ak4683 AKM Semiconductor, Inc., ak4683 Datasheet - Page 62

• Manufacturer Part Number: ak4683
• Description: Asynchronous Multi-channel Audio Codec With Dir/t
• Manufacturer: AKM Semiconductor, Inc.

(2)-1-3. ACKNOWLEDGE
ACKNOWLEDGE is a software convention used to indicate successful data transfers. The transmitting device will
release the SDA line (HIGH) after transmitting eight bits. The receiver must pull down the SDA line during the
acknowledge clock pulse so that that it remains stable “L” during “H” period of this clock pulse. The AK4683 will
generates an acknowledge after each byte has been received.
In the read mode, the slave, the AK4683 will transmit eight bits of data, release the SDA line and monitor the line for an
acknowledge. If an acknowledge is detected and no STOP condition is generated by the master, the slave will continue
to transmit data. If an acknowledge is not detected, the slave will terminate further data transmissions and await the
STOP condition.
The register of ADC/DAC part can not generate acknowledge for READ operations.
(2)-1-4. FIRST BYTE
The first byte, which includes seven bits of slave address and one bit of R/W bit, is sent after the START condition. If
the transmitted slave address matches an address for one of the device, the receiver who has been addressed pulls down
the SDA line.
The most significant five bits of the slave address are fixed as “00100”. The next two bits are CAD1 and CAD0 (device
address bits). These two bits identify the specific device on the bus. The eighth bit (LSB) of the first byte (R/W bit)
defines whether a write or read condition is requested by the master. A “1” indicates that the read operation is to be
executed. A “0” indicates that the write operation is to be executed.
MS0427-E-02
SCL FROM
MASTER
DATA
OUTPUT BY
TRANSMITTER
DATA
OUTPUT BY
RECEIVER
CONDITION
START
0
0
(CAD1-CAD0 = fixed to “10” for ADC/DAC part, “00” for DIR/DIT part)
Figure 43. Acknowledge on the I
1
1
Figure 44. The First Byte
0
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0
CAD1
2
C-bus
CAD0
8
R/W
not acknowledge
acknowledge
Clock pulse
for acknowledge
9
[AK4683]
2007/04