BU9844GUL-W_10 Datasheet, PDF (8/19 Pages) Rohm – WL-CSP EEPROM family I2C BUS

BU9844GUL-W
Technical Note
●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.
S
W
T
R
A
R
T
SLAVE
ADDRESS
I
T
E
WORD
ADDRESS
S
T
DATA
O
P
SDA
LINE
1 0 1 0 P2 P1 P0
WA
7
WA
0
D7
D0
RA
A
A
/C
C
C
WK
K
K
WP
SDA
LINE
S
W
T
R
A
R
T
SLAVE
ADDRESS
I
T
E
Fig.34 Byte write cycle
WORD
ADDRESS(n)
DATA(n)
1 0 1 0 P2 P1 P0
WA
7
WA
0
D7
D0
RA
A
A
/C
C
C
WK
K
K
WP
S
T
DATA(n+15)
O
P
D0
A
C
K
Fig.35 Page write cycle
・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 16 bytes.
And when data of the maximum bytes or higher is sent, data from the first byte is overwritten.
(Refer to “Internal address increment” of “Notes on page write cycle” in P8/16.)
・As for page write cycle of BU9844GUL-W, after page select bit (PS) of slave address is designated arbitrarily, by
continuing data input of 2 bytes or more, the address of insignificant 4 bits is incremented internally, and data up to 16
bytes can be written.
Note)
1 0 1 0 P2P1P0
Fig.36 Difference of slave address of each type
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8/18
2010.09 - Rev.A