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EM6151V50SO8B Datasheet(PDF) 7 Page - EM Microelectronic - MARIN SA

Part # EM6151V50SO8B
Description  Low Power Windowed Watchdog with Reset, Sleep Mode Functions
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6151V50SO8B Datasheet(HTML) 7 Page - EM Microelectronic - MARIN SA

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R
EM6151
Copyright © 2005, EM Microelectronic-Marin SA
7
www.emmicroelectronic.com
rev. B / 06.06
Enable - EN Output
The system enable output, EN , is inactive always when
RES
is active and remains inactive after a RES pulse until
the watchdog is serviced correctly 3 consecutive times (i.e.
the TCL pulse must come in the open window). After three
consecutive services of the watchdog with TCL during the
open window, the EN goes active low.
A malfunctioning system would be repeatedly reset by the
watchdog. In a conventional system critical motor controls
could be energized each time reset goes inactive (time
allowed for the system to restart) and in this way the
electrical motors driven by the system could function out of
control. The circuit prevents the above failure mode by using
the EN output to disable the motor controls until software
has successfully cleared the watchdog three times (i.e. the
system has correctly re-started after a reset condition).
Typical Application
Fig. 8
Regulated Voltage (5V)
VSS
GND
VDD
ROSC
EM6151
RES
EN
TCL
VIN
RES
Microprocessor
Motor
controls
EN
Address decoder
R1
R2
100k
Ω


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