MAX9867 datasheet(48/55 Pages) MAXIM

48 / 55 page

Ultra-Low Power Stereo Audio Codec

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The slave address with the R/W bit set to 0 indicates

that the master intends to write data to the MAX9867.

The MAX9867 acknowledges receipt of the address

byte during the master-generated 9th SCL pulse.

The second byte transmitted from the master config-

ures the MAX9867’s internal register address pointer.

The pointer tells the MAX9867 where to write the next

byte of data. An acknowledge pulse is sent by the

MAX9867 upon receipt of the address pointer data.

The third byte sent to the MAX9867 contains the data

that is written to the chosen register. An acknowledge

pulse from the MAX9867 signals receipt of the data byte.

The address pointer autoincrements to the next register

address after each received data byte. This autoincre-

ment feature allows a master to write to sequential regis-

ters within one continuous frame. Figure 13 illustrates

how to write to multiple registers with one frame. The

master signals the end of transmission by issuing a

STOP condition. Register addresses greater than 0x17

are reserved. Do not write to these addresses.

Read Data Format

Send the slave address with the R/W bit set to 1 to initi-

ate a read operation. The MAX9867 acknowledges

receipt of its slave address by pulling SDA low during

the 9th SCL clock pulse. A START command followed

by a read command resets the address pointer to reg-

ister 0x00.

The first byte transmitted from the MAX9867 is the con-

tent of register 0x00. Transmitted data is valid on the

rising edge of SCL. The address pointer autoincre-

ments after each read data byte. This autoincrement

feature allows all registers to be read sequentially within

one continuous frame. A STOP condition can be issued

after any number of read data bytes. If a STOP condi-

tion is issued followed by another read operation, the

first data byte to be read is from register 0x00.

The address pointer can be preset to a specific register

before a read command is issued. The master presets

the address pointer by first sending the MAX9867’s

slave address with the R/W bit set to 0 followed by the

sent followed by the slave address with the R/W bit set

to 1. The MAX9867 then transmits the contents of the

specified register. The address pointer autoincrements

after transmitting the first byte.

The master acknowledges receipt of each read byte

during the acknowledge clock pulse. The master must

acknowledge all correctly received bytes except the

last byte. The final byte must be followed by a not

acknowledge from the master and then a STOP condi-

tion. Figure 14 illustrates the frame format for reading 1

byte from the MAX9867. Figure 15 illustrates the frame

format for reading multiple bytes from the MAX9867.

1 BYTE

AUTOINCREMENT INTERNAL

ACKNOWLEDGE FROM MAX9867

B1 B0

B3 B2

B5 B4

B7 B6

ACKNOWLEDGE FROM MAX9867

R/W

1 BYTE

ACKNOWLEDGE FROM MAX9867

B1 B0

B3 B2

B5 B4

B7 B6

SLAVE ADDRESS

DATA BYTE 1

DATA BYTE n

Figure 13. Writing n Bytes of Data to the MAX9867

ACKNOWLEDGE FROM MAX9867

1 BYTE

AUTOINCREMENT INTERNAL

ACKNOWLEDGE FROM MAX9867

NOT ACKNOWLEDGE FROM MASTER

ACKNOWLEDGE FROM MAX9867

R/W

REPEATED START

SLAVE ADDRESS

DATA BYTE

Figure 14. Reading 1 Byte of Data from the MAX9867

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