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EM6151V50SO8B Datasheet(PDF) 7 Page - EM Microelectronic - MARIN SA |
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EM6151V50SO8B Datasheet(HTML) 7 Page - EM Microelectronic - MARIN SA |
7 / 10 page 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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