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Electronic Volume Controller IC
PT2257
INTERFACE PROTOCOL
The interface protocol consists of the following:
• A Start bit
• A Chip Address Byte=88H
• ACK=Acknowledge bit
• A Data byte
• A Stop bit
Please refer to the diagram below:
PT2257 Address
MSB First Byte
LSB MSB
LSB MSB
LSB
START 1 0 0 0 1 0 0 0 ACK
DATA
ACK
DATA
ACK
DATA TRANSMITTED (N-BYTES+ACKNOWLEDGE)
STOP
Note:
1. ACK=ACKNOWLEDGE
2. MAX. CLOCK SPEED=100K BITS/S
PT2257 V1.3
-6-
December, 2006