundary,max as well as between twindow,min and twindow,max. Setting up the trigger pulses accordingly to avoid violations in these areas is important. Figure 6. Upper and Lower Boundary Visualization 8 Submit Documentation Feedback Copyright © 2008–2015, Texas Instruments Incorporated Product Folder Links: TPS3813K33-Q1 TPS3813I50-Q1 |
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