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LA72730 Datasheet(PDF) 7 Page - Sanyo Semicon Device

Part No. LA72730
Description  Monolithic Linear IC For TV Audio/Video Switch
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Maker  SANYO [Sanyo Semicon Device]

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DC : voltage
Pin No.
Pin Name
AC : level
Equivalent Circuit
Video output
DC : 1.4V
Audio output
DC : 2.4V
Reference voltage
DC : 2.4V
I2C BUS serial interface specification
(1) Data Transfer Manual
This IC adopts control method (I2C-BUS) with serial data, and controlled by two terminals which called SCL (serial
clock) and SDA (serial data).At first, set up
*1 the condition of starting data transfer, and after that, input 8 bit data to
SDA terminal with synchronized SCL terminal clock. The order of transferring is first, MSB (the Most Scale of Bit),
and save the order. The 9th bit takes ACK (Acknowledge) period, during SCL terminal takes “H”, this IC pull down the
SDA terminal. After transferred the necessary data, two terminals lead to set up and of
*2 data transfer stop condition,
thus the transfer comes to close.
*1 Defined by SDA fall down SCL during ‘H’ period.
*2 Defined by SDA rise up SCL during ‘H’ period.
(2) Transfer Data Format
After transfer start condition, transfers slave address (92h : 1001 0010 ) to SDA terminal, control data, then, stop
condition (See figure 1).
Slave address is made up of 7bits, *3 8th bit shows the direction of transferring data, but this IC does not have READ
mode, so that this bit fix to “L”.
Data works with all of bit, transfer the stop condition before stop 8bit transfer, and to stop transfer, it will be canceled
the transfer dates.
*3 It is called R/W bit.
START Condition
Slave Address
Control data
STOP condition
(3) Initialize
This IC is initialized for circuit protection. Initial condition is shown on bitmap.

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