BU9880GUL-W_10 Datasheet, PDF (8/17 Pages) Rohm – WL-CSP EEPROM family I2C BUS

BU9880GUL-W
Technical Note
●Write Command
○Write cycle
・Arbitrary data is written to EEPROM. When to write only 1 byte, byte write 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 32 arbitrary bytes can be written.
SDA
LINE
S
W
T
R
A
I
R
SLAVE T
1st WORD
T
ADDRESS E
ADDRESS
1010000
＊ ＊ ＊ WA
12
RA
/C
WK
2nd WORD
ADDRESS
S
T
DATA
O
P
WA _D7
D0
0
A
A
A
C
C
C
K
K
K
Fig.33 Byte write cycle
SDA
LINE
S
W
T
R
A
I
R
SLAVE _T
T ^ADDRESS E
1st WORD
ADDRESS(n)
2nd WORD
ADDRESS(n)
DATA(n)
1 0100 0 0
＊ ＊ ＊ WA
12
RA
/C
WK
WA
0
D7
A
C
K
Fig.34
A
C
K
Page write cycle
D0
A
C
K
S
T
O
DATA(n+31) _P
D0
A
C
K
・Data is written to the address designated by word address (n-th address).
・By issuing stop bit after 8bit data input, write to memory cell inside starts.
・When internal write is started, command is not accepted for tWR (5ms at maximum).
・By page write cycle, the following can be written in bulk: Up to 32 bytes.
(Refer to "Internal address increment of "Notes on page write cycle" in P9/16.)
・As for page write cycle of BU9880GUL-W , after the significant 7 bits of word address, are designated arbitrarily, by
continuing data input of 2 bytes or more, the address of insignificant 5 bits is incremented internally, and data up to 32
bytes can be written.
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2010.11 - Rev.A