参数资料
| 型号： | BR24T08F-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM I2C 8K 400KHZ 8-SOP |
| 标准包装： | 1 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 8K (1K x 8) |
| 速度： | 400kHz |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 标准包装 |
| 其它名称： | BR24T08F-WE2DKR |
BR24T □□□□ Series
Technical Note
● 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.48-(a), Fig.48-(b), Fig.48-(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.
Dummy clock×14
Start×2
SCL
1
2
13
14
Normal command
SDA
Normal command
Fig.48-(a) The case of dummy clock +START+START+ command input
Start
Dummy clock × 9
Start
SCL
1
2
8
9
Normal command
SDA
Normal command
Fig.48-(b) The case of START +9 dummy clocks +START+ command input
Start × 9
SCL
1
2
3
7
8
9
Normal command
SDA
SD
Normal command
Fig.48-(c) START×9+ command input
※ Start command from START input.
● 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.
First write command
During internal write,
ACK = HIGH is sent back.
S
T
A
R
T
Write command
S
T
O
P
S
T Slave
A
R address
T
A
C
K
H
S
T Slave
A
R address
T
A
C
K
H
…
tWR
Second write command
…
S
T Slave
A
R address
T
A
C
K
H
S
T Slave
A
R address
T
A
C
K
L
Word
address
A
C
K
L
Data
A
C
K
L
S
T
O
P
tWR
After completion of internal write,
ACK=LOW is sent back, so input
next word address and data in
succession.
Fig.49 Case to continuously write by acknowledge polling
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
12/21
2011.03 - Rev.A
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