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参数资料
| 型号： | BU9844GUL-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 18/29页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 16KBIT 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： | 16K (2K 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) |
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BU9844GUL-W (16Kbit)
Datasheet
I/O peripheral circuit
1. Pull up resistance of SDA terminal
SDA is NMOS open drain, so requires pull up resistance. As for this resistance value (R PU ), select an appropriate value to
this resistance value from microcontroller V IL , I L , and V OL -I OL characteristics of this IC. If R PU is large, action frequency is
limited. The smaller the R PU , the larger the consumption current at action.
2. Maximum value of R PU
The maximum value of R PU is determined by the following factors.
(1) SDA rise time to be determined by the capacity (CBUS) of bus line of R PU and SDA should 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 input leak total (I L ) of device connected to bus at output of “H” to
SDA bus and R PU should sufficiently secure the input “H” level (V IH ) of microcontroller and EEPROM including
recommended noise margin 0.2Vcc.
V CC - I L R PU - 0.2 V? CC ? ≥ V IH
∴ R PU
≤
0 . 8V CC - V IH
I L
Microcontroller
R PU
EEPROM
Ex.) When V CC =3V, I L =10 μ A, V IH =0.7 Vcc
from (2)
A
SDA terminal
∴ R PU
≤
0 . 8 × 3 - 0 . 7 × 3
10 × 10 - 6
IL
IL
Bus line
capacity CBUS
≤ 300
k ?
Figure 44. I/O circuit diagram
3. Minimum value of R PU
The minimum value of R PU is determined by the following factors.
(1) When IC outputs LOW, it should be satisfied that V OLMAX = 0.4V and I OLMAX = 3mA.
V CC - V OL
R PU
≤ I OL
∴ R PU ≥
V CC - V OL
I OL
(2) V OLMAX = 0.4V should secure the input “L” level (V IL ) of microcontroller and EEPROM including recommended noise
margin 0.1V CC .
V OLMAX ≤ V IL ‐ 0.1V CC
Ex.) When V CC = 3V, V OL = 0.4V, I OL = 3mA, microcontroller, EEPROM V IL = 0.3V CC
From (1),
∴ R PU ≥
3 - 0 . 4
3 × 10 -3
≥ 867
[ ? ]
And
V OL = 0 . 4 [ V ]
V IL = 0 . 3 × 3
?????????? = 0 . 9
[ V ]
Therefore, the condition (2) is satisfied.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
18/26
TSZ02201-0R2R0G100470-1-2
17.Sep.2013 Rev.002
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BU9847GUL-W | 制造商:ROHM 制造商全称:Rohm 功能描述:WL-CSP EEPROM family I2C BUS |
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| BU9847GUL-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 4Kb 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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| 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 |
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