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BR24T □□□□ Series
Technical Note
● Write Command
○ Write cycle
? Arbitrary data is written to EEPROM. When to write only 1 byte, byte write is normally used, and when to write
continuous data of 2 bytes or more, simultaneous write is possible by page write cycle. The maximum number of write
bytes is specified per device of each capacity. Up to 256 arbitrary bytes can be written.(In the case of BR24T1M-W)
S
W
T
A
R
I
S
T
SDA
LINE
R
T
SLAVE
ADDRESS
1 0 1 0 A2 A1 A0
T
E
WA
7
WORD
ADDRESS
WA
0
D7
DATA
D0
O
P
As for WA7, BR24T01-W becomes Don't care.
R A
A
A
Note)
/
C
C
C
W K
K
K
Fig.38 Byte write cycle
(BR24T01/02/04/08/16-W)
S
W
T
A
R
I
S
T
R
T
SLAVE
ADDRESS
T
E
1st WORD
ADDRESS
2nd WORD
ADDRESS
DATA
O
P
*1
As for WA12, BR24T32-W becomes Don't care.
SDA
As for WA13, BR24T32/64-W becomes Don't care.
LINE
1 0 1 0 A2 A1 A0
Note)
R A
/ C
WA WA WA WA WA
15 14 13 12 11
*1
A
C
WA
0
A
C
D7
D0
A
C
As for WA14, BR24T32/64/128-W becomes Don't care.
As for WA15, BR24T32/64/128/256-W becomes Don't care.
W K
K
K
K
Fig.39 Byte write cycle
(BR24T32/64/128/256/512/1M-W)
S
W
T
R
S
A
R
T
SLAVE
ADDRESS
I
T
E
W ORD
A D D R E S S (n )
D A TA (n)
*2
D A TA (n +1 5 )
T
O
P
SDA
L IN E
1 0 1 0 A 2 A 1 A 0
WA
7
WA
0
D7
D0
D0
*1
*2
As for WA7, BR24T01-W becomes Don't care.
As for BR24T01/02-W becomes (n+7)
注 )
R A
/ C *1
W K
A
C
K
A
C
K
A
C
K
Fig.40 Page write cycle
(BR24T01/02/04/08/16-W)
SDA
S
T
A
R
T
SLAVE
ADDRESS
W
R
I
T
E
1st WORD
ADDRESS(n)
2nd WORD
ADDRESS(n)
DATA(n)
*2
DATA(n+31)
S
T
O
P
*1
As for WA12, BR24T32-W becomes Don't care.
As for WA13, BR24T32/64-W becomes Don't care.
As for WA14, BR24T32/64/128-W becomes Don't care.
As for WA15, BR24T32/64/128/256-W becomes Don't care.
LINE
1 0 1
0 0
0 A2 A1 A0
注 )
R A
/ C
W K
WA WA WA WA WA
15 14 13 12 11
*1
A
C
K
WA
0
A
C
K
D7
D0
A
C
K
D0
A
C
K
*2
As for BR24T128/256-W becomes (n+63)
As for BR24T512-W becomes (n+127)
As for BR24T1M-W becomes (n+255)
Fig.41 Page write cycle
Note)
(BR24T32/64/128/256/512/1M-W)
*1 *2 *3
1 0 1 0 A 2 A 1 A 0
Fig.42 Difference of slave address of each type
*1 In BR24T16-W, A2 becomes P2.
*2 In BR24T08/16-W, A1 becomes P1.
*3 In BR24T04/08/16/1M-W A0 becomes P0.
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8/21
2011.03 - Rev.A
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