ltc4270 Linear Technology Corporation, ltc4270 Datasheet - Page 12

• Manufacturer Part Number: ltc4270
• Description: 12-port Poe/poe+/ltpoe++ Pse Controller
• Manufacturer: Linear Technology Corporation

LTC4270/LTC4271
I
12
SDA
SCL
2
C TIMING DIAGRAMS
AD6
START BY
MASTER
1
SERIAL BUS ADDRESS BYTE
0
SDA
SCL
AD3 AD2 AD1 AD0
FRAME 1
AD6
START BY
MASTER
1
SERIAL BUS ADDRESS BYTE
R/W ACK
0
AD3 AD2 AD1 AD0
FRAME 1
A7
ACK BY
SLAVE
A6
REGISTER ADDRESS BYTE
A5
FRAME 2
R/W ACK
A4
A3
Figure 7. Reading from a Register
Figure 6. Writing to a Register
A2
A7
ACK BY
SLAVE
ACK BY
A1
A6
SLAVE
REGISTER ADDRESS BYTE
A0
A5
FRAME 2
ACK
A4
A3
AD6
A2
ACK BY
A1
1
REPEATED
START BY
MASTER
SLAVE
SERIAL BUS ADDRESS BYTE
A0
0
ACK
AD3 AD2 AD1 AD0
FRAME 1
D7
D6
D5
DATA BYTE
R/W ACK
FRAME 3
D4
D3
D2
D7
ACK BY
SLAVE
D1
D6
ACK BY
SLAVE
D0
D5
DATA BYTE
FRAME 2
D4
ACK
D3
STOP BY
MASTER
42701 F06
D2
NO ACK BY
MASTER
D1
D0
ACK
42701 F07
STOP BY
MASTER
42701f