ADAU1977WBCPZ-R7 datasheet(25/68 Pages) AD

25 / 68 page

Data Sheet

ADAU1977

Rev. C | Page 25 of 68

In the event of a fault on an input pin, the FAULT pin goes low or

high depending on the setting of the IRQ_POL bit in Register 0x15

to send an interrupt request to the system microcontroller. The

system microcontroller responds to the interrupt request by

communicating with the ADAU1977 via the I2C.

The following is the typical interrupt service routine:

1. An interrupt request is generated from the ADAU1977 to

the system microcontroller.

2. Read Register 0x11 through Register 0x14. (It is recom-

mended to read all four diagnostics status registers—

Reading the registers as a single read may not report the

status accurately.)

3. Write Register 0x15, Bit 6 (the IRQ_RESET bit).

4. Wait for the fault timeout period to expire.

5. If the fault was temporary and did not persist, the interrupt

service ends and the intermittent fault is ignored. If the

fault persists, another interrupt request is generated from

the ADAU1977, and the user should continue on to Step 6.

6. Repeat Step 2 through Step 4 four times.

7. If after the fifth reading, the diagnostics still report the

presence of a fault, the fault exists on the respective input

and must be attended to.

SERIAL AUDIO DATA OUTPUT PORTS—DATA

FORMAT

The serial audio port comprises four pins: BCLK, LRCLK,

SDATAOUT1, and SDATAOUT2. The ADAU1977 ADC outputs

are available on the SDATAOUT1 and SDATAOUT2 pins in

serial format. The BCLK and LRCLK pins serve as the bit clock

and frame clock, respectively. The port can be operated as master

or slave and can be set either in stereo mode (2-channel mode)

or in TDM multichannel mode. The supported popular audio

formats are I2S, left justified (LJ), right justified (RJ).

Stereo Mode

In 2-channel or stereo mode, the SDATAOUT1 outputs ADC

data for Channel 1 and Channel 2, and the SDATOUT2 outputs

ADC data for Channel 3 and Channel 4. Figure 24 through

Figure 28 show the supported audio formats.

Figure 24. I2S Audio Format

Figure 25. LJ Audio Format

Figure 26. RJ Audio Format

BCLK

LRCLK

SDATAOUT1

(I2S MODE)

SDATAOUT2

(I2S MODE)

NOTES

1. SAI = 0.

2. SDATA_FMT = 0 (I2S).

CHANNEL 1

CHANNEL 2

8 TO 32 BCLKs

CHANNEL 3

CHANNEL 4

BCLK

LRCLK

SDATAOUT1

(LJ MODE)

SDATAOUT2

(LJ MODE)

CHANNEL 1

CHANNEL 2

CHANNEL 3

CHANNEL 4

NOTES

1. SDATA_FMT = 1 (LJ).

BCLK

LRCLK

SDATAOUT1

(RJ MODE)

SDATAOUT2

(RJ MODE)

CHANNEL 1

CHANNEL 2

CHANNEL 3

CHANNEL 4

NOTES

1. SDATA_FMT = 2 (RJ, 24-BIT).

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