Analog Devices ADAU1977, User Manual

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Evaluation Board User Guide UG-600
either using the microphone itself or by using the dummy
300 Ω or 500 Ω resistor connected across the positive and
negative input terminals of the evaluation board.
16. The faults are reported in the channel status indicators for
each channel for which
Diag Control is Enabled (see
Figure 5).
17. The GUI shown in Figure 5 provides access to all the
diagnostics registers.
18. The DIAG TRIP POINT ADJUST1 section provides
control for adjusting the trip thresholds (see Figure 5).
19. The DIAG_ADJUST2 section provides the fault timeout
adjustment controls (see Figure 5).
20. The DIAG IRQ1 section is used to generate the IRQ using
the FAULT pin. The Fault Pin Drive section is used to
report the fault in the system (see Figure 5).
21. Use the previous controls, as well as the ADAU1977
diagnostics registers in this data sheet, to suit the needs of
the system using the intended microphone.
STANDALONE GUI SPI CONTROL
The EVAL-ADAU1977Z can also be configured for SPI control
instead of for I 2 C control. To use in SPI control mode, take the
following steps:
1. Change Slide Switches S3, S4, and S5 to SPI mode.
2. Ensure JP6 is not installed.
3. In the GUI, go to Options/Comm Protocol and select SPI
mode. (The default is I 2 C mode).
4. The evaluation board is now configured for the SPI
protocol, and the GUI functions similarly to the GUI
functions in I
2 C mode.
STANDALONE MODE
The evaluation board ( EVAL-ADAU1977Z ) also has a
standalone mode that does not require any I 2 C or SPI control.
In standalone mode, the ADAU1977 / ADAU1978 / ADAU1979
are set internally for a specific operation; no register access is
provided because the I
2 C and SPI ports are disabled. To invoke
the standalone mode (SA mode), insert Jumper JP6 and set
Slide Switches S3, S4, and S5 to the standalone position. In SA
mode, limited options are available that can be set using the
dual inline package (DIP) Switch S8. See Table 2 for the S8
switch settings.
Table 2. Settings in SA Mode
ADAU1977 Pin No.,
Mnemonic Switch S8 Function OFF ON
Pin 17, SDA/COUT S8-6 MCLK 256 fs to 384 fs select IOVDD 384 fs GND 256 fs
Pin 18, SCL/CCLK S8-5 Full-scale (FS) 48 k/96 k select IOVDD 96 k GND 48 k
Pin 19, ADDR0/CLATCH S8-4 I 2 S/TDM select IOVDD TDM GND I 2 S
Pin 20, ADDR1/CIN S8-3 Master/slave select IOVDD Slave GND Master
Pin 14, SDATAOUT2 S8-2 TDM 4 to TDM 8 select IOVDD TDM 8 GND TDM 4
Pin 8, FAULT S8-1 TDM 8 slot assignments, Slot 1 to Slot 4 or
Slot 5 to Slot 8 IOVDD Slot 5 to Slot 8 GND Slot 1 to Slot 4
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