AS3460
Evaluation Board
Demo Kit Manual
• PUBLIC
UG000480
• v3-00 • 2021-Nov-08
126
│ 27
ANC microphones. In order to minimize external PCB routing effort when both stereo outputs are in
use it is possible via internal switch SW1 to route SCLK0 and LRCK0 signal to I2S#1. If this
connection is enabled, there is just a single additional signal line necessary to transfer the four audio
channels back to the host.
The digital audio interface is compliant to the following audio standards:
●
Left Justified
●
I
2
S
The I
2
S
connection (highlighted “I
2
S Selec
tion”) gives the option to connect the I
2
S pins of the AS3460
to the ADC (for music playback) or to the Raspberry Pi Board.
Figure 41:
I
2
S Selection Pins
Figure 42:
Table - I
2
S Selection Pins
ADC
AS3460
Raspi
-
SDO0
SDO0_Raspi
SDIO_ADC
SDIO
SDIO_Raspi
SCLK_ADC
SCLK
SCLK_Raspi
LRCLK_ADC
LRCLK
LRCLK_Raspi
3.10
GPIO Buttons
AS3460 supports a general-purpose I/O interface, which allows to be configured as button interface
for standalone mode operation to switch between ANC and augmented operation modes or mute
audio outputs. When configured as inputs each pin can have internal pull-up/down resistor enabled to
avoid floating inputs.
