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Figure 2-3. Jumper J306, controlling supply voltage of the DB101.
It is possible to sense whether the mega1281 runs from external supply or from
battery as these voltages sources are connected to internal ADC of the mega1281.
The ADC channels 0 to 4 (pins F0 to 4) are connected to various parts of the power
supply network. Please refer to the schematics for more details on these connections.
2.6 Communication interfaces
To be able to interface other application boards, e.g. by piggy-backing the DB101 on
another application board, level converters are placed on all communication
interfaces. This means that not only can the DB101 be supplied from another
application board, but it can also communicate with it regardless of the logic levels of
the application board.
All communication interfaces are available on 2.54mm pin headers on the backside of
the DB101. The supply pins (VEXT and GND) on the communication pin headers
must be connected to the application board voltage supply for the level converters to
work.
Figure 2-4. Communication headers – backside view.
4
AVR481
8073B-AVR-09/07
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