Product Info

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external circuitry. The feature must be configured in the EXTSUPLLY and REGOUT0 UICR
registers. In the reference circuitry, External supply is annotated with the VEXT net name.
 When using the USB peripheral, a 5V USB supply needs to be provided on the VBUS pin.
Recommended RF Layout & Ground Plane:
The module integrated antenna requires a suitable ground plane to radiate effectively. The area
under and extending out from the antenna portion of the module should be kept clear of copper and
other metal. The module should be placed at the edge of the PCB with the antenna edge facing out.
Reducing the ground plane will reduce the effective radiated power. Please add as more as possible
via holes on the mother board near the GND pin of module, this will be good for the RF performance of
system board.
PCB Footprint （Top View）:
Radio
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