Atmel megaAVR, Getting Started

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megaAVR™ Starter Kit Manual 8-1
Section 8
Brown-Out Detector
The brown-out detector circuit is used to detect voltage drops. If a short glitch occurs in
the power, this circuit ensures that the processor resets properly rather than operating
randomly.
The brown-out detector must be set to the same voltage as the circuit voltage, V
CC
—
3.3V or 5V. For 3.3V operation, jumper JP2 must be removed (jumper open) and for 5V
operation it must be closed.
These values are approximate and may vary with temperature and other factors.
Voltage Operating Voltage Hysteresis
5 Volts 4.5 Volts 200 mV
3.3 Volts 2.9 Volts 200 mV