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参数资料
| 型号： | BU9889GUL-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 19/26页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 8KBIT 2WIRE VCSP50L1 |
| 标准包装： | 3,000 |
| 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： | 6-UFBGA，CSPBGA |
| 供应商设备封装： | VCSP50L1 |
| 包装： | 带卷 (TR) |
BU9889GUL-W (8Kbit)
Datasheet
● Cautions on microcontroller connection
Rs
In I 2 C BUS, it is recommended that SDA port is of open drain input/output. However, when to use CMOS input / output of
tri state to SDA port, insert a series resistance Rs between the pull up resistance Rpu and the SDA terminal of EEPROM.
This is controls over current that occurs when PMOS of the microcontroller and NMOS of EEPROM are turned ON
simultaneously. Rs also plays the role of protection of SDA terminal against surge. Therefore, even when SDA port is
open drain input/output, Rs can be used.
ACK
SCL
R PU
R S
SDA
'H' output of microcontroller
'L' output of EEPROM
Microcontroller
EEPROM
Over current flows to SDA line by 'H' output of microcontroller
and 'L' output of EEPROM.
Figure 42. I/O circuit diagram
Figure 43. Input/output collision timing
○ Maximum value of Rs
The maximum value of Rs is determined by following relations.
(1)SDA rise time to be determined by the capacity (CBUS) of bus line of Rpu and SDA shoulder be t R or below.
And AC timing should be satisfied even when SDA rise time is late.
(2)The bus electric potential A to be determined by Rpu and Rs the moment when EEPROM outputs 'L' to SDA bus
should sufficiently secure the input 'L' level (V IL ) of microcontroller including recommended noise margin 0.1Vcc.
V CC
R PU
A
(V CC － V OL )×R S
R PU +R S
+ V OL +0.1V CC ≦ V IL
R S
I OL
V OL
∴ R S ≦
V IL － V OL － 0.1V CC
1.1V CC － V IL
×
R PU
Bus line
capacity CBUS
Example ） When V CC =3V, V IL =0.3V CC, V OL =0.4V, R PU =20k Ω ,
V IL
Microcontroller
EEPROM
from(2),
R S ≦
0.3×3 － 0.4 － 0.1×3
1.1×3 － 0.3×3
×
20×10
3
Figure 44. I/O circuit diagram
≦ 1.67 ［ k Ω］
○ Maximum value of Rs
The minimum value of Rs is determined by over current at bus collision. When over current flows, noises in power source
line, and instantaneous power failure of power source may occur. When allowable over current is defined as I, the
following relation must be satisfied. Determine the allowable current in consideration of impedance of power source line
in set and so forth. Set the over current to EEPROM 10mA or below.
R PU
'L' output
V CC
R S
≦
I
R S
∴ R S ≧
V CC
I
'H' output
Over current Ⅰ
Example ） When V CC =3V, I=10mA
Microcontroller
EEPROM
R S
≧
3
10×10
-3
≧ 300 ［Ω］
Figure 45. I/O circuit diagram
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
19/23
TSZ02201-0R2R0G100490-1-2
05.SEP.2012 Rev.001
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| BU9890GUL-W | 制造商:ROHM 制造商全称:Rohm 功能描述:Silicon Monolithic Integrated Circuit |
| BU9890GUL-WE2 | 功能描述:电可擦除可编程只读存储器 电可擦除可编程只读存储器 Serial-2Wire 32Kb RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
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