CD00237391 Datasheet, PDF (158/177 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM

Application block diagrams
A.3
USB OTG full speed (FS) interface solutions
Figure 86. USB OTG FS (full speed) device-only connection
V_DD
5V to V_DD
Volatge regulator ⁽¹⁾
STM32F20xxx
STM32F20xxx
OSC_IN
OSC_OUT
PA9
PA11
PA12
VBUS
DM
DP
V_SS
ai17295
1. The same application can be developed using the OTG HS in FS mode to achieve enhanced performance
thanks to the large Rx/Tx FIFO and to a dedicated DMA controller.
Figure 87. USB OTG FS (full speed) host-only connection
GPIO
GPIO+IRQ
STM32F20xx
OSC_IN
OSC_OUT
PA9
PA11
PA12
V_DD
EN
Overcurrent
Current limiter
power switch⁽¹⁾
5 V Pwr
VBUS
DM
DP
V_SS
ai17296c
1. The current limiter is required only if the application has to support a V_BUS powered device. A basic power
switch can be used if 5 V are available on the application board.
2. The same application can be developed using the OTG HS in FS mode to achieve enhanced performance
thanks to the large Rx/Tx FIFO and to a dedicated DMA controller.
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Doc ID 15818 Rev 9