BR24G32-3A_16 Datasheet, PDF (15/41 Pages) Rohm – I2C BUS EEPROM (2-Wire)

BR24G32-3A
Write Command
1. Write Cycle
(1) Arbitrary data can be written to EEPROM. When writing only 1 byte, Byte Write is normally used, and when
writing continuous data of 2 Bytes or more, simultaneous write is possible by Page Write cycle. The maximum
number of Bytes is specified per device of each capacity. Up to 32 arbitrary Bytes can be written.
SDA
LINE
S
W
T
R
A
I
R
SLAVE T
1st WORD
T
ADDRESS E
ADDRESS
2nd WORD
ADDRESS
1 0 1 0 A2 A1 A0
WAWAWA WAWA
15 14 13 12 11
WA _D7
0
RA
A
A
/C
*1
C
C
WK
K
K
Figure 36. Byte Write Cycle
DATA
S
T
O
P
*1 WA12 to WA15 become don't care.
D0
A
C
K
SDA
LINE
S
W
T
R
A
I
R
SLAVE
T
T
ADDRESS
E
1st WORD
ADDRESS(n)
1 0 1 0 A2 A1 A0
WAWA WAWA WA
15 14 13 12 11
00
RA
/C
*1
WK
2nd WORD
ADDRESS(n)
DATA(n)
WA
D7
D0
0
A
A
A
C
C
C
K
K
K
Figure 37. Page Write Cycle
S
T
O
DATA(n+31)
P
D0
A
C
K
*1 WA12 to WA15 become don't care.
(2) During internal write execution, all input commands are ignored, therefore ACK is not returned.
(3) Data is written to the address designated by word address (n-th address)
(4) By issuing stop bit after 8bit data input, internal write to memory cell starts.
(5) When internal write is started, command is not accepted for tWR (5ms at maximum).
(6) Using page write cycle, writing in bulk is done as follows: When data of more than 32 Bytes is sent, the bytes in
excess overwrite the data already sent first.
(Refer to "Internal Address Increment")
(7) As for page write cycle of BR24G32-3A, where 2 or more bytes of data is intended to be written, after the 7
significant bits of word address are designated arbitrarily, only the value of 5 least significant bits in the address
is incremented internally, so that data up to 32 bytes of memory only can be written.
www.rohm.com
©2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
15/37
TSZ02201-0R2R0G100050-1-2
31.Aug.2016 Rev.008