Data Sheet

LC840PA
Datasheet
https://www.lairdconnect.com
12
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3.2 Pin Definitions
Table 1: Pin definitions
Pin
#
Pin Name
Default Function
Alternate
Function
In/
Out
Pull
Up/
Down
nRF52840
QFN Pin
nRF52840
QFN Name
Comment
0
GND
-
-
-
-
-
-
-
1
SWDIO
SWDIO
-
IN
PULL-
UP
AC24
SWDIO
-
2
DO NOT
CONNECT/NC
No Connect
IN
PULL-
UP
U24
P1.04
Do Not Connect.
3
SWDCLK
SWDCLK
-
IN
PULL-
DOWN
AA24
SWDCLK
4
DO NOT
CONNECT/NC
No Connect
-
-
PULL-
UP
W24
P1.02
Do Not Connect.
5
SIO_35/
nAutoRUN
nAutoRUN
(smartBASIC
only)
SIO_35
IN
PULL-
DOWN
V23
P1.03
Laird Devkit: FTDI
USB_DTR via jumper on
J12 pin1-2.
6
SIO_33
SIO_33
IN
PULL-
UP
Y23
P1.01
-
7
SIO_32
SIO_32
-
IN
PULL-
UP
AD22
P1.00
-
8
SIO_25
SIO_25
-
IN
PULL-
UP
AC21
PO.25
Laird Devkit: BUTTON4
9
SIO_23
SIO_23
QSPI_DIO3
IN
PULL-
UP
AC19
PO.23
-
10
SIO_24
SIO_24
IN
PULL-
UP
AD20
PO.24
Laird Devkit: BUTTON3
11
SIO_22
SIO_22
QSPI_DIO2
IN
PULL-
UP
AD18
PO.22
-
12
SIO_21/
DEBUG_RX
DEBUG_RX
SIO_21/
QSPI_DIO1
IN
PULL-
UP
AC17
PO.21
ProFLEX: Debug UART Rx
(Fixed 115.2kBaud, 8N1)
13
SIO_20/
DEBUG_TX
DEBUG_TX
SIO_20/
QSPI_DIO0
IN
PULL-
UP
AD16
PO.20
ProFLEX: Debug UART Tx
(Fixed 115.2kBaud, 8N1)
14
SIO_19
SIO_19
QSPI_CLK
IN
PULL-
UP
AC15
PO.19
-
15
D+
D+
-
IN
AD6
D+
-
16
SIO_17/WAKE
WAKE
SIO_17/
QSPI_CS
IN
PULL-
UP
AD12
PO.17
ProFLEX: wake (Active
Low)
17
D-
D-
-
IN
AD4
D-
-
18
SIO_15
SIO_15
-
IN
PULL-
UP
AD10
PO.15
Laird Devkit: LED3
ProFLEX: Rx LED
19
nRESET
nRESET
SIO_18
IN
PULL-
UP
AC13
PO.18
System Reset (Active Low)