ADAU1373BCBZ-R7 datasheet(70/296 Pages) AD

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ADAU1373

Rev. 0 | Page 70 of 296

CONTROL PORTS

The ADAU1373 has a 2-wire I2C bus control port, which can

be used to set the registers. The control port is capable of full

read/write operation for all addressable registers. Operations

such as mute and input/output mode control are programmed

by writing to these registers.

All addresses can be accessed in either single-address mode or

burst mode. The first byte (Byte 1) of a control port write contains

the 7-bit chip address plus the R/W bit. The next byte (Byte 2)

forms the subaddress of the register location within the

ADAU1373. This subaddress must be a single byte long. All

subsequent bytes (starting with Byte 3) contain the data to be

written to the register. The number of bytes per word depends

on the type of data that is being written.

The ADAU1373 provides several mechanisms for updating

signal processing parameters in real time without causing

pops or clicks.

The function of each of the two control port pins (SCL and SDA)

is described in Table 31.

Table 31. Control Port Pin Functions

Pin Name

I2C Mode

SCL

Input clock

SDA

Open-collector input/output

I2C PORT

The ADAU1373 supports a 2-wire serial (I2C-compatible)

microprocessor bus that drives multiple peripherals. Two pins,

serial data (SDA) and serial clock (SCL), carry information

between the ADAU1373 and the system I2C master controller.

In I2C mode, the ADAU1373 is always a slave on the bus,

meaning that it cannot initiate a data transfer. Each slave device

is recognized by a unique address. The address and R/W byte

format is shown in

. The address resides in the first

seven bits of the I2C write. The I2C address for the ADAU1373

is 0x1A. The LSB of the address (the R/

Table 32

W bit) specifies either

a read or write operation. A Logic 1 corresponds to a read

operation, and a Logic 0 corresponds to a write operation.

Burst mode addressing, where the subaddresses are automati-

cally incremented at word boundaries, can be used for writing

large amounts of data to contiguous registers. This increment

happens automatically after a single word write unless a stop

condition is encountered. A data transfer is always terminated

by a stop condition.

The SDA and SCL pins should each have a 2 kΩ pull-up resistor

to IOVDD5 (1.8 V to 3.3 V).

Table 32. I2C Address and Read/Write Byte Format

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

R/W

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