UM1871 datasheet(17/64 Pages) STMICROELECTRONICS

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UM1871

Hardware layout and configuration

Note:

I2C address of WM8994ECS/R is 0b0011010.

2.7

USB OTG FS

STM32446E-EVAL evaluation board supports USB OTG full speed communication via a

USB Micro-AB connector (CN9) and USB power switch (U6) connected to VBUS. The

evaluation board can be powered by this USB connector (JP21 in position FS) at 5 V DC

with 500 mA current limitation. A green LED LD5 will be lit in two conditions:

•

STM32446E-EVAL works as an USB host and power switch (U6) is ON

•

STM32446E-EVAL works as a USB device if VBUS is powered by another USB host

A red LED LD5 will be lit when over-current is detected by the power switch U6.

JP13

Digital microphone power source is connected to +3.3V power when JP13 is set as

shown to the right (default setting):

Digital microphone power source is connected to MICBIAS1 from WM8994ECS/R

when JP13 is set as shown to the right:

Table 6. Audio related jumpers (continued)

Jumper

Description

Table 7. USB_OTG_FS related jumpers

Jumper

Description

JP7

STM32F446 port PA9 is used as USART1_TX (in conjunction with JP6) when JP7 is

set as shown below (see Warning):

STM32F446 port PA9 is connected to USB_FS_VBUS when JP7 is set as shown

below (see Warning):

UM1871 데이터시트(PDF) 17 Page - STMicroelectronics