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PT2318 V1.2

- 7 -

March, 2006

Sound Fader Controller IC

PT2318

INTERFACE PROTOCOL

The interface protocol consists of the following:

1. START Condition

2. Chip Address Byte=80H

3. ACK=Acknowledge Bit

4. Data Byte

5. STOP Condition

Please refer to the diagram below:

MSB

First Byte

LSB

START

1 0 0 0 1 0 0 0

Subaddress

ACK

Data Byte

ACK STOP

Chip Address

Notes:

1. ACK=ACKNOWLEDGE

2. Max. Clock Speed=100K Bits/S

The SUBADDRESS is the Second Byte transmitted following the CHIP ADDRESS Byte. Please refer

to the table below.

Note: These are Significant SUBADDRESS bits.

The last bits of SUBADDRESS are named “specific bit”. When more than one data bit send to PT2318,

the SUBADDRESS will increase automatically depend on specific bit. It is unnecessary to send to

SUBADDRESS, data bit will fill in SUBADDRESS bit. Please refer to following table.

START

Chip

Address

ACK

Sub

Address

ACK

Data

Byte

ACK

Data

Byte

ACK

Data

Byte

ACK

Data

Byte

ACK STOP

Start

80H

00H

Corresp

onding

Sub

Address

00H

Corresp

onding

Sub

Address

01H

Corresp

onding

Sub

Address

02H

Correspo

nding

Sub

Address

03H

End

MSB

LSB

Function

7

6

5

4

3

2*

1*

0*

0

0

0

0

0

0

0

0

Volume/Loudness

0

0

0

0

0

0

0

1

Fader: Front, Right

0

0

0

0

0

0

1

0

Fader: Front, Left

0

0

0

0

0

0

1

1

Fader: Rear, Right

0

0

0

0

0

1

0

0

Fader: Rear, Left

0

0

0

0

0

1

0

1

Bass

0

0

0

0

0

1

1

0

Treble

0

0

0

0

0

1

1

1

Selector Switch