ak4145 AKM Semiconductor, Inc., ak4145 Datasheet - Page 17

• Manufacturer Part Number: ak4145
• Description: Digital Stereo Btsc Encoder
• Manufacturer: AKM Semiconductor, Inc.

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 the 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 AK4145 will
generates an acknowledge after each byte is received.
In the read mode, the slave, the AK4145 will transmit the eight bits of data, release the SDA line and monitor the line for
an acknowledge. If an acknowledge is detected, 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.
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 which is 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 the master requested a write or read condition. A “1” indicates that the read operation is to be executed.
A “0” indicates that the write operation is to be executed.
Rev. 0.3
SCL FROM
MASTER
DATA
OUTPUT BY
TRANSMITTER
DATA
OUTPUT BY
RECEIVER
CONDITION
START
0
0
1
Figure 9. Acknowledge on the I C-bus
1
Figure 10. The First Byte
0
- 17 -
0
(CAD1/0 are fixed to “00”.)
2
CAD1
CAD0
8
R/W
not acknowledge
acknowledge
Clock pulse
for acknowledge
9
[AK4145]
2007/11