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BU9897GUL-W (128Kbit)
○ Notes on write cycle continuous input
Datasheet
S
T
A
R
T
SLAVE
ADDRESS
W
R
I
T
E
WORD
ADDRESS(n)
DATA(n)
DATA(n+31)
S
T
O
P
At STOP (stop bit)
write starts.
SDA
LINE
1 0 1 0 A2 A1 A0
WA
7
WA
0
D7
D0
D0
1 0 1 0
R A
/ C
W K
A
C
K
A
C
K
A
C
K
Next command
tWR(maximum ： 5ms)
Command is not accepted
for this period.
Figure 33. Page write cycle
○ Notes on page write cycle
List of numbers of page write
Product number Number of pages
○ Internal address increment
Page write mode
BU9897GUL-W
64Byte
WA12 -----
WA5 WA4
WA3 WA2 WA1 WA0
The above numbers are maximum bytes for respective
types. Any bytes below these can be written.
0 -----
0 -----
0 -----
0 0
0 0
0 0
0 0 0 0
0 0 0 1
0 0 1 0
Iincrement
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.).
1Eh
0
-----
0
1
1
1
0
1
0
0
-----
-----
0
0
1
0
1
0
1
0
1
0
0
0
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.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
14/22
TSZ02201-0R2R0G100500-1-2
4.SEP.2012 Rev.001
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