Datasheet

LTC6803-2/LTC6803-4

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OPERATION

Revision Code

The diagnostic register group contains a 2-bit revision

code. If software detection of device revision is neces-

sary, then contact the factory for details. Otherwise, the

code can be ignored. In all cases, however, the values of

all bits must be used when calculating the packet error

code (PEC) byte on data reads.

Bus Protocols

There are 6 different protocol formats, depicted in Table 3

through Table 8. Table 2 is the key for reading the protocol

diagrams.

Table 6. Address Poll Command

4 4 8 8 8

1000 Address PEC Command PEC Poll Data

Table 7. Address Read

4 4 8 8 8 8 … 8 8

1000 Address PEC Command PEC Data Byte Low … Data Byte High PEC

See Serial Command examples

Table 8. Address Write

4 4 8 8 8 8 … 8 8

1000 Address PEC Command PEC Data Byte Low … Data Byte High PEC

Table 4. Broadcast Read

8 8 8 … 8 8

Command PEC Data Byte Low … Data Byte High PEC

A bus collision will occur if multiple devices are on the same serial bus.

Table 5. Broadcast Write

8 8 8 … 8 8

Command PEC Data Byte Low … Data Byte High PEC

Table 2. Protocol Key

PEC Packet Error Code Master-to-Slave

N Number of Bits Slave-to-Master

... Continuation of Protocol Complete Byte of

Data

Table 3. Broadcast Poll Command

8 8

Command PEC Poll Data