m52791fp Renesas Electronics Corporation., m52791fp Datasheet - Page 6

• Manufacturer Part Number: m52791fp
• Description: 2 Av Switch With I C Bus Control
• Manufacturer: Renesas Electronics Corporation.

M52791SP/FP
I
I
clock) realize functions of start, stop, transferring data, synchronization and arbitration. The output stages of device
connected to the bus must have an open drain or open collector in order to perform the wired-AND function.
Note:
Every byte put on the SDA line must be 8-bits long. Each byte has to be followed by an acknowledge bit. Data is
transferred with the most significant bit (MSB) first. 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.
Control
This IC controls 2-channel switches with 2-byte data (DATA1 and DATA2). Video switches are controlled by DATA1.
Audio switches are controlled by DATA2.
Slave address
Rev.2.00 Sep 14, 2006 page 6 of 13
2
2
C Bus (Inter IC Bus) is multi master bus system developed by PHILIPS. Two wires (SDA-serial data, SCL-serial
C Bus
SDA
SCL
S: Start condition, a high to low transition of the SDA line while SCL is high
P: Stop condition, a low to high transition of the SDA line while SCL is high
A: Acknowledge
1
0
S
0
1
MSB
1
S
0
S: Start
A: Acknowledge
P: Stop
SLAVE ADDRESS
2
0
3
X
0
4
5
R/W bit
Usually "0" (W: Master transmitter transmits to slave receiver)
Possible to select
22 pin High: 1, Low: 0
A
6
DATA1
7
LSB
8
A
9
A
DATA2
MSB
1
2
A
P
LSB
9
A
P