pHAT Module Series
pHAT-HIFI Technical Description
pHAT-HIFI Technical Description
Page 12 of 20
3.6
I
2
S Interface
3.6.1
I
2
S Interface Pins
The pHAT-HIFI provides I
2
S data (DIN), bit clock (BCK) and left/right data word clock (LRCK)
connections on the 20+20 header that connect to the PCM_DOUT, PCM_CLK and PCM_FS on
the Raspberry-Pi board. The table below describes the module I
2
S pins.
Table 5: I
2
S Interface Pins
Pin Name
Pin No
I/O
Description
Comment
PCM_DOUT
40
DIO
I2S Data
3.3V level
PCM_CLK
12
CO
I2S Bit clock
3.3V level
PCM_FS
35
CO
I2S Left/Right data clock
3.3V level
The pHAT-HIFI requires the exclusive use of these GPIO pins to work correctly.
3.6.2
I
2
S Communication
The pHAT-HIFI uses I
2
S communication to transfer digital audio data to the on-board DAC. This
digital audio data is converted into analogue signals. See I
2
S protocol in References for more
information.
