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Layout for jumper from board VDD to MCU VDD pins, with layout for
an optional zero ohm resistor to permanently connect these signals.
Layout for jumper from MCU VDD to MCU VDDA and from MCU VSS
to MCU VSSA pins, with populated zero ohm resistor shorting jumper
pins.
Layout for jumper from MCU VDDA to MCU VREFH and from MCU
VSSA to MCU VREFL pins, with populated zero ohm resistor shorting
jumper pins
All power traces are minimum double width
Four test points for GND
Four test point for VDD
Voltage input jumpers
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powered DEMO via on-board voltage regulator (3.3V)
powered DEMO via on-board USB BDM (3.3V)
powered DEMO via on-board battery (3.0V)
supply 3.3V power to the MCU_PORT header if the board is
powered though the on-board regulator or USB
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Noise filter in the VDD to VDDA, VSS and VSSA connection in order
to improve ADC accuracy
MCU :
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Reset switch with optional LED indicator.
IRQ Button
Crystal circuit for 32kHz to 16MHz crystal for XOSC2 input (not
populated)
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Use circuit components recommended by crystal manufacturer
and MCU data sheet.
Footprint for jumpers to disable XTAL from MCU
0 ohm resistors in parallel with jumper footprints to connect XTAL
circuit
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Jumpers to disable all the user I/O functions from additional circuitry
DEMOEM User Manual
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