AK4685 AKM [Asahi Kasei Microsystems], AK4685 Datasheet - Page 38

• Manufacturer Part Number: AK4685
• Description: Multi-channel CODEC with Differential Analog I/O
• Manufacturer: AKM [Asahi Kasei Microsystems]

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The AK4685 supports fast-mode I
1. Data transfer
All commands are preceded by START condition. After the START condition, a slave address is sent. After the AK4685
recognizes START condition, the device interfaced to the bus waits for the slave address to be transmitted over the SDA
line. If the transmitted slave address matches an address for one of the devices, the designated slave device pulls the SDA
line to LOW (ACKNOWLEDGE). The data transfer is always terminated by STOP condition generated by the master
device.
1-1. Data validity
The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW state of the data line
can only change when the clock signal on the SCL line is LOW except for the START and the STOP condition.
1-2. START and STOP condition
A HIGH to LOW transition on the SDA line while SCL is HIGH indicates START condition. All sequences start from
START condition. A LOW to HIGH transition on the SDA line while SCL is HIGH defines STOP condition. All
sequences end by STOP condition.
MS1106-E-00
Serial Control Interface
SCL
SDA
SCL
SDA
START CONDITION
2
C-bus system (max: 400kHz).
Figure 20. START and STOP conditions
DATA VALID
DATA LINE
STABLE :
Figure 19. Data Transfer
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CHANGE
OF DATA
ALLOWED
STOP CONDITION
[AK4685]
2009/08