| Author | Message | < Micro-D/Pascal/Avr ~ EEPROM protection in AVR controllers | | eric | | Posted: Sun Sep 10, 2006 9:23 am Post subject: EEPROM protection in AVR controllers | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | H. Bonekamp
AVR controllers have the unfortunate property of their data EEPROM
being affected when the supply voltage drops below a certain
level, which can, of course, be prevented by making the reset
low in good time to disable the processor. Unfortunately, this
requires a circuit for monitoring the supply voltage and for taking
the requisite action automatically when needed.
This requirement is met by the circuit in the diagram, which
draws a low enough current to enable it being powered by a battery.
The circuit may be split into a detector, T1, and an amplifier,
T2–T3.
The trip voltage of the detector is determined by the values of
R1 and R2. Normally,
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