The Function Of Pins; Note - mikroElektronika Audio Codec Proto Manual

Figure 2: AUDIO CODEC PROTO additional board connection schematic

The function of pins:

SCK - Digital Audio Bit Clock, Pull Down
MISO - ADC Digital Audio Data Output
MOSI - DAC Digital Audio Data Input
ADCL - ADC Sample Rate Left/Right Clock, Pull Down
DACL - DAC Sample Rate Left/Right Clock, Pull Down
SDA - 3-Wire MPU Data Input / 2-Wire MPU Data Input
SCL - 3-Wire MPU Clock Input / 2-Wire MPU Clock Input

NOTE:

Pull up/pull down is only present when Control Register Interface is ACTIVE=0 in order to save power.
Figure 3: Dimensions of the additional board
MikroElektronika