ADAU1442 Datasheet, PDF (28/92 Pages) Analog Devices – SigmaDSP Digital Audio Processor

ADAU1442/ADAU1445/ADAU1446
SCL
SDA
START BY
MASTER
0
1
1
1
0
0
ADR
SEL
R/W
ACK BY
ADAU1442/ADAU1445/ADAU1446
FRAME 1
CHIP ADDRESS BYTE
ACK BY
ADAU1442/ADAU1445/ADAU1446
FRAME 2
SUBADDRESS BYTE 1
SCL
(CONTINUED)
SDA
(CONTINUED)
0
ACK BY _REPEATED
ADAU1442/ADAU1445/ADAU1446 START BY
FRAME 3
MASTER
SUBADDRESS BYTE 2
1
1
1
0
0
ADR
SEL
R/W
ACK BY
ADAU1442/ADAU1445/ADAU1446
FRAME 4
CHIP ADDRESS BYTE
SCL
(CONTINUED)
SDA
(CONTINUED)
FRAME 5
READ DATA BYTE 1
ACK BY
MASTER
Figure 14. I²C Read Clocking
FRAME 6
READ DATA BYTE 2
ACK BY STOP BY
MASTER MASTER
S
CHIP ADDRESS,
R/W = 0
AS
SUBADDRESS,
HIGH
AS
SUBADDRESS, _AS
LOW
DATA
AS
BYTE 1
DATA
BYTE 2
S = START BIT, P = STOP BIT, AM = ACKNOWLEDGE BY MASTER, AS = ACKNOWLEDGE BY SLAVE.
SHOWS A ONE-WORD WRITE, WHERE EACH WORD HAS N BYTES.
Figure 15. Single-Word I²C Write Sequence
AS ...
DATA
BYTE N
AS P
S
CHIP
ADDRESS,
AS
SUBADDRESS,
HIGH
AS
SUBADDRESS,
LOW
AS
AS
AS
AS
AS ^...
R/W = 0
AS
AS ^P
DATA-WORD 1, DATA-WORD 1, DATA-WORD 2, DATA-WORD 2,
BYTE 1
BYTE 2
BYTE 1
BYTE 2
DATA-WORD N, DATA-WORD N,
BYTE 1
BYTE 2
S = START BIT, P = STOP BIT, AM = ACKNOWLEDGE BY MASTER, AS = ACKNOWLEDGE BY SLAVE.
SHOWS AN N-WORD WRITE, WHERE EACH WORD HAS TWO BYTES. (OTHER WORD LENGTHS ARE POSSIBLE, RANGING FROM ONE TO FIVE BYTES.)
Figure 16. Burst Mode I²C Write Sequence
S
CHIP ADDRESS,
R/W = 0
AS ^SUBADDRESS,
HIGH
AS ^SUBADDRESS, AS S ^{CHIP ADDRESS,} AS
LOW
R/W = 1
DATA
BYTE 1
AM
DATA
BYTE 2
AM
...
DATA
BYTE N
AM
P
S = START BIT, P = STOP BIT, AM = ACKNOWLEDGE BY MASTER, AS = ACKNOWLEDGE BY SLAVE.
SHOWS A ONE-WORD WRITE, WHERE EACH WORD HAS N BYTES.
Figure 17. Single-Word I²C Read Sequence
S
CHIP
ADDRESS,
AS
SUBADDRESS,
HIGH
AS
SUBADDRESS,
LOW
AS
S
CHIP
ADDRESS,
AS
R/W = 0
R/W = 1
AM
AM ^...
AM
AM ^P
DATA-WORD 1,
BYTE 1
DATA-WORD 1,
BYTE 2
DATA-WORD N, DATA-WORD N,
BYTE 1
BYTE 2
S = START BIT, P = STOP BIT, AM = ACKNOWLEDGE BY MASTER, AS = ACKNOWLEDGE BY SLAVE.
SHOWS AN N-WORD WRITE, WHERE EACH WORD HAS TWO BYTES. (OTHER WORD LENGTHS ARE POSSIBLE, RANGING FROM ONE TO FIVE BYTES.)
Figure 18. Burst Mode I²C Read Sequence
Rev. C | Page 28 of 92