Data Sheet

LC840PA
Datasheet
https://www.lairdconnect.com
14
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Pin
#
Pin Name
Default Function
Alternate
Function
In/
Out
Pull
Up/
Down
nRF52840
QFN Pin
nRF52840
QFN Name
Comment
35
SIO_06/
UART_TX
SIO_06
UART_TX
OUT
Set
High in
FW
L1
PO.06
smartBASIC:UARTCLOSE()
selects DIO functionality.
UARTOPEN() selects
UART COMMS behavior
ProFLEX: HOST_UART_TX
36
SIO_26/
I2C_SDA
SIO_26
I2C_SDA
IN
PULL-
UP
G1
PO.26
Laird Devkit: I2C RTC
chip. I2C data line.
37
SIO_07/
UART_CTS
SIO_07
UART_RTS
IN
PULL-
DOWN
M2
PO.07
smartBASIC:UARTCLOSE()
selects DIO functionality.
UARTOPEN() selects
UART COMMS behavior
38
SIO_27/
I2C_SCL
SIO_27
I2C_SCL
IN
PULL-
UP
H2
PO.27
Laird Devkit: I2C RTC
chip. I2C clock line.
39
SIO_05/
UART_RTS/
AIN3
SIO_05/
UART_RTS
AIN3
OUT
Set
Low in
FW
K2
PO.05/AIN3
smartBASIC:UARTCLOSE()
selects DIO functionality.
UARTOPEN() selects
UART COMMS behavior
ProFLEX: UART_CTS
40
GND
-
-
-
-
-
-
-
41
SIO_01/
XL2
XL2
SIO_01
IN
PULL-
UP
F2
PO.01/XL2
Laird Devkit: Optional
32.768kHz crystal pad XL2
and associated load
capacitor.
42
SIO_00/
XL1
XL1
SIO_00
IN
PULL-
UP
D2
PO.00/XL1
Laird Devkit: Optional
32.768kHz crystal pad XL1
and associated load
capacitor.
43
GND
-
-
-
-
-
-
-
44
SIO_31/
AIN7
SIO_31
AIN7
IN
PULL-
UP
A8
PO.31/AIN7
-
45
SIO_30/
AIN6
SIO_30
AIN6
IN
PULL-
UP
B9
PO.30/AIN6
-
46
SIO_28/
AIN4
SIO_28
AIN4
IN
PULL-
UP
B11
PO.28/AIN4
-
47
GND
-
-
-
-
-
-
-
48
SIO_29/
AIN5
SIO_29
AIN5
IN
PULL-
UP
A10
PO.29/AIN5
-
49
SIO_03/
AIN1
SIO_03
AIN1
IN
PULL-
UP
B13
PO.03/AIN1
Laird Devkit: Temp Sens
Analog
50
SIO_02/
AIN0
SIO_02
AIN0
IN
PULL-
DOWN
A12
PO.02/AIN0
smartBASIC: Internal pull-
down. Pull High externally
to enter VSP (Virtual Serial
Port) Service.