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参数资料
| 型号： | BR34L02FV-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 2KBIT 400KHZ 8SSOP |
| 标准包装： | 1 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 2K (256 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-LSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-SSOPB |
| 包装： | 标准包装 |
| 产品目录页面： | 1379 (CN2011-ZH PDF) |
| 其它名称： | BR34L02FV-WE2DKR |
BR34L02FV-W
Technical Note
● Software Reset
Execute software reset in the event that the device is in an unexpected state after power up and/or the command input
needs to be reset. Below are three types(Fig.39 –(a), (b), (c)) of software reset:
? During dummy clock, release the SDA BUS (tied to V CC by a pull-up resistor) .
? During this time the device may pull the SDA line Low for Acknowledge or the outputting of read data.
? If the Master sets the SDA line to High, it will conflict with the device output Low, which can cause current overload and
result in instantaneous power down, which may damage the device.
DUMMY CLOCK × 14
START × 2
SCL
1
2
13
14
COMMAND
SDA
Fig.39-(a) DUMMY CLOCK × 14 + START+START
COMMAND
START
DUMMY CLOCK × 9
START
SCL
1
2
8
9
COMMAND
SDA
Fig.39-(b) START + DUMMY CLOCK × 9 + START
START × 9
COMMAND
SCL
1
2
3
7
8
9
COMMAND
SDA
COMMAND
Fig.39-(c) START × 9
* COMMAND starts with start condition.
● Acknowledge polling
Since the IC ignores all input commands during the internal write cycle, no ACK signal will be returned.
When the Master sends the next command after the Write command, if the device returns an ACK signal it means that the
program is completed. No ACK signal indicates that the device is still busy.
Using Acknowledge polling decreases the waiting time by tWR=5ms.
When operating Write or Current Read after Write, first transmit the Slave address (R/W is"High" or "Low"). After the device
returns the ACK signal continue word address input or data output.
During the internal write cycle,
THE FIRST WRITE COMMAND
no ACK will be returned.
(ACK=High)
S
T
A
R
T
WRITE COMMAND
S
Ｔ
O
P
S
T
A
R
T
SLAVE
ADDRESS
A
C
K
H
S
T
A
R
T
SLAVE
ADDRESS
A
C
K
H
???
tWR
THE SECOND WRITE COMMAND
???
S
T
A
R
T
SLAVE
ADDRESS
A
C
K
H
S
T
A
R
T
SLAVE
ADDRESS
A
C
K
L
WORD
ADDRESS
A
C
K
L
DATA
A
C
K
L
S
Ｔ
O
P
tWR
After the internal write cycle
is completed, ACK will be returned
(ACK=Low). Then input next
Word Address and data.
Fig.40 Successive Write Operation By Acknowledge Polling
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
10/17
2009.04 - Rev.A
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