Audio; Rs232, Rs485 And Irda; Table 7. Boot0 Related Jumpers; Table 8. Audio Related Jumpers - ST STM32091C-EVAL User Manual

UM1817
Jumper
JP4
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 STM32F091VCT6, through an audio amplifier and microphone on headset is
connected to ADC input of STM32F091VCT6 through a microphone amplifier. Audio
amplifier can be enabled or disabled by setting of JP17 and mono/stereo playback can be
chosen by setting of JP14, refer to
Jumper
JP17
JP14
Audio amplifier operates correctly when VDDA>2.2V and microphone amplifier operates
correctly when VDDA>2.7V.
2.8

RS232, RS485 and IrDA

The RS232 (with Hardware flow control CTS and RTS ), RS485 and IrDA communication is
supported by D-type 9-pins RS232/RS485 connectors CN9, and IrDA transceiver U14
which is connected to USART1 of STM32F091VCT6 on STM32091C-EVAL evaluation
board. The signal Bootloader_RESET (shared with CTS signal) and Bootloader_BOOT0
(shared with DSR signal) are added on RS232 connector CN9 for ISP support.
USART1_Rx is chosen by setting of JP13, refer

Table 7. Boot0 Related Jumpers

The Bootloader_BOOT0 is managed by pin 6 of connector CN9 (RS232 DSR signal)
when JP4 is closed. This configuration is used for boot loader application only.
Default Setting: Not fitted
Table 8

Table 8. Audio Related Jumpers

Speaker amplifier U18 is enabled when JP17 is closed (Default setting)
Speaker amplifier U18 is disabled when JP17 is open
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:
DocID026902 Rev 2
Hardware Layout and configuration
Description
for details.
Description
toTable 9 for details.
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