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BR24A Datasheet(PDF) 11 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) 11 Page - Rohm

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BR24A□□-WM series
Technical Note
11/17
www.rohm.com
2009.08 - Rev.C
© 2009 ROHM Co., Ltd. All rights reserved.
Software reset
Software reset is executed when to avoid malfunction after power on, and to reset during command input. Software reset
has several kinds, and 3 kinds of them are shown in the figure below. (Refer to Fig.47(a), Fig.47(b), and Fig.47(c).) In
dummy clock input area, release the SDA bus ('H' by pull up). In dummy clock area, ACK output and read data '0' (both 'L'
level) may be output from EEPROM, therefore, if 'H' is input forcibly, output may conflict and over current may flow, leading
to instantaneous power failure of system power source or influence upon devices.
Acknowledge polling
During internal write execution, all input commands are ignored, therefore ACK is not sent back. During internal automatic
write execution after write cycle input, next command (slave address) is sent, and if the first ACK signal sends back 'L', then
it means end of write action, while if it sends back 'H', it means now in writing. By use of acknowledge polling, next
command can be executed without waiting for tWR = 5ms.
When to write continuously, R/W = 0, when to carry out current read cycle after write, slave address R/W = 1 is sent, and if
ACK signal sends back 'L', then execute word address input and data output and so forth.
Fig.48 Case to continuously write by acknowledge polling
1
2
13
14
SCL
Dummy clock×14
Start×2
Fig.47-(a) The case of dummy clock +START+START+ command input
Start command from START input.
2
1
8
9
Dummy clock×9
Start
Fig.47-(b) The case of START +9 dummy clocks +START+ command input
Start
Normal command
Normal command
Normal command
Normal command
Start×9
SDA
1
2
3
8
9
7
Fig.47-(c) START×9+ command input
Normal command
Normal command
SCL
SDA
SCL
SDA
S
T
A
R
T
First write command
A
C
K
H
Slave
address
Slave
address
Write command
During internal write,
ACK = HIGH is sent back.
tWR
Second write command
S
T
A
R
T
S
T
A
R
T
S
T
O
P
S
T
O
P
A
C
K
H
A
C
K
H
A
C
K
L
A
C
K
L
Slave
address
Word
address
A
C
K
L
Slave
address
Data
After completion of internal write,
ACK=LOW is sent back, so input next
word address and data in succession.
tWR
S
T
A
R
T
S
T
A
R
T
S
T
O
P
A
C
K
H
A
C
K
L


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