MAX9879 datasheet(26/32 Pages) AD

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MAX9879

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

Maxim Integrated

ACKNOWLEDGE FROM MAX9879

1 BYTE

AUTOINCREMENT INTERNAL

ACKNOWLEDGE FROM MAX9879

NOT ACKNOWLEDGE FROM MASTER

ACKNOWLEDGE FROM MAX9879

R/W

REPEATED START

SLAVE ADDRESS

DATA BYTE

Figure 11. Reading One Indexed Byte of Data from the MAX9879

1 BYTE

AUTOINCREMENT INTERNAL

ACKNOWLEDGE FROM MAX9879

B1 B0

B3 B2

B5 B4

B7 B6

ACKNOWLEDGE FROM MAX9879

R/W

1 BYTE

ACKNOWLEDGE FROM MAX9879

B1 B0

B3 B2

B5 B4

B7 B6

SLAVE ADDRESS

DATA BYTE 1

DATA BYTE n

Figure 10. Writing n Bytes of Data to the MAX9879

MAX9879. Figure 10 illustrates the frame format for writ-

ing n bytes of data to the MAX9879.

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

that the master intends to write data to the MAX9879.

The MAX9879 acknowledges receipt of the address

byte during the master-generated 9th SCL pulse.

The second byte transmitted from the master config-

ures the MAX9879’s internal register address pointer.

The pointer tells the MAX9879 where to write the next

byte of data. An acknowledge pulse is sent by the

MAX9879 upon receipt of the address pointer data.

The third byte sent to the MAX9879 contains the data

that is written to the chosen register. An acknowledge

pulse from the MAX9879 signals receipt of the data

byte. The address pointer autoincrements to the next

autoincrement feature allows a master to write to

sequential registers within one continuous frame. Figure

10 illustrates how to write to multiple registers with one

frame. The master signals the end of transmission by

issuing a STOP (P) condition.

not write to these addresses.

SLAVE ADDRESS

DATA BYTE

ACKNOWLEDGE FROM MAX9877

R/W

1 BYTE

AUTOINCREMENT INTERNAL

ACKNOWLEDGE FROM MAX9877

ACKNOWLEDGE FROM MAX9879

Figure 9. Writing One Byte of Data to the MAX9879

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