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UM1461
Hardware layout and configuration
Doc ID 022138 Rev 1
17/65
2.17
USB OTG HS
The STM3240G-EVAL evaluation board enables USB OTG high speed communication via a
USB Micro-AB connector (CN9), USB high speed PHY (U8) and USB power switch (U4)
connected to VBUS. The evaluation board can be powered by this USB connector (CN9) at
5V DC with a 500 mA current limitation.
The LED LD7 indicates that power switch (U4) is ON and STM3240G-EVAL is working as a
USB host or that VBUS is powered by another USB host when STM3240G-EVAL is working
as a USB device. The LD8 indicates an over-current.
The USB ULPI bus is shared with CAN2 bus, the JP10 and JP3 must be kept open for USB
OTG HS.
Note:
On boards MB786 prior to version B03 it is possible that after a board RESET the MCU is no
longer able to control communication with the OTG PHY (U8). When this issue occurs the
only way to recover OTG PHY control is to power the board OFF and ON. This issue is fixed
on MB786 version B03 or newer.
Table 12.
MicroSD card related jumper
Jumper
Description
JP31
To disable USB OTG PHY U8, JP31 is not fitted.
Default setting: Fitted
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