BU9897GUL-W_11 Datasheet, PDF (9/17 Pages) Rohm – High Reliability Series Serial EEPROMs WL-CSP EEPROM family I2C BUS

BU9897GUL-W
Technical Note
○Notes on write cycle continuous input
SDA
LINE
S
W
T
R
A
R
T
SLAVE
ADDRESS
I
T
E
WORD
ADDRESS(n)
DATA(n)
1 0 1 0 A2 A1A0
WA
7
WA
0
D7
D0
S
T
DATA(n+31)
O
P
D0
RA
A
A
A
/C
C
C
C
WK
K
K
K
Fig.35 Page write cycle
At STOP (stop bit)
write starts.
1 0 10
Next command
tWR(maximum：5ms)
Command is not accepted
for this period.
○Notes on page write cycle
List of numbers of page write
Product number
Number of pages
BU9897GUL-W
64Byte
The above numbers are maximum bytes for respective
types. Any bytes below these can be written.
In the case of BU9897GUL-W, 1 page = 64bytes,
but the page write cycle write time is 5ms at maximum
for 64byte bulk write. It does not stand 5ms
at maximum × 64byte = 320ms(Max.).
○Internal address increment
Page write mode
WA12 -----
0 -----
0 -----
0 -----
WA5
0
0
0
WA4
0
0
0
WA3
0
0
0
WA2
0
0
0
WA1
0
0
1
WA0
0
1
0
1Eh ^{0 ----- 0}
0 ----- 0
0 ----- 0
1
1
1
0
1
1
1
1
1
0
0
0
0
0
0
Iincrement
Significant bit is fixed.
No digit up
For example, when it is started from address 1Eh,
therefore, increment is made as below,
1Eh→1Fh→00h→01h･･･
* 1Eh･･･16 in hexadecimal, therefore,
00011110 becomes a binary number.
○Write protect (WP) terminal
・Write protect (WP) function
When WP terminal is set Vcc (H level), data rewrite of all address is prohibited. When it is set GND (L level),
data rewrite of all address is enabled. Be sure to connect this terminal to Vcc or GND, or control it to H level or L level.
Do not use it open. At extremely low voltage at power ON/OFF, by setting the WP terminal 'H', mistake write can be
prevented. During tWR, set the WP terminal always to 'L'. If it is set 'H', write is forcibly terminated.
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9/16
2011.10 - Rev.A