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LTC4258 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4258
Description  Single PoE PSE Controller High Capacitance Legacy Device Detection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4258 Datasheet(HTML) 11 Page - Linear Technology

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LTC4274
11
4274fa
I2C TIMING DIAGRAMS
Figure 6. Writing to a Register
Figure 7. Reading from a Register
SCL
SDA
4274 F06
00
1
AD3 AD2 AD1 AD0
A7
A6
A5
A4
A3
A2
A1
A0
R/W ACK
D7
D6
D5
D4
D3
D2
D1
D0
ACK
ACK
START BY
MASTER
ACK BY
SLAVE
ACK BY
SLAVE
ACK BY
SLAVE
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
REGISTER ADDRESS BYTE
FRAME 3
DATA BYTE
STOP BY
MASTER
SCL
SDA
00
1
AD3 AD2 AD1 AD0
A7
A6
A5
A4
A3
A2
A1
A0
R/W ACK
ACK
00
1
AD3 AD2 AD1 AD0
D7
D6
D5
D4
D3
D2
D1
D0
R/W ACK
ACK
START BY
MASTER
ACK BY
SLAVE
ACK BY
SLAVE
4274 F07
STOP BY
MASTER
REPEATED
START BY
MASTER
ACK BY
SLAVE
NO ACK BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
REGISTER ADDRESS BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE
Figure 8. Reading the Interrupt Register (Short Form)
Figure 9. Reading from Alert Response Address
SCL
SDA
4274 F08
01
0
AD3 AD2 AD1 AD0
D7
D6
D5
D4
D3
D2
D1
D0
R/W ACK
ACK
START BY
MASTER
ACK BY
SLAVE
NO ACK BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE
STOP BY
MASTER
SCL
SDA
4274 F09
00
1
1
0
AD3
0
0
0
0
1
AD2 AD1 AD0
R/W ACK
ACK
1
START BY
MASTER
ACK BY
SLAVE
NO ACK BY
MASTER
FRAME 1
ALERT RESPONSE ADDRESS BYTE
FRAME 2
SERIAL BUS ADDRESS BYTE
STOP BY
MASTER


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