adt7476a Analog Devices, Inc., adt7476a Datasheet - Page 13

• Manufacturer Part Number: adt7476a
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

It is possible to read a data byte from a data register without
first writing to the address pointer register, if the address
pointer register is already at the correct value. However, it is not
possible to write data to a register without writing to the
address pointer register, because the first data byte of a write is
always written to the address pointer register.
SDA
SCL
SDA
SCL
START BY
MASTER
START BY
SDA
SCL
MASTER
START BY
MASTER
1
0
1
0
Figure 18. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
1
0
1
1
1
SERIAL BUS ADDRESS BYTE
SERIAL BUS ADDRESS BYTE
0
0
SERIAL BUS ADDRESS BYTE
0
1
FRAME 1
1
FRAME 1
1
FRAME 1
1
1
Figure 20. Reading Data from a Previously Selected Register
SDA (CONTINUED)
1
SCL (CONTINUED)
Figure 19. Writing to the Address Pointer Register Only
A1
A1
A1
A0
A0
A0
R/W
R/W
ADT7476A
ADT7476A
ACK. BY
Rev. 0 | Page 13 of 72
ACK. BY
R/W
ADT7476A
ACK. BY
9
9
D7
9
1
D7
D7
1
1
D7
D6
1
In addition to supporting the send byte and receive byte
protocols, the ADT7476A also supports the read byte protocol.
See Intel’s System Management Bus Specifications Rev. 2 for more
information.
If several read or write operations must be performed in
succession, the master can send a repeat start condition instead
of a stop condition to begin a new operation.
D6
D6
D6
D5
ADDRESS POINTER REGISTER BYTE
D5
D5
ADDRESS POINTER REGISTER BYTE
DATA BYTE FROM ADT7476A
D5
D4
D4
DATA BYTE
D4
FRAME 3
D4
D3
FRAME 2
FRAME 2
D3
D3
FRAME 2
D3
D2
D2
D2
D2
D1
D1
D1
D1
D0
ADT7476A
D0
D0
ACK. BY
NO ACK. BY
MASTER
ADT7476A
D0
ACK. BY
9
ADT7476A
9
9
ACK. BY
STOP BY
MASTER
9
STOP BY
MASTER
STOP BY
MASTER
ADT7476A