32 MHz STM32L073RZ Cortex-M0+ with 192 KB flash and 20 KB RAM.

PC10 USART4_TX
PC11 USART4_RX

CN3 STLINK RX
CN3 STLINK TX

Default for standalone NUCLEO-L073RZ

SB13 and SB14 ON, SB62 and SB63 OFF

PA2 USART2_TX ST-LINK RX
PA3 USART2_RX ST-LINK TX

Default for NUCLEO-L073RZ with I-NUCLEO-LRWAN1

SB13 and SB14 OFF, SB62 and SB63 ON

PA2 USART2_TX ARD D1 TX
PA3 USART2_RX ARD D0 RX

By removing the two jumpers at CN2, the ST-LINK interface can be used to program another board such as the I-NUCLEO-LRWAN1 daughterboard.

1 VDD TARGET
2 SWCLK
3 GND
4 SWDIO
5 NRST
6 SWO (RESERVED)

Product page

User manual

Schematic

MCU data-sheet

MCU reference manual

P-NUCLEO-LRWAN1

P-NUCLEO-LRWAN2