PT2258(2000) 查看數據表（PDF） - Princeton Technology

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PT2258
(Rev.:2000)

6-Channel Electronic Volume Controller IC

Princeton Technology 

Princeton Technology Corp.

Tel : 886-2-29162151

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

6-Channel Electronic Volume Controller IC Preliminary

PT2258

Byte Format

Every byte transmitted to the SDA Line consists of 8 bits. Each byte must be followed by an Acknowl-

edge Bit. The MSB is transmitted first.

Acknowledge

During the Acknowledge Clock Pulse, the master (µP) puts a resistive HIGH level on the SDA Line.

The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during the

Acknowledge Clock Pulse so that the SDA Line is in a Stable Low State during this Clock Pulse. Please

refer to the diagram below.

The audio processor that has been addressed has to generate an Acknowledge after receiving each byte,

otherwise, the SDA Line will remain at the High Level during the ninth (9th) Clock Pulse. In this case,

the master transmitter can generate the STOP Information in order to abort the transfer.

Transmission without Acknowledge

If you want to avoid the acknowledge detection of the audio processor, a simpler µP transmission may

be used. Wait one clock and do not check the slave acknowledge of this same clock then send the new

data. If you use this approach, there are greater chances of faulty operation as well as decrease in noise

immunity.

PT2258 pre1.0

6

Updated July 2000

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