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PT2257L Datasheet(PDF) 5 Page - Princeton Technology Corp

Part # PT2257L
Description  Electronic Volume Controller IC
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Manufacturer  PTC [Princeton Technology Corp]
Direct Link  http://www.princeton.com.tw
Logo PTC - Princeton Technology Corp

PT2257L Datasheet(HTML) 5 Page - Princeton Technology Corp

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Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PT2257 V1.3
- 5 -
December, 2006
Electronic Volume Controller IC
PT2257
BYTE FORMAT
Every byte transmitted to the SDA Line consists of 8 bits. Each byte must be followed by an
Acknowledge 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.
SD A
SC L
Start
MSB
A cknowledgment
from R eceiver
12
37
8
9
4
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.


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