UM2179 datasheet(27/48 Pages) STMICROELECTRONICS

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UM2179 Rev 9

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UM2179

Hardware layout and configuration

5.12

USB FS OTG

The STM32 Nucleo-144 board supports the USB OTG as host or as device-full-speed

communication through a USB Micro-AB connector (CN14) and USB power switch (U12)

connected to VBUS.

Warning:

The USB Micro-AB connector (CN14) cannot power a Nucleo-

144 board. To avoid damaging the STM32, it is mandatory to

power the board before connecting a USB cable on CN14.

Otherwise there is a risk of current injection on STM32 I/Os.

A green LED LD8 lits up in one of these cases:

•

Power switch (U12) is ON and STM32 Nucleo-144 board works as a USB host

•

VBUS is powered by another USB host when the STM32 Nucleo-144 board works as a

USB device.

The red LED LD7 lits up if overcurrent occurs when +5 V is enabled on VBUS in USB host

mode.

Note:1

It is recommended to power the Nucleo-144 board with an external power supply when

using the USB OTG or the host function.

Note:2

JP4 must be closed when using the USB OTG FS.

Note:3

Limitation: when the cable is not connected, PA9 (VBUS) is not floating, because internal pull

up of PA12 (D+) impacts PA9 through ESD protection part USBLC6-2SC6 (U13).

For pin configuration refer to Table 9.

Table 9. USB pin configuration

name

Function

Configuration

when using USB

connector

Configuration

when using ST

morpho connector

Remark

PA8

USB SOF

Test point TP1

PA9

USB VBUS

SB135 ON

SB135 OFF

PA10

USB ID

SB134 ON

SB134 OFF

PA11

USB DM

SB142 ON

SB142 OFF

PA12

USB DP

SB143 ON

SB143 OFF

PG6

USB GPIO OUT

OTG:SB201 OFF,

SB200 ON

OTG:SB200 OFF

OTG:USB power switch

control

PG5

USB GPIO IN

JP4 ON, SB199

OFF SB198 ON

JP4 OFF

USB overcurrent alarm

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