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TPS3813J25DBV Datasheet(PDF) 6 Page - Texas Instruments

No. de pieza TPS3813J25DBV
Descripción Electrónicos  PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
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Fabricante Electrónico  TI [Texas Instruments]
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TPS3813J25DBV Datasheet(HTML) 6 Page - Texas Instruments

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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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