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BU99901GUZ-W (32Kbit)
○ Notes on write cycle continuous input
At STOP (stop bit)
write starts.
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
S
T
A
R
T
SDA
LINE
1 0 1 0 P2 P1 P0
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)
Figure 35. Page write cycle
Command is not ac cepted for this period.
○ Notes on page write cycle
○ Internal address increment
Page write mode
List of numbers of page write
WA11 ----- WA5 WA4 WA3 WA2 WA1 WA0
Number of pages
Product number
32Byte
BU99901GUZ-W
0 ----- 0 0 0 0 0 0
0 ----- 0 0 0 0 0 1
0 ----- 0 0 0 0 1 0
increment
The above numbers are maximum bytes for respective types.
Any bytes below these can be written.
In the case of BU99901GUZ-W, 1 page = 32bytes,
but the page write cycle write time is 5ms at maximum
for 32byte bulk write.
IEh
0
0
0
-----
-----
-----
0
0
0
1
1
0
1
1
0
1
1
0
1
1
0
0
1
0
It does not stand 5ms at maximum ×
32byte = 160ms(Max.).
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 ??? , which please note.
* 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
15/23
TSZ02201-0R2R0G100280-1-2
4.SEP.2012 Rev.001
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