SENA HD1100 - Manual (Page 32)

Starter Kit and User Manual for the HelloDevice 1100
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The power for the demo board is supplied from the HelloDevice through Vcc/GND pin of 20-pin I/O interface
connector. Figure 3.4 shows the pin assignment of the HelloDevice I/O interface unit and I/O demo board.
Figure 6.6 shows the circuit diagram of the HelloDevice I/O control board. Users can design their own I/O
hardware in consideration of this diagram.
Use two 20-pin connectors (J1 for the HelloDevice input unit and J2 for the HelloDevice output unit) to connect
the HelloDevice to the I/O demo board. Additionally, the user can connect the demo board to his I/O device by
connecting J3 to the input unit and J4 to the output unit (the HelloDevice J1 is by-pass connected to the J3 of the
demo board and HelloDevice J2 is by-pass connected to the J4 of the demo board.) When J3 and J4 on the demo
board are connected in this way, the I/O demo board included in this Starter Kit can be used to debug user’s I/O
device.