Data Sheet

4D SYSTEMS SOMO-II
© 2014 4D SYSTEMS Page 4 of 17 www.4dsystems.com.au
SOMO
-II Embedded Audio
-Sound Module
3. Pin Configuration and Summary
SOMO-14D Pin Outs
Pin
Symbol
I/O
Description
1
USB+
I/O
USB+ Signal, designed to be connected directly to the USB+ pin of an external
USB socket, to then connect to a USB Flash drive
2
USB-
I/O
USB- Signal, to be used in conjunction with USB+
3
NEXT/VOL+
I
Next Song (Song will start playing if currently stopped) when pressed. When
held, the volume of the SOMO-II will ramp up.
4
PREV/VOL-
I
Previous Song (Song will start playing if currently stopped) when pressed. When
held, the volume of the SOMO-II will ramp down.
5
ADKEY1
I
Push button array input 1. Please refer to the ADKEY section for more
information.
6
ADKEY2
I
Push button array input 2. Please refer to the ADKEY section for more
information.
7
GND
P
Power Ground. Connect to GND
8
BUSY
O
Playing indicator, can be used to trigger an external amplifier. Low indicates
Audio output is occurring. High indicates no Audio output.
9
VCC
P
Power Input, 3.3V to 5.0V.
10
GND
P
Power Ground. Connect to GND
11
RX
I
3.3V TTL UART Serial Data Input. Used for SERIAL-MODE
12
TX
O
3.3V TTL UART Serial Data Output. Used for SERIAL-MODE
13
DAC_R
O
Right Channel Audio Output, capable of driving headphones directly, or
connecting to an external amplifier
14
DAC_L
O
Left Channel Audio Output, capable of driving headphones directly, or
connecting to an external amplifier
15
SPK+
O
Speaker +ve output from on board Mono Amplifier, capable of driving a 4ohm
3W Speaker if VCC is 5V.
16
SPK-
O
Speaker -ve output from on board Mono Amplifier.
I = Input, O = Output, P = Power
USB+
USB-
NEXT/VOL+
PREV/VOL-
ADKEY1
ADKEY2
GND
BUSY
SPK-
SPK+
DAC_L
DAC_R
TX
RX
GND
VCC