MAX9867 datasheet(47/55 Pages) MAXIM

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Ultra-Low Power Stereo Audio Codec

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Early STOP Conditions

The MAX9867 recognizes a STOP condition at any

point during data transmission except if the STOP con-

dition occurs in the same high pulse as a START condi-

tion. For proper operation, do not send a STOP

condition during the same SCL high pulse as the

START condition.

Slave Address

The slave address is defined as the 7 most significant

bits (MSBs) followed by the read/write bit. For the

MAX9867, the 7 most significant bits are 0011000.

Setting the read/write bit to 1 (slave address = 0x31)

configures the MAX9867 for read mode. Setting the

read/write bit to 0 (slave address = 0x30) configures

the MAX9867 for write mode. The address is the first

byte of information sent to the MAX9867 after the

START condition.

Acknowledge

The acknowledge bit (ACK) is a clocked 9th bit that the

MAX9867 uses to handshake receipt each byte of data

when in write mode (see Figure 11). The MAX9867 pulls

down SDA during the entire master-generated 9th clock

pulse if the previous byte is successfully received.

Monitoring ACK allows for detection of unsuccessful

data transfers. An unsuccessful data transfer occurs if

a receiving device is busy or if a system fault has

occurred. In the event of an unsuccessful data transfer,

the bus master retries communication. The master pulls

down SDA during the 9th clock cycle to acknowledge

receipt of data when the MAX9867 is in read mode. An

acknowledge is sent by the master after each read byte

to allow data transfer to continue. A not acknowledge is

sent when the master reads the final byte of data from

the MAX9867, followed by a STOP condition.

Write Data Format

A write to the MAX9867 includes transmission of a

START condition, the slave address with the R/W bit set

to 0, 1 byte of data to configure the internal register

address pointer, 1 or more bytes of data, and a STOP

condition. Figure 12 illustrates the proper frame format

for writing 1 byte of data to the MAX9867. Figure 13

illustrates the frame format for writing n bytes of data to

the MAX9867.

SLAVE ADDRESS

DATA BYTE

ACKNOWLEDGE FROM MAX9867

R/W

1 BYTE

AUTOINCREMENT INTERNAL

ACKNOWLEDGE FROM MAX9867

Figure 12. Writing 1 Byte of Data to the MAX9867

SCL

START

CONDITION

SDA

CLOCK PULSE FOR

ACKNOWLEDGMENT

ACKNOWLEDGE

NOT ACKNOWLEDGE

Figure 11. Acknowledge

MAX9867 Datasheet(PDF) 47 Page - Maxim Integrated Products

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