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LTC4331 датащи(PDF) 19 Page - Analog Devices

номер детали LTC4331
подробное описание детали  I2C Slave Device Extender Over Rugged Differential Link
PDF  26 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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LTC4331 датащи(HTML) 19 Page - Analog Devices

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LTC4331
19
Rev 0
For more information www.analog.com
APPLICATIONS INFORMATION
Figure14. Write Byte
Figure15. Write Byte + PEC
Figure16. Read Byte
FROM MASTER TO SLAVE
S
W
DEVICE ADDR
REGISTER
DATA
FROM SLAVE TO MASTER
4331 F14
S: START
Sr: REPEATED START
W: WRITE BIT (ACTIVE LOW)
A: (N)ACK BIT
P: STOP
DEVICE ADDRESS = 3Eh. ACCESSING THE CONFIG REGISTER
A
A
A
0
3Eh
00h
01h
0
0
0
P
A
0
S
W
DEVICE ADDR
REGISTER
DATA
PEC
9Ah
4331 F15
A
A
A
0
3Eh
00h
01h
0
0
0
P
A
S
Sr
W
DEVICE ADDR
REGISTER
DATA
4331 F16
A
A
A
0
W
1
3Eh
00h
01h
DEVICE ADDR
3Eh
0
0
0
1
P
Figure17. Read Byte + PEC
Figure18. Receive Byte
Figure19. Receive Byte + PEC
A
S
Sr
W
DEVICE ADDR
REGISTER
DATA
4331 F17
A
A
A
0
W
1
3Eh
00h
01h
DEVICE ADDR
3Eh
0
0
0
1
P
A
0
PEC
96h
S DEVICE ADDR
DATA
4331 F18
A
A
W
1
3Eh
01h
0
1
P
S DEVICE ADDR
DATA
4331 F19
A
A
W
1
3Eh
01h
0
1
P
A
0
PEC
4Ch
both pins are unconnected, the internal slave is disabled.
The internal slave device recognizes the SMBus Write Byte
and Read/Receive Byte protocols with or without Packet
Error Correction (PEC) as shown in Figures 14 to 19.
The PEC byte is calculated as a CRC-8 checksum over all
bytes between the START and STOP conditions excluding
the ACK/NACK and Sr bits and last CRC byte. The polyno-
mial used is x8 + x2 + x + 1 initialized to zero.



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