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MM1313AD

I2C BUS Control 5-Input 2-Output AV Switch

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I2C BUS

I2C BUS Control 5-Input 2-Output AV Switch MM1313

SDA

SCL

S 1 23 45 6 78A123 8A P

S:Start Condition

P:Stop Condition

A:Acknowledge

The I2C BUS is a BUS system developed by Philips for internal use in equipment. Data transmission is carried

out by the two SDA and SCL lines, in byte units, with the MSB first from start condition.

[Control Register]

The control register contains data sent from the master in order to determine the status of each switch.

Slave address

R/W

Control register 1

Control register 2

S

A

A

AP

1 0 0 1 0 0 0/1 0 b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0

Address byte

Control data

The data format is set as shown in the figure above. The first 7 bits in the address byte are allocated to the

slave address, and the remaining 1 bit is allocated to the read/write bit. The read/write bit is set at 0 when

using as a control register.

The MM1313 slave address can be selected as 90H/92H depending on the status of the ADR pin. When ADR

pin is low it is 90H.

The relationship between the control register bits and switch control is as shown below.

b7 b6

Audio S/Comp

Gain Select

b5 b4 b3

Video-Select

b2 b1 b0

Audio-Select

The control register bits are reset to 0 when power is applied.

MM1313 control is carried out by the 3-byte structure of the 1 address byte and 2 control data bytes. The first

byte in the control data is control data for output 1, and the remaining 1 byte is control data for output 2.

All of the remaining data (fourth byte and after) are ignored.

Refer to the separate tables for details on switch control.

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