
Doc ID TBD Rev 0.8
Rev 0.1
7/19
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2.6
Pin assignment
Table 6. Pin assignment
Pin
Name
Type
Description
STM32L pin
(1)
1
TXRXLED
O
Active low Tx/Rx LED drive
PA2
2
WKUP
I/O
Wake up module from shutdown
PA0
3
GPIO0
I/O
General purpose input/output 0
PB15
4
GPIO1
I/O
General purpose input/output 1
PB14
5
MODE0
I/O
Protocol mode selection 0
(2)
PB13
6
MODE1
I/O
Protocol mode selection 1
(2)
PB12
7
VDD
Power Supply input voltage
-
8
GND
Power Ground
-
9
SWDIO
I/O
Serial wire I/O
PA13
10
SWCLK
I
Serial wire clock
PA14
11
BOOTMODE
I
Boot mode selection
BOOT0
12
RESET
I
Reset input, active low
NRST
13
TXD
O
UART transmit data
PA9
14
RXD
I
UART receive data
PA10
15
RTS
O
UART request to send
PB6
16
CTS
I
UART clear to send
PB7
1. For more details see the STM32L151RB datasheet, Pin descriptions section. Alternate functions of any
given pin are dependent on the user application firmware that is loaded into the module and is beyond the
scope of the document.
2. Refer to Hardware design section for details of protocol mode selection.