ADAU1977WBCPZ-R7 datasheet(30/68 Pages) AD

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ADAU1977

Data Sheet

Rev. C | Page 30 of 68

CONTROL PORTS

The ADAU1977 control port allows two modes of operation—

either 2-wire I2C mode or 4-wire SPI mode—that are used for

setting the internal registers of the part. Both the I2C and SPI

modes allow read and write capability of the registers. All the

registers are eight bits wide. The registers start at Address 0x00

and end at Address 0x1A.

The control port in both I2C and SPI modes is slave only and,

therefore, requires the master in the system to operate. The registers

can be accessed with or without the master clock to the part.

However, to operate the PLL, serial audio ports, and boost

converter, the master clock is necessary.

By default, the ADAU1977 operates in I2C mode, but the part can

be put into SPI mode by pulling the CLATCH pin low three times.

The control port pins are multifunctional, depending on the

mode in which the part is operating. Table 20 describes the

control port pin functions in both modes.

Table 20. Control Port Pin Functions

I2C Mode

SPI Mode

Pin No.

Pin Name

Pin Functions

Pin Type

Pin Functions

Pin Type

SDA/COUT

SDA: data

I/O

COUT: output data

SCL/CCLK

SCL: clock

CCLK: input clock

ADDR0/CLATCH

I2C Device Address Bit 0

CLATCH: input

ADDR1/CIN

I2C Device Address Bit 1

CIN: input data

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