BU9847GUL-W_12 Datasheet, PDF (14/28 Pages) Rohm – WLCSP EEPROM

BU9847GUL-W (4Kbit)
Datasheet
○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 0PS ^WA
7
WA
0 ^D7
D0
DATA(n+15)
At STOP (stop bit),
Writ e starts .
S
T
O
P
S
T
A
R
T
D0
10 10
RA
A
A
A
Next command
/C
C
C
C
WK
K
K
K
Figure 34. Page write cycle
t WR (maximum : 5ms)
Command is not accept ed for this period.
Note)
1 0 1 0 A2 0 PS
Figure 35. Difference of each type of slave address
○Notes on page write cycle
List of numbers of page write
Number of Pages
16Byte
Product number
BU9847GUL-W
○Internal address increment
Page write mode
WA7 ----- WA4 WA3
0 ----- 0
0
0 ----- 0
0
0 ----- 0
0
WA2
0
0
0
WA1
0
0
0
WA0
0
0
0
Increment
The above numbers are maximum bytes for respective types. ^{0Eh 0 ----- 0}
1110
Any types below these can be written.
0 ----- 0
1111
1page = 16 bytes, but the page write cycle write time is 5ms at maximum
for 16byte bulk write.
It does not stand 5ms at maximum x 16 bytes = 80ms (Max.).
0 ----- 0
0000
Significant bit is fixed.
No digit up
For example, when it is started from address 0Eh,
therefore, increment is made as below,
0Eh→0Fh→00h→01h ---, which please note.
*0Eh --- 0E in hexadecimal, therefore, 00001110
becomes a binary number.
○Write protect terminal (WP)
・Write protect function
When WP terminal is set Vcc (H level), data rewrite of all addresses is prohibited. When it is set GND (L level), data
rewrite of all addresses 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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TSZ02201-0R2R0G100480-1-2
4.SEP.2012 Rev.001