User Manual

18
Pin No.
Name
Pin function
Description
(54)
P0.10
Digital I/O
General-purpose I/O
(standard drive, low frequency I/O only)
NFC2
NFC input
NFC antenna connection
(55)
GND
Power
Ground
(56)
P1.04
Digital I/O
General-purpose I/O
(standard drive, low frequency I/O only)
(57)
P1.06
Digital I/O
General-purpose I/O
(standard drive, low frequency I/O only)
(58)
P1.07
Digital I/O
General-purpose I/O
(standard drive, low frequency I/O only)
(59)
P1.05
Digital I/O
General-purpose I/O
(standard drive, low frequency I/O only)
(60)
P1.03
Digital I/O
General-purpose I/O
(standard drive, low frequency I/O only)
(61)
P1.01
Digital I/O
General-purpose I/O
(standard drive, low frequency I/O only)
2.5. GPIO Located Near the Radio
Please refer to 2.4 Pin Assignment on page 16 to 18 where identifies some GPIO that have
recommended usage. To maximize RF performance, these GPIO are only available to use
under standard drive, low frequency I/O only, wrong usage may lead to undesirable
performance.
3. Main Chip Solution
RF IC
Crystal Frequency
Nordic NRF52840
32MHZ
32MHz crystal and RF (VDD) DC/DC inductor
are already inside the module.