MDBT50Q-1MV2
Implementation Details on Page 35-36
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Needs deciphering
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ext crystal is allowing LDO or DC-DC converter onboard module to work, this reduces power consumption slightly, needs evaluation if it’s worth… fairly small component count but idk what the impact is.
NFC?
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Research on antenna requirements needed
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Research on capabilities needed
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Use for anything other than pairing?
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Digital wallet (in the far future)?
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Cloning hotel keys?
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For Our specific implementation
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Ensure pins used for all buttons are interrupt capable (not all NRF52840 pins are)
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Breakout SWDIO and SWDCLCK
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Check if module has USB isolator/protection, if not add TVS(?) diode
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Try to only use outside pins, which would allow us to delete inner pads except GND pads from footprint → better soldering experience + easier routing