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LA72730_10 Datasheet(PDF) 7 Page - Sanyo Semicon Device

Part No. LA72730_10
Description  Audio/Video Switch
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Maker  SANYO [Sanyo Semicon Device]
Homepage  http://www.ssdc-jp.com/eng/
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LA72730
Continued from preceding page.
DC : voltage
Pin No.
Pin Name
Function
AC : level
Equivalent Circuit
18
POVIDEO
Video output
DC : 1.4V
19
20
POALCR
POALCL
Audio output
DC : 2.4V
200
Ω
10k
Ω
22
PCREG
Reference voltage
DC : 2.4V
500
Ω
10k
Ω
9.6k
Ω
1k
Ω
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.
Fig.1 DATA STRUCTURE
START Condition
Slave Address
R/W
L
ACK
Control data
ACK
STOP condition
(3) Initialize
This IC is initialized for circuit protection. Initial condition is shown on bitmap.
No.A1059-7/8




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