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MM1311BD

I2C BUS Control 4-Input 1-Output AV Switch

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I2C BUS

SDA

I2C BUS Control 4-Input 1-Output AV Switch MM1311

SCL

S 1 2 3 4 5 6 7 8 A 1 2 3 ·· 8 A P

S:Start Condition

P:Stop Condition

ACK: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

S

A

AP

1 0 0 1 0 0 0/1 0

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 MM1311 slave address can be selected as 90H/92H depending on the status of the ADR pin. When the

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.

MM1311 control is carried out by the 2-byte structure of the 1 address byte and 1 control data byte. All of the

remaining data (third byte and after) are ignored.

Refer to the separate tables for details on switch control.

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