– –
14
Supply for the module is connected through R17. This can be removed and
replaced by another supply or used to measure the current consumption of
the module.
Figure 13 shows the bottom of the board.
SW1 and SW2 connect the USB interface to the Command Data Interface
lines on the module. This allows the prototype board to be used with the
development kit software or a custom application. When in the “USB
Connected position”, the module is connected to the USB interface. The
“Header Only” position connects the module to the header. The prototype
board is shipped with the switches in the “Header Only” position.
Footprints for 0603 size resistors are on most lines so that pull-ups or
pull-downs can easily be added to the lines. The pads are connected to
V
CC
or GND based on the most common configuration for the module. The
schematic at the end of this document shows how each line is connected.
Note:
The onboard 3.3-volt regulator has approximately 400mA
available for additional circuitry when plugged into a PC. If more current
is required, the user must power the board from an external supply or a
USB charger with more current capabilities, up to 1A.
Figure 13: Prototype Board Bottom Side
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