UM1817 datasheet(12/58 Pages) STMICROELECTRONICS

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Hardware layout and configuration

UM1817

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DocID026902 Rev 3

2.1.2

ST-LINK/V2-1 firmware upgrade

The ST-LINK/V2-1 embeds a firmware upgrade mechanism for in-situ upgrade through the

USB port. As the firmware may evolve during the life time of the ST-LINK/V2-1 product (for

example new functionalities, bug fixes, support for new microcontroller families), it is

recommended to visit the www.st.com website before starting to use the STM32091C-EVAL

board and periodically, in order to stay up-to-date with the latest firmware version.

2.2

Board power supply

STM32091C-EVAL evaluation board is designed to be powered by 5 V DC power supply

and to be protected by PolyZen from wrong power plug-in event. It is possible to configure

the evaluation board to use any of the following three sources for the power supply:

•

5 V DC power adapter connected to CN16 (the Power jack on the board showed as

PSU on JP15 silkscreen and called E5V). The external power supply is not provided

with the board.

•

5 V DC power from CN12 (the USB Type-B connector of ST-LINK/V2-1, that is showed

as STlk on JP15 silkscreen and called U5V). If the USB enumeration succeeds (as

explained below), the ST-LINK U5V power is enabled, by asserting the PWR_EN pin.

This pin is connected to a power switch (ST890), which powers the board. This power

switch features also a current limitation to protect the PC in case of short-circuit on the

board. If overcurrent (more than 600 mA) happens on board, the LED LD10 is lit.

•

5 V DC power from CN7 (the extension connector for daughterboard, that is showed as

D5V on JP15 silkscreen).

STM32091C-EVAL evaluation board can be powered from ST-LINK USB connector CN12

(U5V), but only the ST-LINK part has the power before USB enumeration, because the host

PC only provides 100 mA to the board at that time. During the USB enumeration, the

STM32091C-EVAL board asks for the 300 mA power to the host PC. If the host is able to

provide the required power, the enumeration finishes by a “SetConfiguration” command and

then, the power transistor U23 (ST890) is switched ON, the red LED LD5 is turned ON, thus

STM32091C-EVAL board can consume maximum 300 mA current, but not more. If the host

is not able to provide the requested current, the enumeration fails. Therefore the ST890

(U23) remains OFF and the STM32 part including the extension board will not be powered.

As a consequence the red LED LD5 remains turned OFF. In this case it is mandatory to use

an external power supply as extra power supply.

E5V (from PSU) or D5V can be used as external power supply in case the current

consumption of the STM32091C-EVAL board exceeds the allowed current on the USB. In

this condition it is still possible to use the USB for communication, for programming or

debugging only, but it is mandatory to power the board first using E5V or D5V, then

connecting the USB cable to the PC. Proceeding this way the enumeration succeeds thanks

to the external power source.

The following power sequence procedure must be respected:

Connect jumper JP15 for PSU or D5V side

Check that JP18 is removed

Connect the external power source to PSU or D5V (daughterboard mounted)

Check red LED LD5 is turned ON

Connect the PC to USB connector CN12

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