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Hardware layout and configuration

UM1817

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DocID026902 Rev 3

2.7

Audio

STM32091C-EVAL evaluation board supports stereo audio playback and microphone

recording by an external headset connected on audio jack CN13. Audio play is connected to

DAC output of the STM32F091VCT6 through an audio amplifier and microphone on

headset is connected to ADC input of the STM32F091VCT6 through a microphone

amplifier. Audio amplifier is enabled or disabled by setting JP17 and mono/stereo playback

is selected by setting JP14, refer to Table 9 for details.

Audio amplifier operates correctly when VDDA > 2.2V and microphone amplifier operates

correctly when VDDA > 2.7V.

2.8

RS-232, RS-485 and IrDA

The RS-232 (with hardware flow control CTS and RTS), the RS-485 and the IrDA

communication are supported by the D-type 9-pins RS-232/RS-485 connectors CN9, and

by the IrDA transceiver U14 which is connected to the USART1 of the STM32F091VCT6 on

the STM32091C-EVAL evaluation board. The signal Bootloader_RESET (shared with CTS

signal) and the Bootloader_BOOT0 (shared with DSR signal) are added on the RS-232

connector CN9 for ISP support.

USART1_Rx is chosen by setting of JP13, refer to Table 10 for details.

Table 8. Boot0 related jumpers

Jumper

Description

JP4

The Bootloader_BOOT0 is managed by pin 6 of the connector CN9 (RS-232 DSR

signal) when JP4 is closed. This configuration is used for the bootloader application

only.

Default Setting: Not fitted

Table 9. Audio related jumpers

Jumper

Description

JP17

Speaker amplifier U18 is enabled when JP17 is closed (Default setting)

Speaker amplifier U18 is disabled when JP17 is open

JP14

Mono playback is enabled when JP14 is set as shown to the right (Default setting):

Stereo playback is enabled when JP14 is set as shown to the right:

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