Datasheet

LTC3883/LTC3883-1
29
3883fa
For more information www.linear.com/LTC3883
Figure 7. Write Byte Protocol
Figure 8. Write Word Protocol
Figure 9. Write Byte Protocol with PEC
Figure 10. Write Word Protocol with PEC
OPERATION
Table 1. Data Format Terminology
PMBus
TERMINOLOGY MEANING
TERMINOLOGY FOR: SPECS,
GUI, APPLICATION NOTES
ABBREVIATIONS FOR
SUMMARY COMMAND TABLE
FOR MORE DETAIL REFER TO
THE DATA FORMAT SECTION
OF TABLE 2
Linear Linear Linear_5s_11s L11 Page 35
Linear (for Voltage
Related Commands)
Linear Linear_16u L16 Page 35
Direct Direct-Manufacturer
Customized
DirectMfr CF Page 35
Hex Hex I16
ASCII ASCII ASC
Register Fields Reg Reg
SLAVE ADDRESS COMMAND CODE DATA BYTEWr A A A P
3883 F07
S
7 8 81 1 1 1 11
SLAVE ADDRESS COMMAND CODE DATA BYTE LOWWr A A A P
3883 F08
S
7 8 8 1
DATA BYTE HIGH
81 1 1 1 11
A
SLAVE ADDRESS COMMAND CODE DATA BYTEWr A A A P
3883 F09
S
7 8 8 1
PEC
81 1 1 1 11
A
SLAVE ADDRESS COMMAND CODE DATA BYTE LOWWr A A A P
3883 F10
S
7 8 8 1
DATA BYTE HIGH
8
PEC
811 1 1 1 11
A A
The data formats implemented by PMBus are:
n
Master transmitter transmits to slave receiver. The
transfer direction in this case is not changed.
n
Master reads slave immediately after the first byte. At
the moment of the first acknowledgment (provided by
the slave receiver) the master transmitter becomes a
master receiver and the slave receiver becomes a slave
transmitter.
n
Combined format. During a change of direction within
a transfer, the master repeats both a start condition
and the slave address but with the R/W bit reversed.
In this case, the master receiver terminates the transfer
by generating a NACK on the last byte of the transfer
and a STOP condition.
Examples of these formats are shown in Figures 7-16.