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Princeton Technology Corp.
6-Channel Electronic Volume Controller IC Preliminary
PT2258
Interface Protocol
The interface protocol consists of the following:
· A Start Condition
· A Chip Address Byte including the PT2258 address. The 8th Bit of the Byte must be “0”. PT2258
must always acknowledge the end of each transmitted byte.
· A Data Sequence (N-Bytes + Acknowledge)
· A Stop Condition
Please refer to the diagram below:
PT2258 Address
Software Specification
PT2258 ADDRESS CODE
PT2258 Address Code depends on the state of CODE1 (Pin No. 17) and CODE2 (Pin No.4). If CODE1
or CODE2 is connected to Vcc, then CODE1 or CODE2 is set to “1”. If CODE1 or CODE2 is con-
nected to the Ground, it is set to “0”. Please refer to the information below:
Condition 1: When CODE1=”1” and CODE2=”1”:
CODE1
1
CODE2
1
Then, the PT2258 Address Code is (8CH):
1
0
0
0
1
1
0
0
MSB
LSB
PT2258 pre1.0
7
Updated July 2000
PTC [ PRINCETON TECHNOLOGY CORP ]
