- 您现在的位置：买卖IC网 > Sheet目录316 > BU9847GUL-WE2 (Rohm Semiconductor)IC EEPROM 4KBIT 2WIRE VCSP50L1
BU9847GUL-W (4Kbit)
Datasheet
● Notes on power ON
At power on, in IC internal circuit and set, Vcc rises through unstable low voltage area, and IC inside is not completely reset,
and malfunction may occur. To prevent this, function of POR circuit and LVCC circuit are equipped. To assure the action,
observe the following conditions at power on.
1. Set SDA= “H” and SCL = “L” or “H”.
2. Start power source so as to satisfy the recommended conditions of tR, tOFF, and Vbot for operating POR circuit.
tR
V CC
Recommended conditions of tR, tOFF, Vbot
tR
tOFF
Vbot
0
tOFF
Vbot
10ms or below
100ms or below
10ms or higher
10ms or higher
0.3V or below
0.2V or below
Figure 52. Rise waveform diagram
3. Set SDA and SCL so as not to become “Hi-Z”.
When the above conditions 1 and 2 cannot be observed, take the following countermeasures.
a) In the case when the above condition 1 cannot be observed. When SDA becomes “L” at power on.
→
Control SCL and SDA as shown below, to make SCL and, “H” and “H”.
V CC
SCL
SDA
After Vcc becomes stable
tLOW
After Vcc becomes stable
tDH
tSU:DAT
tSU:DAT
Figure 53. When SCL =”H” and SDA = “L”
Figure 54. When SCL = “H” and SDA = “L”
b) In the case when the above condition 2 cannot be observed.
→ After power source becomes stable, execute software reset (Page 16).
c) In the case when the above conditions 1 and 2 cannot be observed.
→ Carry out a), and then carry out b).
● Low voltage malfunction prevention function
LVCC circuit prevents data rewrite action at low power, and prevents wrong write. At LVCC voltage (Typ. = 1.2V) or below, it
prevent data rewrite.
● Vcc noise countermeasures
○ Bypass capacitor
When noise or surge gets in the power source line, malfunction may occur, therefore, for removing these, it is
recommended to attach a by pass capacitor (0.1 μ F) between IC Vcc and GND. At that moment , attach it as close to IC
as possible. And, it is also recommended to attach a bypass capacitor between board Vcc and GND.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
21/24
TSZ02201-0R2R0G100480-1-2
4.SEP.2012 Rev.001
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
BU9880GUL-WE2
IC EEPROM 64KBIT 2WIRE VCSP50L1
BU9882FV-WE2
IC EEPROM 2KBIT 400KHZ 14SSOP
BU9883FV-WE2
IC EEPROM 6KBIT 400KHZ SSOP16
BU9889GUL-WE2
IC EEPROM 8KBIT 2WIRE VCSP50L1
BU9891GUL-WE2
IC EEPROM 4KBIT VCSP T/R
BU9897GUL-WE2
IC EEPROM SERIAL VCSP50L2
BU99901GUZ-WE2
IC EEPROM 32KBIT 2WIRE VCSP
BUK218-50DY,118
TOPFET DUAL SWITCH D2PAK
相关代理商/技术参数
BU98570CH-3BW
制造商:ROHM 制造商全称:Rohm 功能描述:65,536 Colors 98RGB x 70 STN LCD control driver
BU98582CH-3BW
制造商:ROHM 制造商全称:Rohm 功能描述:65,536 Colors 104RGB x 82 STN LCD control driver
BU98664CH-3BW
制造商:ROHM 制造商全称:Rohm 功能描述:65,536 Colors 132RGB x 164 STN LCD control driver
BU9873F-GTE2
功能描述:Real Time Clock (RTC) IC Clock/Calendar I2C, 2-Wire Serial 8-SOIC (0.173", 4.40mm Width) 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 类型:时钟/日历 特性:警报器，闰年 存储容量:- 时间格式:HH：MM：SS（12/24 小时） 日期格式:YY-MM-DD-dd 接口:I2C，2 线串口 电压 - 电源:1.8 V ~ 5.5 V 电压 - 电源，电池:- 电流 - 计时（最大）:1μA ~ 1.35μA @ 3V ~ 5.5V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.173"，4.40mm 宽） 供应商器件封装:8-SOP 标准包装:1
BU9873FJ-GTE2
功能描述:Real Time Clock (RTC) IC Clock/Calendar I2C, 2-Wire Serial 8-SOIC (0.154", 3.90mm Width) 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 类型:时钟/日历 特性:警报器，闰年 存储容量:- 时间格式:HH：MM：SS（12/24 小时） 日期格式:YY-MM-DD-dd 接口:I2C，2 线串口 电压 - 电源:1.8 V ~ 5.5 V 电压 - 电源，电池:- 电流 - 计时（最大）:1μA ~ 1.35μA @ 3V ~ 5.5V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:* 标准包装:1
BU9873FVM-GTTR
功能描述:Real Time Clock (RTC) IC Clock/Calendar I2C, 2-Wire Serial 8-VSSOP, 8-MSOP (0.110", 2.80mm Width) 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 类型:时钟/日历 特性:警报器，闰年 存储容量:- 时间格式:HH：MM：SS（12/24 小时） 日期格式:YY-MM-DD-dd 接口:I2C，2 线串口 电压 - 电源:1.8 V ~ 5.5 V 电压 - 电源，电池:- 电流 - 计时（最大）:1μA ~ 1.35μA @ 3V ~ 5.5V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-VSSOP，8-MSOP（0.110"，2.80mm 宽） 供应商器件封装:8-MSOP 标准包装:1
BU9873FVT-GE2
功能描述:Real Time Clock (RTC) IC Clock/Calendar I2C, 2-Wire Serial 8-TSSOP (0.173", 4.40mm Width) 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 类型:时钟/日历 特性:警报器，闰年 存储容量:- 时间格式:HH：MM：SS（12/24 小时） 日期格式:YY-MM-DD-dd 接口:I2C，2 线串口 电压 - 电源:1.8 V ~ 5.5 V 电压 - 电源，电池:- 电流 - 计时（最大）:1μA ~ 1.35μA @ 3V ~ 5.5V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:8-TSSOP-B 标准包装:1
BU9873NUX-TTR
功能描述:Real Time Clock (RTC) IC Clock/Calendar I2C, 2-Wire Serial 8-UFDFN Exposed Pad 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 类型:时钟/日历 特性:警报器，闰年 存储容量:- 时间格式:HH：MM：SS（12/24 小时） 日期格式:YY-MM-DD-dd 接口:I2C，2 线串口 电压 - 电源:1.8 V ~ 5.5 V 电压 - 电源，电池:- 电流 - 计时（最大）:1μA ~ 1.35μA @ 3V ~ 5.5V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-UFDFN 裸露焊盘 供应商器件封装:VSON008X2030 标准包装:1