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BR24A Datasheet(PDF) 9 Page - Rohm

Part No. BR24A
Description  High Reliability Series EEPROMs I2C BUS
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BR24A Datasheet(HTML) 9 Page - Rohm

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BR24A□□-WM series
Technical Note
9/17
www.rohm.com
2009.08 - Rev.C
© 2009 ROHM Co., Ltd. All rights reserved.
Notes on write cycle continuous input
Notes on page write cycle
List of numbers of page write
Number of Pages
8Byte
16Byte
32Byte
Product
number
BR24A01A-WM
BR24A02-WM
BR24A04-WM
BR24A08-WM
BR24A16-WM
BR24A32-WM
BR24A64-WM
The above numbers are maximum bytes for respective types.
Any bytes below these can be written.
In the case BR24A02-WM, 1 page=8bytes, but the page write cycle write time is 5ms at maximum for 8byte bulk write.
It does not stand 5ms at maximum × 8byte=40ms(Max.).
Internal address increment
Page write mode (in the case of BR24A02-WM)
For example, when it is started from address 06h,therefore, increment is made as below,
06h → 07h → 00h → 01h ---, which please note.
*06h・・・06 in hexadecimal, therefore, 00000110 becomes a binary number.
Write protect (WP) terminal
Write protect (WP) 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 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.
W
R
I
T
E
S
T
A
R
T
R
/
W
A
C
K
S
T
O
P
WORD
ADDRESS(n)
DATA(n)
SDA
LINE
A
C
K
DATA(n+7)
A
C
K
SLAVE
ADDRESS
10
0
1A0
A1
A2
WA
7
D0
D7
D0
*1
A
C
K
Note)
WA
0
1
1
00
Next command
tWR(maximum : 5ms)
Command is not accepted for this period.
At STOP (stop bit),
write starts.
*2
*3
S
T
A
R
T
*1 BR24A01A-WM becomes Don’t care.
*2 BR24A04-WM, BR24A08-W, and BR24A16-WM become (n+15).
*3 BR24A32-WM and BR24A64-WM become (n+31).
1 0
0
1A 0
A1
A2
*1 *2 *3
Fig.42 Difference of each type of slave address
Fig.40 Page write cycle
*1 In BR24A16-WM, A2 becomes P2.
*2 In BR24A08-WM, BR24A16-WM, A1 becomes P1.
*3 In BR24A04-WM, A0 becomes PS, and in BR24A08-WM
and in BR24A16-WM, A0 becomes P0.
Note)
WA7 ----- WA4 WA3
WA2 WA1 WA0
0
-----
0
0
0
0
0
0
-----
0
0
0
0
1
0
-----
0
0
0
1
0
0
-----
0
0
1
1
0
0
-----
0
0
1
1
1
0
-----
0
0
0
0
0
06h
Significant bit is fixed.
No digit up
Increment


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