PT2259 查看數據表（PDF） - Princeton Technology

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PT2259

Volume Controller IC

Princeton Technology 

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Volume Controller IC

PT2259

BYTE FORMAT

Every byte transmitted to the DATA line consists of 8 bits and each byte must be followed by an

“acknowledge” bit. The MSB is transmitted first.

ACKNOWLEDGE SIGNAL

During the ninth clock pulse, the microprocessor puts a resistive “high” level on the DATA line. If the

peripheral audio processor (PT2259) acknowledges, it will pull the DATA line from a “high” state to a

“low” state during this acknowledge clock phase so that the DATA line is in a stable “low” state during

this clock pulse. Please refer to the diagram below.

The audio processor that has been address (PT2259) must generate an “acknowledge” signal after

receiving each byte or the DATA line will remain at the “high” level during the ninth clock pulse.

TRANSMISSION WITHOUT ACKNOWLEDGE

If you do not wish the audio processor (PT2259) to detect the “acknowledge” signal, a simpler

microprocessor transmission method can be used: after PT2259 has received a byte wait for one clock

pulse and do not acknowledge it. If this approach is used, however, there is a greater chance for faulty

operations to occur and noise immunity will be decreased.

PT2259 V1.2

-5-

June, 2005

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