ST B-L4S5I-IOT01A - PC Connectivity Ports

7.3 ST-LINK/V2-1 USB Micro-B
The USB connector is used to connect the embedded ST-LINK/V2-1 to the PC to program and debug the
STM32L4S5VIT6U microcontroller.
Table 8. USB Micro-B connector pinout
Connector
Pin
number
Pin name Signal name
STM32L
4+ pin
Function
CN7
1
V
BUS
5V_USB_ST_LINK -
5V power and
detection
2 DM USB_STLK_N PA11
USB differential pair
M
3 DP USB_STLK_P PA12
USB differential pair
P
4 ID USB_STLK_ID - USB identification
5 GND - - Ground
7.4 ST-LINK debug connector CN8
The ST-LINK debug connector is a 1x4-pin, 2.54 mm pitch male connector. It provides access to the embedded
SWJ-DP interface of the STM32F103CBT6 MCU. This SWJ-DP interface is a combined JTAG and serial wire
debug port that enables either a serial wire debug or a JTAG probe, to be connected to the target.
Table 9. ST-LINK debug connector pinout
Connector Pin number Pin name STM32F103CBT6 Function
CN7
1 3V3_ST_LINK
V
BAT
, V
DDA
, V
DD_1
, V
DD_2
, V
DD_3
3.3 V voltage supply
2 STM_JTCK TCK / SWCLK
3 GND GND
4 STM_JTMS JTMS / SWDIO
7.5 USB OTG FS Micro-AB
Table 10. USB OTG FS Micro-AB connector pinout
Connector
Pin
number
Pin name Signal name
STM32L
4+ pin
Function
CN9
1
V
BUS
USB_OTG_5V_VBUS PA9
5V power and
detection
2 DM USB_OTG_FS_DM PA11
USB differential pair
M
3 DP USB_OTG_FS_DP PA12
USB differential pair
P
4 ID USB_OTG_FS_ID PA10 USB identification
5 GND - - Ground
UM2708
ST-LINK/V2-1 USB Micro-B
UM2708 - Rev 1
page 29/43