Communications Header (J1); Self-Boot; Power-Down - Analog Devices EVAL-ADUSB2EBZ User Manual

UG-477
Use the Signal Routing tab to route the core outputs, ADCs, or
serial inputs to the either of the two available serial output lines.
Ensure that Output ASRC is switched to Enabled (see Figure 45).
Figure 45. Signal Routing

COMMUNICATIONS HEADER (J1)

J1 connects to the EVAL-ADUSB2EBZ
about the USBi can be found in
The IC defaults to I C mode; however, it can be put into SPI control
2
mode by pulling the CLATCH pin low three times.

SELF-BOOT

To use 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 46).
Figure 46. E2Prom
Before writing to the E2PROM, ensure that it has been erased by
clearing it from SigmaStudio. To do this, right-click on E2Prom,
select the Read/Write window, and click Clear E2Pro to clear
the memory (see Figure 47).
Figure 47. Clear E2pro
USBi. More information
Application Note AN-1006.
To Link-Compile-Download the project (see Figure 28), right-
click on ADAU1772
E2PROM (see Figure 48).
Once the project has been written to the E2PROM, move the
self-boot switch, S2, to the ON position (see Figure 49). This
ensures that the
powers up.

POWER-DOWN

The power-down header, J15 (/PD) on the silkscreen of the board
provides access to the power-down pin on the ADAU1772. Put a
jumper on the header to power down all analog and digital circuits.
Before enabling /PD ensure to mute the outputs to avoid any pops
or clicks when the IC is powered down.
Rev. A | Page 14 of 28
Evaluation Board User Guide
and select Write Latest Compilation to
Figure 48. Write to E2Prom
ADAU1772 boots from the E2PROM when it
Figure 49. Self-Boot Switch On