LTC4270 Datasheet, PDF(12/32 Page) Linear Technology – 12-Port PoE/PoE+/LTPoE++ PSE Controller

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LTC4270 Datasheet, PDF (12/32 Pages) Linear Technology – 12-Port PoE/PoE+/LTPoE++ PSE Controller

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LTC4270/LTC4271

I2C TIMING DIAGRAMS

SCL

SDA

AD6 1 0 AD3 AD2 AD1 AD0 R/W ACK A7 A6 A5 A4 A3 A2 A1 A0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK

START BY

MASTER

ACK BY

SLAVE

ACK BY

SLAVE

ACK BY

SLAVE

STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

FRAME 3

DATA BYTE

42701 F06

Figure 6. Writing to a Register

SCL

SDA

AD6 1 0 AD3 AD2 AD1 AD0 R/W ACK A7 A6 A5 A4 A3 A2 A1 A0 ACK

AD6 1 0 AD3 AD2 AD1 AD0 R/W ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK BY

SLAVE

ACK BY

SLAVE

FRAME 2

REPEATED

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK BY

SLAVE

NO ACK BY

MASTER

FRAME 2

DATA BYTE

STOP BY

MASTER

42701 F07

Figure 7. Reading from a Register

42701f

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