ADAU1781 Analog Devices, ADAU1781 Datasheet - Page 34

• Manufacturer Part Number: ADAU1781
• Description: SigmaDSP Low-noise Stereo Audio Codec for Portable Applications
• Manufacturer: Analog Devices

Specifications of ADAU1781

• Instructions/cycles: 1024
• Digital I/o Channels: 8/8
• Analog I/o Channels: 2/2
• Product Description: SigmaDSP low-noise stereo audio codec for portable applications

ADAU1781
Stop and start conditions can be detected at any stage during
the data transfer. If these conditions are asserted out of sequence
with normal read and write operations, the ADAU1781
immediately jumps to the idle condition. During a given SCL
high period, the user should issue only one start condition, one
stop condition, or a single stop condition followed by a single
start condition. If an invalid subaddress is issued by the user,
the ADAU1781 does not issue an acknowledge and returns to
the idle condition. If the user exceeds the highest subaddress while
(CONTINUED)
(CONTINUED)
(CONTINUED)
(CONTINUED)
(CONTINUED)
(CONTINUED)
START BY
MASTER
SDA
SDA
SCL
SCL
SDA
SDA
SDA
SCL
SCL
SCL
START BY
MASTER
0
0
1
1
1
1
SUBADDRESS BYTE 2
CHIP ADDRESS BYTE
SUBADDRESS BYTE 2
CHIP ADDRESS BYTE
READ DATA BYTE 1
1
1
FRAME 1
FRAME 3
FRAME 1
FRAME 3
FRAME 5
0
0
ADDR1
ADDR1
Figure 38. I
Figure 37. I
ADDR0
ADDR0
ACKNOWLEDGE
ACKNOWLEDGE
ACKNOWLEDGE
BY ADAU1781
BY ADAU1781
ACKNOWLEDGE
ACKNOWLEDGE
BY ADAU1781
R/W
2
R/W
C Read from ADAU1781 Clocking
BY ADAU1781
BY ADAU1781
Rev. B | Page 34 of 92
2
C Write to ADAU1781 Clocking
in auto-increment mode, one of two actions is taken. In read mode,
the ADAU1781 outputs the highest subaddress register contents
until the master device issues a no acknowledge, indicating the
end of a read. A no-acknowledge condition is where the SDA
line is not pulled low on the ninth clock pulse on SCL. If the
highest subaddress location is reached while in write mode, the
data for the invalid byte is not loaded into any subaddress register,
a no acknowledge is issued by the ADAU1781, and the part returns
to the idle condition.
REPEATED
START BY MASTER
0
READ DATA BYTE 2
SUBADDRESS BYTE 1
1
FRAME 6
FRAME 2
SUBADDRESS BYTE 1
CHIP ADDRESS BYTE
1
DATA BYTE 1
FRAME 4
FRAME 2
FRAME 4
1
0
ACKNOWLEDGE
ACKNOWLEDGE
ADDR1
BY ADAU1781
BY MASTER
ACKNOWLEDGE
BY ADAU1781
ADDR0
ACKNOWLEDGE
ACKNOWLEDGE
BY ADAU1781
BY ADAU1781
R/W
STOP BY
MASTER
STOP BY
MASTER