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TPS3813I50QDBVRQ1 Datasheet(PDF) 8 Page - Texas Instruments

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Part # TPS3813I50QDBVRQ1
Description  Processor Supervisory Circuits With Window-Watchdog
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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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
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Copyright © 2008–2015, Texas Instruments Incorporated
Product Folder Links: TPS3813K33-Q1 TPS3813I50-Q1


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