Name
Pin #
Type
Part Type
Pin Description
Terminal Order
ANT_PCB
1
Passive
Terminal
Antenna pattern on the carrier board for corner mounting of the module.
ANT_GND1
2
Ground
Terminal
Antenna ground pattern used when the module is mounted in the middle of a board side.
ANT_GND2
3
Ground
Terminal
Antenna grounding used when the module is mounted in the middle of a board side.
GND
4
Ground
Terminal
Ground.
ANT_INT
5
Passive
Terminal
Feed to the internal antenna. Connect to ANT when the internal antenna is used.
ANT
6
Passive
Terminal
2.4 GHz Tx/Rx antenna interface, nominally 50 ohm. Connect to ANT_INT when the internal antenna is used.
GND
7
Ground
Terminal
Ground.
GND
8
Ground
Terminal
Ground.
VCC
9
Power In
Terminal
Module supply voltage input, 1.7-3.6 V.
GND
10
Ground
Terminal
Ground.
GND
11
Ground
Terminal
Ground.
RESET_N
12
Input
Terminal
System reset input, active low.
GPIO_13
13
Bi-Directional
Terminal
GPIO 13 general-purpose I/O.
GPIO_14
14
Bi-Directional
Terminal
GPIO 14 general-purpose I/O.
GPIO_15
15
Bi-Directional
Terminal
GPIO 15 general-purpose I/O.
SWO/GPIO_16
16
Bi-Directional
Terminal
GPIO 16 / SWO trace output.
XL1/GPIO_17
17
Passive
Terminal
32.768 kHz crystal input XL1, alternatively GPIO 17. Ground if the internal RC oscillator is used.
XL2/GPIO_18
18
Passive
Terminal
32.768 kHz crystal output XL2, alternatively GPIO 18. Ground if the internal RC oscillator is used.
UART_TXD/GPIO_19
19
Bi-Directional
Terminal
GPIO 19, used as UART_TXD in u-connectXpress mode.
UART_RXD/GPIO_20
20
Bi-Directional
Terminal
GPIO 20, used as UART_RXD in u-connectXpress mode.
NFC1/GPIO_21
21
Bi-Directional
Terminal
GPIO 21 / NFC1.
NFC2/GPIO_22
22
Bi-Directional
Terminal
GPIO 22 / NFC2.
GPIO_23
23
Bi-Directional
Terminal
GPIO 23 general-purpose I/O.
GPIO_24
24
Bi-Directional
Terminal
GPIO 24 general-purpose I/O.
UART_DTR/GPIO_25
25
Bi-Directional
Terminal
GPIO 25, used as UART_DTR in u-connectXpress mode.
UART_DSR/GPIO_26
26
Bi-Directional
Terminal
GPIO 26, used as UART_DSR in u-connectXpress mode.