參數(shù)資料
型號: LTC3880EUJ-1#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
封裝: 6 X 6 MM, LEAD FREE, PLASTIC, WJJD-2, QFN-40
文件頁數(shù): 34/112頁
文件大?。?/td> 2182K
代理商: LTC3880EUJ-1#TRPBF
LTC3880/LTC3880-1
28
3880fa
OPERATION
A value shown below a field in the following figures is a
mandatory value for that field.
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.
Figure 5. Timing Diagram
Figure 6. PMBus Packet Protocol Diagram Element Key
SDA
SCL
tHD(STA)
tHD(DAT)
tSU(STA)
tSU(STO)
tSU(DAT)
tLOW
tHD(SDA)
tSP
tBUF
START
CONDITION
STOP
CONDITION
REPEATED START
CONDITION
START
CONDITION
tr
tf
tr
tf
tHIGH
3880 F05
SLAVE ADDRESS
DATA BYTE
Wr A
A P
3880 F06
S
7
S
START CONDITION
Sr
REPEATED START CONDITION
Rd
READ (BIT VALUE OF 1)
Wr
WRITE (BIT VALUE OF 0)
x
SHOWN UNDER A FIELD INDICATES THAT THAT
FIELD IS REQUIRED TO HAVE THE VALUE OF x
A
ACKNOWLEDGE (THIS BIT POSITION MAY BE 0
FOR AN ACK OR 1 FOR A NACK)
P
STOP CONDITION
PEC PACKET ERROR CODE
MASTER TO SLAVE
SLAVE TO MASTER
CONTINUATION OF PROTOCOL
8
1 1
1
x
1
...
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