Hardware configuration

UM1075

12/19

UM1075 Rev 8

4.2

Connection with STM32

For development of applications based on STM32 microcontrollers the ST-LINK/V2 needs

to be connected to the application using the standard 20-pin JTAG flat ribbon provided.

Table 4 summarizes the signals names, functions, and target connection signals of the

standard 20-pin JTAG flat ribbon.

Table 4. JTAG/SWD cable connections

Pin

no.

ST-LINK/V2

connector (CN3)

ST-LINK/V2

function

Target connection

(JTAG)

Target connection

(SWD)

1

VAPP

Target VCC

1. The power supply from the application board is connected to the ST-LINK/V2 debugging and programming

board to ensure signal compatibility between the boards.

MCU VDD(1)

2

3

TRST

JTAG TRST

JNTRST

2. Connect to GND for noise reduction on the ribbon.

3. Available on ST-LINK/V2 only, not connected on ST-LINK/V2-ISOL.

GND(3)

GND(3)(4)

4. At least one of this pin must be connected to the ground for correct behavior (connecting all of them is

recommended).

GND(3)(4)

5

TDI

JTAG TDO

JTDI

GND(2)

6GND(3)

GND(3)

GND(3)(4)

GND(3)(4)

7

TMS_SWDIO

JTAG TMS, SW IO

JTMS

SWDIO

8GND(3)

GND(3)

GND(3)(4)

GND(3)(4)

9

TCK_SWCLK

JTAG TCK, SW CLK JTCK

SWCLK

10

5. GND on ST-LINK/V2, used by SWIM on ST-LINK/V2-ISOL (see Table 3).

GND(5)

GND(4)(5)

GND(4)(5)

11

Not connected

Not connected

Not connected

Not connected

12

GND

GND

GND(4)

GND(4)

13

TDO_SWO

JTAG TDI, SWO

JTDO

6. Optional: for Serial Wire Viewer (SWV) trace.

14

GND(5)

GND(5)

GND(4)(5)

GND(4)(5)

15

NRST

NRST

NRST

NRST

16

GND(3)

GND(3)

GND(3)(4)

GND(3)(4)

17

Not connected

Not connected

Not connected

Not connected

18

GND

GND

GND(4)

GND(4)

19

VDD(3)

VDD (3.3 V)(3)

Not connected

Not connected

20

GND

GND

GND(4)

GND(4)