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| 型号： | BR34L02FV-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 15/18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
● Power Supply Notes
V CC increases through the low voltage region where the internal circuit of IC and the microcontroller are unstable. In order
to prevent malfunction, the IC has P.O.R and LV CC functionality. During power up, ensure that the following conditions are
met to guaranty P.O.R. and LV CC operability.
1. "SDA='H'" and "SCL='L' or 'H'".
2. Follow the recommended conditions of tR, tOFF, Vbot so that P.O.R. will be activated during power up.
tR
V CC
Recommended conditions of tR, tOFF, Vbot
tR
tOFF
Vbot
tOFF
Vbot
Below 10ms
Above 10ms
Below 0.3V
0
Fig.52 V CC rising wavefrom
Below 100ms
Above 10ms
Below 0.2V
3. Prevent SDA and SCL from being "Hi-Z".
In case that condition 1. and/or 2. cannot be met, take following actions.
A) If unable to keep Condition 1 (SDA is "Low" during power up)
→ Make sure that SDA and SCL are "High" as in the figure below.
V CC
tLOW
SCL
SDA
After Vcc becomes stable
After Vcc becomes stable
tDH
tSU:DAT
tSU:DAT
Fig.53 SCL="H" and SDA="L"
Fig.54 SCL="L" and SDA="L"
B) If unable to keep Condition 2
→ After the power stabilizes, execute software reset. (See page 9,10)
C) If unable to keep either Condition 1 or 2
→ Follow Instruction A first, then B
● LV CC Circuit
The LV CC circuit prevents Write operation at low voltage and prevents inadvertent writing. A voltage below the LV CC voltage
(1.2V typ.) prohibits Write operation.
● V CC Noise
○ Bypass Capacitor
Noise and surges on the power line may cause abnormal function. It is recommended that bypass capacitors (0.1μF) be
attached between V CC and GND externally.
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
15/17
2009.04 - Rev.A
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