ak4140 AKM Semiconductor, Inc., ak4140 Datasheet - Page 31

• Manufacturer Part Number: ak4140
• Description: Digital Btsc Decoder
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
AK4140 supports a fast-mode I
1. Data transfer
All commands are preceded by a START condition. After the START condition, a slave address is sent. After the
AK4140 recognizes the 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 a STOP condition generated
by the master device.
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.
A HIGH to LOW transition on the SDA line while SCL is HIGH indicates a START condition. All sequences start from
the START condition.
A LOW to HIGH transition on the SDA line while SCL is HIGH defines a STOP condition. All sequences end by the
STOP condition.
MS0547-E-01
1-1. Data validity
1-2. START and STOP condition
Control Interface (I
SCL
SDA
SCL
SDA
2
C-bus)
START CONDITION
2
C-bus system (max : 400kHz).
Figure 17. START and STOP conditions
DATA VALID
DATA LINE
STABLE :
Figure 16. Data transfer
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CHANGE
OF DATA
ALLOWED
STOP CONDITION
[AK4140]
2007/03