The connector is a standard USB Micro-B connector.
Table 5.
USB Micro-B connector CN23 (front view)
Pin
number
Pin name
Signal name
Functions
1
VBUS
5V_USB_ST_LINK
VBUS Power
2
DM
USB_STLK_N
DM
3
DP
USB_STLK_P
DP
4
ID
-
-
5
GND
GND
GND
7.4.4
Virtual COM port: USART1
ST-LINK/V2-1 offers a USB Virtual COM port bridge. This feature gives access to the USART1 of the
STM32WB15CC by the CN15 USB ST-LINK connector.
By default, this USART1 interface of STM32WB15CC is connected to the UART2 port of the ST-LINK/V2-1 MCU
(STM32F103).
This VCP can be used differently with an intermediate connection. On the CN14 connector both TX and RX
signals are available and two solder bridges can disconnect the UART coming from SoC.
Table 6.
UART interface pinout description
Name
I/O
Wake-up available
USART1 RX (PA10/pin 36)
Pin 1
STLINK_TX: UART2 TX (PA2/pin 12)
USART1 TX (PA9/pin 18)
Pin 2
STLINK_RX: UART2 RX (PA3/pin 13)
7.4.5
Level shifter
NUCLEO-WB15CC has a system to supply STM32WB15CC with a different voltage than ST-LINK. The ST-LINK
is always supplied by 3.3 V sources. By default, STM32WB15CC is supplied by the same voltage value as
ST-LINK, but it is possible to supply the SoC with another value. It accepts a voltage between 1.8 and 3.3 V trust
to a level shifter. This specific component assures the voltage conversion between the ST-LINK and the SoC. It
drives SWD and UART signals connected to VCP on ST-LINK.
7.4.6
JP5 multi
‑
function jumper
The JP5 multi
‑
function jumper can connect ST-LINK/V2-1 to STM32WB15CC. It is located between the level
shifter and the SoC. It is referenced to the VDD domain (STM32WB15CC supply voltage domain).
Figure 11.
Interconnection bloc diagram between STM32WB15CC and ST-LINK/V2-1
UM2823
Embedded ST-LINK/V2-1
UM2823
-
Rev 1
page 17/37
