AN2606 datasheet(30/155 Pages) STMICROELECTRONICS

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STM32F105xx/107xx devices bootloader

AN2606

30/155

DocID13801 Rev 21

5.3.3

USART bootloader Get-Version command returns 0x20

instead of 0x22

Description

In USART mode, the Get-Version command (defined in AN3155) returns 0x20 instead of

0x20.

This limitation is present on bootloader versions V1.0 and V2.0, while it is fixed in bootloader

version 2.1.

Workaround

None.

5.3.4

PA9 excessive power consumption when USB cable is plugged

in bootloader V2.0

Description

When connecting a USB cable after booting from System-Memory mode, PA9 pin

(connected to VBUS=5 V) is also shared with USART TX pin which is configured as alternate

push-pull and forced to 0 since the USART peripheral is not yet clocked. As a consequence,

a current higher than 25 mA is drained by PA9 I/O and may affect the I/O pad reliability.

This limitation is fixed in bootloader version 2.1 by configuring PA9 as alternate function

push-pull when a correct 0x7F is received on RX pin and the USART is clocked. Otherwise,

PA9 is configured as alternate input floating.

Workaround

None.

AN2606 bảng dữ liệu(PDF) 30 Page - STMicroelectronics