6 AVR2016
3.11 Power Supply The AVRRAVEN can be powered either from batteries or an external 5 to 12 Volts
DC source. The power source is selected by the position of the jumper located
immediately to the right of the LCD (See the figure below for a reference). Polarity
protection is provided when using an external power source.
The AVRRAVEN has been designed to run from two 1.5V LR44 battery cells.
An onboard voltage regulator makes it possible to run power the AVRRAVEN from a
5 to 12 Volts DC source. The external voltage is applied to the two leftmost pins in the
user IO area (J401). The ATmega3290P’s ADC channel 2 is connected to a voltage
divider and the external voltage supply interface. This way it is possible for the
application to monitor the external operating voltage.
8117D-AVR-04/08