Audio I/O - Mikroe EasyMx PRO v7a Manual

C1
1uF
VCC-3.3V VCC-1.8V
R4
10K
U1
36 1
GPIO4 MCP/LN1 MCP/LN
35 2
GND MICN MIC
34 3
GPIO1 XRESET XRESE
33 4
DGND0 DGND
5
XTEST CVDD0 CVDD
31 6
R9 27 VS1053 IOVDD0 IOVDD
PH_MISO 30 7
SO CVDD1 CVDD
PH_MOSI 29 8
SI DREQ DRE
PH_SCK 28 9
SCLK GPIO2 GPIO
27 10
R12 27
TX GPIO3 GPIO
26 11
RX GPIO6 GPIO
25 12
GPIO5 GPIO7 GPIO7
VCC-3.3V
R16
10K
C12 22pF
MCU_SCK
MCU_MISO
MCU_MOSI
R22
12.288MHz X1 PC6
1M
PC7
PC8
PC9
C13 22pF
DATA BUS
VCC-3.3V
R1 10
L
R3 10
R
GBUF
PHONEJACK
R5 R6 R7
MICP
10 20 20
MICN
VCC-3.3V
MP3-RST#
C3 C4 C2
47nF 10nF 10nF
R11
R8 1K
100k
MP3-DREQ
R13
C8
1K
100pF
MICP
C9 E2 E3
100pF 10uF 10uF
MICN
MICROPHONE
C10
R17
100pF
1K
R19
1K
R20
100K
VCC-3.3V
PH_SCK
PH_MISO
PH_MOSI
MP3-DREQ
E4 C14 C18 C19 C15
MP3-RST#
10uF 100nF 100nF 100nF 100nF
MP3-CS#
MP3-DCS
SW13

Audio I/O

It's hard to imagine modern multimedia devices without high quality audio reproduction
modules. Sounds and music are almost as important as graphical user interfaces. Along
with other multimedia modules, EasyMx PRO v7a contains high end stereo VS1053
audio codec. It features Ogg Vorbis/MP3/AAC/WMA/FLAC/WAVMIDI audio decoder, as
well as an PCM/IMA ADPCM/Ogg Vorbis encoder on a single chip. Board also contains
two stereo audio connectors for interfacing with standard 3.5mm stereo audio jacks.
VS1053 receives the input bit stream through a serial input bus, which it listens to as a
system slave. The input stream is decoded and passed through a digital volume control
to an 18-bit oversampling, multi-bit, sigma-delta Digital to Analog Converter (DAC).
The decoding is controlled via a serial control bus. In addition to the basic decoding, it is
possible to add application specific features like DSP effects to the user RAM memory.
You can build music players, audio recording devices, internet radio player applications,
and much more.
CN19
CN21
Audio IN/OUT
connection schematics
U3
1 5
IN OUT
2
GND
R23
3 4
C20 C16 EN ADJ E5 C21 C17
100nF 2.2uF 120K 10uF 100nF 100nF
AP7331-ADJ
R24 R25
22K 12K1
Enabling Audio I/O
In order to use Audio I/O module,
you must connect data and Audio
control lines of the microcontroller
with the VS1053 audio codec. To
do this, push SW13.1–SW13.7
switches to ON position. This
will connect SPI data lines with
MCU_SCK, MCU_MISO and MCU_
VCC-1.8V
MOSI microcontroller pins, and
audio control and chip select lines
C22 C23
100nF 100nF
with PC6, PC7, PC8 and PC9 pins.
E a s y M x P R O v 7 a U s e r M a n u a l