CXA2055P 데이터 시트보기 (PDF) - Sony Semiconductor
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CXA2055P Datasheet PDF : 20 Pages
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CXA2055P
1. Application
The CXA2055P is a preamplifier for computer displays, and combines three R, G and B channels into a
single package. All controls such as the contrast and black level for each channel are performed via I2C
bus control.
1) I2C bus
Two wires (SDA, SCL) provide control over start, stop, data transfer, synchronization and collision
avoidance. The IC outputs are either open collector or open drain, forming a bus line in the wired OR
format. The bus signal configuration is as follows.
SDA
D ATA
A
DA TA
MSB
LSB
MSB
SCL
S
123 456 789 123
START
S : Start condition; SDA is set at “low” when SCL is “high”.
P : Stop condition; SDA is set at “high” when SCL is “high”.
A : Acknowledge; Signal sent from the slave.
LSB
P
9
STOP
Data is transmitted by MSB-first. One data unit consists of 8 bits, to which the acknowledge signal,
which indicates that the data has been accepted by the slave, is attached at the end. Normally, the
slave ∗1 IC receives data at the rising edge of SCL and the master ∗2 IC changes data at the falling edge
of SCL. The actual data format is as follows.
Slave address
S
40H
A
Subaddress
∗∗H
A DATA0 A DATA1 A DATA2 A P
BIT8
BIT7
Slave address configuration
BIT6 BIT5 BIT4
Slave address
BIT3
BIT2
BIT1
R/W
The slave address is an address unique to each IC, and is assigned according to the IC functions. The
upper 7 of the 8 bits are the unique address and the final bit is the R/W bit. The R/W bit indicates read
∗3 when 1 and write ∗4 when 0. 40H is allotted as the slave address for the CXA2055P. (This is write
only and there is no read mode.)
The subaddress is the assigned address within the IC, and is used for the various IC adjustments. The
subaddress is sent just once following the slave address, and is automatically incremented thereafter
until a stop condition is sent.
∗1 Slave : An IC that is placed under the control of the master.
In a normal system, all devices excluding the central microcomputer are slaves.
∗2 Master : A central microcomputer or other controlling IC.
∗3 Read : Mode where data is read from master to slave.
∗4 Write : Mode where data is written from master to slave.
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