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2 Hardware overview
The BC100 consists of two main parts: the battery charging circuits and circuits
related to the ATmega644 board controller. The battery charger circuits can be used
without interaction with the board controller.
The charger circuits has two AVR ? sockets, one for the ATtiny261/461/861 and on for
ATtiny25/45/85. From factory the kit is delivered with both an ATtiny861 and an
ATtiny85. Both of these can control the buck-converts on the board, but not at the
same time.
The board has three buck-converters: These three have different voltage and current
rating, and can be used depending on the requirements for charging voltage and
current.
The buck-converter outputs are connected to either of the two battery terminals
through relays, which are controlled by the device in the ATtinyx81 socket. This offers
the possibility to use two battery packs with a single charger. This makes it possible
to e.g. replace a depleted battery while running the application from the other battery.
The schematics, bill of material and layout can be found as separate PDF documents
in the ZIP file distributed with this application note.
Figure 2-1. Overview of the BC100.
DC Power (7.5V-40V)
RS232 (ATmega644)
Battery A
38V/5A buck converter
30V/2.5A buck converter
20V/1A buck converter
ATtinyx5 socket
Battery relays
Battery B
Electronic loads
ATtinyx61 socket
DataFlash
ATmega644 board controller
2
AVR451
8088A-AVR-09/07
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