M52797SP Datasheet, PDF (5/9 Pages) Mitsubishi Electric Semiconductor – AV SWITCH with I2C BUS CONTROL

PRELIMINARY
Notice. This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI ICs (AV COMMON)
M52797SP/FP
AV SWITCH with I2C BUS CONTROL
I² C BUS
I ²C BUS(Inter IC BUS)is multi master bus system developed by PHILIPS . Two wires ( SDA - serial data,
SCL - serial 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 .
SDA
SCL
MSB
A
LSB
MSB
A
LSB
S
12345678912
P
9
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 ; Acknownledge
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 channel switchs with 1-byte data ( DATA1) .
S SLAVE ADDRESS A DATA1 A P
S : Start
A : Acknowledge
P : Stop
SLAVE ADDRESS
1 0 0 1 0 0X 0
R/W bit
Usually ` 0 ` ( W : Master transmitter transmits to slave
receiver )
Possible to select
17PIN Hi:1,Lo:0
MITSUBISHI
(at 28P4B)
5 -9
AUG.'98