Analog Devices ADAU1772, Руководство пользователя

Страница: 11 / 27

Evaluation Board User Guide UG-177
Rev. 0 | Page 11 of 27
Figure 36. Unpopulated Headers J13 and J16
MP PINS
The MP PIN JUMPERS header J9 provides access to MP pins
MP0, MP1, MP2, MP3, and MP6 of the ADAU1772, as well as
facilitates the use of the push buttons on the EVAL-
ADAU1772Z board. See Figure 46 for the pin-out of the header.
These jumpers are used to enable the use of the volume control,
mute, and other capabilities of the ADAU1772.
To utilize the full functionality of the MP pins on the
ADAU1772 you can change the selections in the drop-down
menus under the
Pin/Pad Control tab in the Hardware
Configuration
/
ADAU1772 Register Control
section of
SigmaStudio (See Figure 37).
Figure 37. MP PINS Drop Down Menus
MP pins MP4 and MP5 are connected to the Digital
Microphone headers J6 and J7.
SERIAL AUDIO INTERFACE
Serial audio signals in I
2
S, Left Justified, Right Justified, or TDM
format can be connected to the Serial Audio Interface Header
J4. This header also includes master clock input and output
connection pins. In order to use MCLK on the Header J4, you
must first install a resistor across the R2 pads. The R2 resistor is
not populated from the factory. To use an external MCLK, you
will also need to remove resistor R3 from the board to eliminate
contention from the XTAL oscillator on the MCLK line. (See
Figure 38).
Figure 38.R2 and R3
COMMUNICATIONS HEADER
The Communications Header J1 connects to the EVAL-
ADUSB2EBZ. More information about the USBi can be found
in the
AN-1006 application note.
The IC defaults to I
2
C mode but can be put into SPI control
mode by pulling the CLATCH pin low three times.
SELF-BOOT
To utilize the ADAU1772 self-boot function, go to the hardware
configuration tab and add an E2PROM IC to the USBi interface
from the Tree Toolbox (see Figure 39).
Figure 39. E2PROM