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參數(shù)資料
| 型號： | TPS3813L30DBVT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO6 |
| 封裝： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 536K |
| 代理商： | TPS3813L30DBVT |
Window Frame to Reset the WDI
tboundary, min
tboundary, max
tboundary, typ
Detection of
Rising Edge
WDI
t
twindow, min
twindow, typ
twindow, max
SLVS331E – DECEMBER 2000 – REVISED OCTOBER 2010
www.ti.com
DETAILED DESCRIPTION
IMPLEMENTED WINDOW-WATCHDOG SETTINGS
There are two different ways to set up the watchdog window. The first way is to use the implemented timing
which is a default setting. Or, the default settings can be activated by wiring the WDT and WDR pin to VDD or
GND. There is a total of four different timings available with these settings. They are listed in the table below.
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 = 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
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 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 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 6, it cannot be predicted if the device will detect 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 6. Upper and Lower Boundary Visualization
TIMING RULES OF WINDOW-WATCHDOG
After the reset of the supervisor is released, the lower boundary of the first WDI window is disabled. However,
after the first WDI pulse low-to-high transition is detected, the lower boundary function of the window is enabled.
All further WDI pulses will need to fit into the configured window frame.
8
Copyright 2000–2010, Texas Instruments Incorporated
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