ADM1041
19
9
1
9
SCLK
SDATA
A6
A5
A4
A3
A2
A1
A0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
SCLK (CONTINUED)
ACK. BY
ADM1041
1
FRAME 2
ADDRESS POINTER REGISTER BYTE
9
ACK. BY
ADM1041
SDATA (CONTINUED)
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1041
STOP BY
MASTER
FRAME 3
DATA BYTE
Figure 25. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
1
9
1
9
SCLK
SDATA
A6
A5
A4
A3
A2
A1
A0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADM1041
FRAME 2
ADDRESS POINTER REGISTER BYTE
ACK. BY
ADM1041
STOP BY
MASTER
Figure 26. Writing to the Address Pointer Register Only
1
9
1
9
SCLK
SDATA
A6
A5
A4
A3
A2
A1
A0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADM1041
FRAME 2
DATA BYTE FROM ADM1041
ACK. BY
ADM1041
STOP BY
MASTER
Figure 27. Reading Data from a Previously Selected Register
Table 6. Device SMBus Addresses
ADD1
0
0
0
1
1
1
ADD0
GND
V DD
NC
GND
V DD
NC
A2
0
0
1
0
0
1
A1
0
0
0
1
1
0
A0
0
1
0
0
1
1
Target Device
0
1
4
2
3
5
Note: ADD1 is low by default. To access the additional three addresses it is necessary to set Config 4 < 1 > high and then perform a power cycle to allow the new
address to be latched after the EEPROM download. Refer to the section on Extended SMBUS Addressing for more details.
Rev. A | Page 35 of 64
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