User Manual

Hexiwear Workstation
Page 23
OTHER MODULES
Audio
module
The Hexiwear Workstation comes equipped with two audio
amplifi ers, capable of delivering up to 675mW of continuous
RMS power into two built-in 8-ohm speakers. These amplifi ers
are used to amplify the line level sound from the VS1053, a
stereo MP3 audio CODEC IC. Left and right audio signals from
the CODEC IC are routed to the ON/OFF DIP switch, labeled as
SW4. By setting SW4.6 and SW4.7 switches ON, the line level
audio signal is routed to the amplifi ers and thus, speakers. To
provide the digital input for the VS1053 IC, another OFF/ON DIP
switch (labeled as SW5) has to be used, in order to route all the
necessary digital lines that carry the audio information from
the docked Hexiwear. By setting switches from SW5.1 (G2.6) to
SW5.7 (G2.1) to ON position, the respective pins become routed
to VS1053 IC, allowing the sound data to reach the VS1053 IC
(Figure 23 and 24).
V02
8
GND
7
VDD
6
V01
5
IN-
4
IN+
3
BYPASS
2
SHUT
1
U6
LM4864
1
2
SP1
C46
100n
C45
100µF
VCC-3V3
R122
22k
R123
75k
C44
10µF
C42
100n
C43
100n
V02
8
GND
7
VDD
6
V01
5
IN-
4
IN+
3
BYPASS
2
SHUT
1
U7
LM4864
1
2
SP2
C51
100n
C50
100µF
VCC-3V3
R124
22k
R125
75k
C49
10µF
C47
100n
C48
100n
L_SPK
R_SPK
12345678
O
N
SW4
DIP SWITCH 8 pin
G0_LED
G1_LED
G2_LED
G3_LED
G4_LED
BUZZERG2.5
L
R
L_SPK
R_SPK
MP3-RST#
MP3-DREQ
MP3-DCS
MP3-CS#
MP3-SCK
MP3-MISO
MP3-MOSI
12345678
O
N
SW5
DIP SWITCH 8 pin
G2.6
G2.7
G3.0
BUZZER
G2.0
G2.1
G2.2
G1.7
G4.0
DATA BUS
Figure 23: Audio module with the schematic
Figure 24:
MP3 CODEC and
routing to amplifi ers