UM1075

User manual
ST-LINK/V2 in-circuit debugger/programmer
for STM8 and STM32

Introduction
The ST-LINK/V2 is an in-circuit debugger/programmer for the STM8 and STM32
microcontroller families. The single wire interface module (SWIM) and JTAG/serial wire
debugging (SWD) interfaces, facilitate communication with any STM8 or STM32
microcontroller located on an application board.
In addition to providing the same functionalities as the ST-LINK/V2, the ST-LINK/V2-ISOL
features digital isolation between the PC and the target application board. It also withstands
voltages of up to 2500 VRMS.
The USB full-speed interface allows communication with a PC and:
● STM8 devices via ST Visual Develop (STVD) or ST Visual Program (STVP) software
(which are available from STMicroelectronics)
● STM32 devices via Atollic, IAR, Keil, and TASKING integrated development
environments.

Table 1. Applicable tools

Type Part number Order Code Description

ST-LINK/V2 In-circuit debugger/programmer

Development
ST-LINK/V2 In-circuit debugger/programmer
tools ST-LINK/V2-ISOL
with digital isolation

Figure 1. ST-LINK/V2 and ST-LINK/V2-ISOL

ST-LINK/V2 ST-LINK/V2-ISOL

October 2012 Doc ID 018748 Rev 6 1/19

www.st.com
Contents UM1075

Contents

1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Product contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Hardware configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Connection with STM8 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.1 Standard ERNI connection with SWIM flat ribbon . . . . . . . . . . . . . . . . . . 9
3.1.2 Low-cost SWIM connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.3 SWIM signals and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Connection with STM32 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 ST-LINK/V2 status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Software configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 ST-Link/V2 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 STM8 application development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 STM32 application development and Flash programming . . . . . . . . . . . . 15

5 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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UM1075 List of tables

List of tables

Table 1. Applicable tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. SWIM flat ribbon connections for ST-LINK/V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 3. SWIM low-cost cable connections for ST-LINK/V2-ISOL . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4. JTAG/SWD cable connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 5. How third party toolchains support ST-LINK/V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 6. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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List of figures UM1075

List of figures

Figure 1. ST-LINK/V2 and ST-LINK/V2-ISOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. ST-LINK/V2 product contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. ST-LINK/V2-ISOL product contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4. Connectors of the ST-LINK/V2 and ST-LINK/V2-ISOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. ERNI connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6. Key detail on connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 7. Low-cost connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Target SWIM connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9. JTAG and SWD connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 10. JTAG debugging flat ribbon layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 11. SWIM ST-LINK/V2 standard ERNI cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 12. SWIM ST-LINK/V2 low-cost cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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UM1075 Features

1 Features

● 5 V power supplied by a USB connector

● USB 2.0 full speed compatible interface
● USB standard A to mini B cable
● SWIM specific features
– 1.65 V to 5.5 V application voltage supported on SWIM interface
– SWIM low-speed and high-speed modes supported
– SWIM programming speed rate: 9.7 Kbytes/s in low speed and 12.8 Kbytes/s in
high speed
– SWIM cable for connection to the application via an ERNI standard vertical (ref:
284697 or 214017) or horizontal (ref: 214012) connector
– SWIM cable for connection to the application via a pin header or a 2.54 mm pitch
connector
● JTAG/serial wire debugging (SWD) specific features
– 1.65 V to 3.6 V application voltage supported on the JTAG/SWD interface and 5 V
tolerant inputs
– JTAG cable for connection to a standard JTAG 20-pin pitch 2.54 mm connector
– Supports JTAG communication
– Supports serial wire debug (SWD) and serial wire viewer (SWV) communication
● Direct firmware update feature supported (DFU)
● Status LED which blinks during communication with the PC
● 2500 VRMS high isolation voltage (ST-LINK/V2-ISOL only)
● Operating temperature 0 to 50 °C

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Product contents UM1075

2 Product contents

Figures ST-LINK/V2 product contents show the various cables delivered within the product.
They include (from left to right in Figure 2 and Figure 3):
● USB standard A to mini B cable (A)
● ST-LINK/V2 debugging and programming (B)
● SWIM low-cost connector (C)
● SWIM flat ribbon with a standard ERNI connector at one end (D)
● JTAG or SWD and SWV flat ribbon with a 20-pin connector (E)

Figure 2. ST-LINK/V2 product contents

D E
C

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UM1075 Product contents

Figure 3. ST-LINK/V2-ISOL product contents

C E
D
A
B

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Hardware configuration UM1075

3 Hardware configuration

The ST-LINK/V2 is designed around the STM32F103C8 device which incorporates the high-
performance ARM®, Cortex™-M3 core. It is available in a TQFP48 package.
As shown in Figure 4, the ST-LINK/V2 provides two connectors:
● an STM32 connector for the JTAG/SWD and SWV interface
● an STM8 connector for the SWIM interface
The ST-LINK/V2-ISOL provides one connector for the STM8 SWIM, STM32 JTAG/SWD and
SWV interfaces.

Figure 4. Connectors of the ST-LINK/V2 and ST-LINK/V2-ISOL

A C

1. A = STM32 JTAG and SWD target connector

2. B = STM8 SWIM target connector
3. C = STM8 SWIM, STM32 JTAG and SWD target connector
4. D = Communication activity LED

3.1 Connection with STM8 applications

For STM8 developments, the ST-LINK/V2 can be connected to the target board by two
different cables, depending on the connector available on the application board.
These cables are:
● SWIM flat ribbon with a standard ERNI connector at one end
● SWIM cable with two 4-pin, 2.54 mm connector or SWIM separate-wires cable

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UM1075 Hardware configuration

3.1.1 Standard ERNI connection with SWIM flat ribbon

Figure 5 shows how to connect the ST-LINK/V2 if a standard ERNI 4-pin SWIM connector is
present on the application board.

Figure 5. ERNI connection

A A

B B

1. A = Target application board with ERNI connector

2. B = Wire cable with ERNI connector at one end
3. C = STM8 SWIM target connector
4. See Figure 11: SWIM ST-LINK/V2 standard ERNI cable.

Figure 6 shows that pin 16 is missing on the ST-LINK/V2-ISOL target connector. This
missing pin is used as a safety key on the cable connector to guarantee connection of the
SWIM cable in the correct position on the target connector even pins, used for both SWIM
and JTAG cables.

Figure 6. Key detail on connectors

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Hardware configuration UM1075

3.1.2 Low-cost SWIM connection

Figure 7 shows how to connect the ST-LINK/V2 if a 4-pin, 2.54 mm, low-cost SWIM
connector is present on the application board.

Figure 7. Low-cost connection

A A

B B

1. A = Target application board with 4-pin, 2.54 mm, low-cost connector

2. B = Wire cable with a 4-pin connector or separate-wires cable
3. C = STM8 SWIM target connector
4. See Figure 12: SWIM ST-LINK/V2 low-cost cable

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UM1075 Hardware configuration

3.1.3 SWIM signals and connections

Table 2 summarizes the signal names, functions, and target connection signals using the
wire cable with a 4-pin connector.

Table 2. SWIM flat ribbon connections for ST-LINK/V2

Pin no. Name Function Target connection

1 VDD Target VCC(1) MCU VCC

2 DATA SWIM MCU SWIM pin
3 GND GROUND GND
4 RESET RESET MCU RESET pin
1. The power supply from the application board is connected to the ST-LINK/V2 debugging and programming
board to ensure signal compatibility between both boards.

Figure 8. Target SWIM connector

Table 3 summarizes the signal names, functions, and target connection signals using the
separate-wires cable.
As the SWIM separate-wires cable has independent connectors for all pins on one side, it is
possible to connect the ST-LINK/V2-ISOL to an application board without a standard SWIM
connector. On this flat ribbon, all signals are referenced by a specific color and a label to
ease the connection on target.

Table 3. SWIM low-cost cable connections for ST-LINK/V2-ISOL

Color Cable pin name Function Target connection

Red TVCC Target VCC(1) MCU VCC

Green UART-RX
Reserved (2)
Blue UART-TX Unused
(not connected on the target board)
Yellow BOOT0
Orange SWIM SWIM MCU SWIM pin
Black GND GROUND GND
White SWIM-RST RESET MCU RESET pin
1. The power supply from the application board is connected to the ST-LINK/V2 debugging and programming
board to ensure signal compatibility between both boards.
2. BOOT0, UART-TX and UART-RX are reserved for future developments.

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Hardware configuration UM1075

TVCC, SWIM, GND and SWIM-RST can be connected to a low-cost 2.54 mm pitch
connector or to pin headers available on the target board.

3.2 Connection with STM32 applications

For STM32 developments, 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

ST-LINK/V2 connector ST-LINK/V2 function Target connection Target connection
Pin no.
(CN3) (JTAG) (SWD)

1
VAPP Target VCC MCU VDD(1) MCU VDD(1)
2
3 TRST JTAG TRST JNTRST GND(2)
4 GND GND GND(3) GND(3)
5 TDI JTAG TDO JTDI GND(2)
6 GND GND GND(3) GND(3)
7 TMS_SWDIO JTAG TMS, SW IO JTMS SWDIO
8 GND GND GND(3) GND(3)
9 TCK_SWCLK JTAG TCK, SW CLK JTCK SWCLK
(3)
10 GND GND GND GND(3)
11 NC Not connected Not connected Not connected
(3)
12 GND GND GND GND(3)
13 TDO_SWO JTAG TDI, SWO JTDO TRACESWO(4)
14 GND GND GND(3) GND(3)
15 NRST NRST NRST NRST
(3) GND(3)
16 GND GND GND
17 NC Not connected Not connected Not connected
(3)
18 GND GND GND GND(3)
19 VDD VDD (3.3V)(5) Not connected Not connected
20 GND GND GND(3) GND(3)
1. The power supply from the application board is connected to the ST-LINK/V2 debugging and programming
board to ensure signal compatibility between both boards.
2. Connect to GND for noise reduction on the ribbon.
3. At least one of this pin must be connected to the ground for correct behavior (connecting all of them is
recommended).
4. Optional: for Serial Wire Viewer (SWV) trace.
5. Available on ST-LINK/V2 only and not connected on ST-LINK/V2/OPTO.

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UM1075 Hardware configuration

Figure 9 shows how to connect the ST-LINK/V2 to a target using the JTAG cable.

Figure 9. JTAG and SWD connection

B A

B
C
C

1. A = Target application board with JTAG connector

2. B = JTAG/SWD 20-wire flat cable
3. C= STM32 JTAG and SWD target connector
The reference of the connector needed on the target application board is:
2x10C header wrapping 2x40C H3/9.5 (pitch 2.54) - HED20 SCOTT PHSD80.

Figure 10. JTAG debugging flat ribbon layout

19 17 15 13 11 9 7 5 3 1

20 18 16 14 12 10 8 6 4 2

Viewed from above PCB

ai18744

Note: For low cost applications or when the standard 20 pins pitch 2.54mm connector footprint is
too big, it is possible to implement the Tag-Connect solution to save cost and space on the
application board. The Tag-Connect adapter and cable provide a simple reliable means of
connecting ST-LINK/V2 or ST-LINK/V2-ISOL to your PCB without requiring a mating

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Hardware configuration UM1075

component on application PCB. For more details on this solution and application PCB
footprint information, please visit www.Tag-Connect.com.
The references of components compatible with JTAG and SWD interfaces are:
a) TC2050-ARM2010 adapter (20pins to 10pins interface board)
b) TC2050-IDC or TC2050-IDC-NL (No Legs) (10pins cable)
c) TC2050-CLIP retaining clip for use with TC2050-IDC-NL (optional)

3.3 ST-LINK/V2 status LEDs

The LED labeled ‘COM’ on top of the ST-LINK/V2 shows the ST-LINK/V2 status (whatever
the connection type).
When the:
● LED is blinking RED: the first USB enumeration with the PC is taking place.
● LED is RED: communication between the PC and ST-LINK/V2 is established (end of
enumeration).
● LED is blinking GREEN/RED: data are being exchanged between the target and the
PC.
● LED is GREEN: the last communication has been successful.
● LED is ORANGE: ST-LINK/V2 communication with the target has failed.

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UM1075 Software configuration

4 Software configuration

4.1 ST-Link/V2 firmware upgrade

The ST-Link/V2 embeds a firmware upgrade mechanism for in-situ upgrade through the
USB port. As the firmware might evolve during the whole life of the ST-Link/V2 product (new
functionality, bug fixes, support for new microcontroller families …), it is recommended to
visit www.st.com/stlinkv2 periodically in order to stay up-to-date with the latest firmware
version.

4.2 STM8 application development

Please refer to ST toolset Pack24 with Patch 1 or more recent, which includes ST Visual
Develop (STVD) and ST Visual Programmer (STVP).

4.3 STM32 application development and Flash programming

Third party toolchains, Atollic TrueSTUDIO, IAR EWARM, Keil MDK-ARM, and TASKING
VX-toolset support ST-LINK/V2 according to the versions given inTable 5 or the most recent
version available.

Table 5. How third party toolchains support ST-LINK/V2

Third party Toolchain Version

Atollic TrueSTUDIO 2.1

IAR EWARM 6.20
Keil MDK-ARM 4.20
TASKING VX-toolset for ARM Cortex-M 4.0.1

The ST-LINK/V2 requires a dedicated USB driver. If the toolset installed it automatically, file
stlink_winusb.inf is installed in <WINDIR>/inf (where <WINDIR> is typically C:/Windows).
If the toolset setup did not install it automatically, the driver can be found on www.st.com:
1. Connect to www.st.com.
2. In the search tab, part number field, look for ST-Link/V2.
3. Click on the Generic Part Number column’s hyperlink to ST-Link/V2.
4. In the Design support tab, SW drivers section, click on the icon to download st-
link_v2_usbdriver.zip.
5. Unzip and run ST-Link_V2_USBdriver.exe.
For more information on third party tools, please visit:
● www.atollic.com
● www.iar.com
● www.keil.com
● www.tasking.com

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Schematics UM1075

5 Schematics

Figure 11. SWIM ST-LINK/V2 standard ERNI cable

Target board
(horizontal mount)

ST-LINK/V2 board

Note: connector located on the

edge of the board

Cable lenght 100mm

Low cost
1 femal
2 connector
ERNI

3 02 201 3047 ST-LINK/V2

4 male
connector 02
20 227 2041
224394
PCB Footprint 214012 Note: Black wire location

PIN 1 - VDD

PIN 2 - DATA
USB
Target board

CN3
(vertical mount) PIN 3 - GND

1
PIN 4 - RESET

1
CN4

USB

1
2 PCB
3
4

PCB Footprint 214017

ai18745V2

1. Legend for pin descriptions:

VDD = Target voltage sense
DATA = SWIM DATA line between target and debug tool
GND = Ground voltage
RESET = Target system reset

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UM1075 Schematics

Figure 12. SWIM ST-LINK/V2 low-cost cable

Target board ST-LINK/V2 board

Application male
connector Low cost Low cost
02 20 227 2041 femal Cable lenght 100 mm femal
connector connector
02 201 3047 02 201 3047 ST-LINK/V2
PCB male
connector 02
20 227 2041

1
1

PIn 1 - VDD PIn 1 - VDD

PIn 2 - DATA PIn 2 - DATA
PIn 3 - GND PIn 3 - GND
USB
PIn 4 - RESET

1
PIn 4 - RESET

1
CN4
CN3

USB
PCB
PCB

ai18746V2

1. Legend for pin descriptions:

VDD = Target voltage sense
DATA = SWIM DATA line between target and debug tool
GND = Ground voltage
RESET = Target system reset

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Revision history UM1075

6 Revision history

Table 6. Document revision history

Date Revision Changes

22-Apr-2011 1 Initial release.

Table 2: SWIM flat ribbon connections for ST-LINK/V2: added
footnote 1 to the function “Target VCC”.
Table 4: JTAG/SWD cable connections: added footnote to the
03-Jun-2011 2
function “Target VCC”.
Table 5: How third party toolchains support ST-LINK/V2: updated the
“Versions” of IAR and Keil.
19-Aug-2011 3 Added USB driver details to Section 4.3.
Added SWD and SWV to JTAG connection features. Modified
11-May-2012 4
Table 4: JTAG/SWD cable connections.
Added ST-LINK/V2-ISOL order code.
Updated Section 4.1: STM8 application development on page 15
13-Sep-2012 5 Added Note 5. in Table 4.
Added Note “For low cost applications...” before Section 3.3: ST-
LINK/V2 status LEDs on page 14
18-Oct-2012 6 Added Section 4.1: ST-Link/V2 firmware upgrade on page 15.

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UM1075

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