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TPS3306-20 датащи(PDF) 4 Page - Texas Instruments

номер детали TPS3306-20
подробное описание детали  DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER FAIL
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS330615Q1, TPS330618Q1, TPS330620Q1, TPS330625Q1, TPS330633Q1
DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER FAIL
SGLS241B − MARCH 2004 − REVISED APRIL 2008
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing diagram
t
t
t
td
td
td
Reset Due to
Power Down
Reset Due to WDI
Reset Due to Power Drop Below VIT−
Reset Due to Power Up
tt(out)
SENSEn
V(nom)
VIT
1.1 V
WDI
1
0
RESET
1
0
Undefined
Behavior
Undefined
Behavior
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
GND
4
I
Ground
PFI
3
I
Power-fail comparator input
PFO
6
O
Power-fail comparator output, open drain
RESET
5
O
Active-low reset output, open drain
SENSE1
1
I
Sense voltage 1
SENSE2
2
I
Sense voltage 2
WDI
7
I
Watchdog timer input
VDD
8
I
Supply voltage
detailed description
watchdog
In a microprocessor- or DSP-based system, it is not only important to supervise the supply voltage, it is also important
to ensure correct program execution. The task of a watchdog is to ensure that the program is not stalled in an indefinite
loop. The microprocessor, microcontroller, or DSP has to typically toggle the watchdog input (WDI) within 0.8 s to
avoid a time-out occurring. Either a low-to-high or a high-to-low transition resets the internal watchdog timer. If the
input is unconnected or tied with a high-impedance driver, the watchdog is disabled and is retriggered internally.


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