Data Sheet
LC840PA
Datasheet
https://www.lairdconnect.com
13
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Pin
#
Pin Name
Default Function
Alternate
Function
In/
Out
Pull
Up/
Down
nRF52840
QFN Pin
nRF52840
QFN Name
Comment
20
SIO_13
SIO_13
-
IN
PULL-
UP
AD8
PO.13
Laird Devkit: LED1
ProFLEX: Undefined
21
SIO_16
SIO_16
-
IN
PULL-
UP
AC11
PO.16
Laird Devkit: LED4
ProFLEX: Tx LED
22
SIO_14
SIO_14
-
IN
PULL-
UP
AC9
PO.14
Laird Devkit: LED2
ProFLEX: Heartbeat LED
23
GND
-
-
-
-
-
-
-
24
VBUS
4.35V – 5.5V
25
VDD_HV
-
-
-
-
-
-
3.0V to 5.5V
26
GND
-
-
-
-
-
-
-
27
SIO_11
SIO_11
-
IN
PULL-
UP
T2
PO.11
Laird Devkit: BUTTON1
28
SIO_12
SIO_12
-
IN
PULL-
UP
U1
PO.12
BUTTON2
29
SIO_08/
UART_RX
HOST_UART_RX
SIO_08
IN
PULL-
UP
N1
PO.08
smartBASIC:UARTCLOSE()
selects DIO functionality.
UARTOPEN() selects
UART COMMS behavior
ProFLEX:HOST_UART_RX
30
SIO_41/
SPI_CLK
SIO_41
SPI_CLK
IN
PULL-
UP
R1
P1.09
Laird Devkit: SPI
EEPROM.
SPI_Eeprom_CLK, Output:
smartBASIC:SPIOPEN()
selects SPI function, MOSI
and CLK are outputs when
in SPI master mode.
31
VDD
-
-
-
-
3.0V to 3.6V
32
SIO_40/
SPI_MOSI
SIO_40
SPI_MOSI
IN
PULL-
UP
P2
P1.08
Laird Devkit: SPI
EEPROM.
SPI_Eeprom_MOSI, Output
smartBASIC:SPIOPEN()
selects SPI function, MOSI
and CLK are outputs in SPI
master.
33
GND
-
-
-
-
-
-
-
34
SIO_04/
AIN2/
SPI_MISO
SIO_04
AIN2/
SPI_MISO
IN
PULL-
UP
J1
PO.04/AIN2
Laird Devkit: SPI
EEPROM.
SPI_Eeprom_MISO, Input.
smartBASIC:SPIOPEN()
selects SPI function; MOSI
and CLK are outputs when
in SPI master mode