User's Manual

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7.4.3 Connections
To reduce cost, we want to avoid a board to board connector.
The daughter board will use the technique of the cut metal holes on the board edge (top view):
Before milling During milling Resulting connections
The connections number is 27, spread over three sides of the board as following:
7.4.4 Mounting on the main board
The daughter board is mounted flat directly on the CPU board.
This means that:
• There is no component on the bottom side of the BTDB
PCB
Metal holes
Gold plating