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参数资料
| 型号： | BU9891GUL-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 18/25页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 4KBIT VCSP T/R |
| 标准包装： | 3,000 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 4K (256 x 16) |
| 速度： | 2MHz |
| 接口： | Microwire 3 线串行 |
| 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) |
BU9891GUL-W (4Kbit)
Datasheet
○ Selection of resistance value R
The resistance R becomes through current limit resistance at data collision. When through current flows, noises of
power source line and instantaneous stop of power source may occur. When allowable through current is defined as I,
the following relation should be satisfied. Determine allowable current amount in consideration of impedance and so
forth of power source line in set. And insert resistance R, and set the value R to satisfy EEPROM input level VIH/VIL
even under influence of voltage decline owing to leak current and so forth. Insertion of R will not cause any influence
upon basic operations.
(1) Address data A0 = “1” input, dummy bit “0” output timing
(When microcontroller DI/O output is “H”, EEPROM DO outputs “L”, and “H” is input to DI)
? Make the through current to EEPROM 10mA or below.
? See to it that the level VIH of EEPROM should satisfy the following.
Microcontroller
EEPROM
Conditions
VOHM ≦ VIHE
DI/O PORT
DI
VOHM ≦ IOHM × R + VOLE
“H” output
VOHM
At this moment, if VOLE=0V,
IOHM
R
VOHM ≦ IOHM × R
DO
VOLE
∴
R ≧
VOHM
IOHM
???⑦
“L” output
Figure 51. Circuit at DI, DO direct connection
? VIHE
? VOLE
? VOHM
? IOHM
: EEPROM VIH specifications
: EEPROM VOL specifications
: Microcontroller VOH specifications
: Microcontroller IOH specifications
(Microcontroller DI/O “H” output, EEPROM “L” output)
(2) DO status READY output timing
(When the microcontroller DI/O is “L”, EEPROM DO output “H”, and “L” is input to DI)
? Set the EEPROM input level VIL so as to satisfy the following.
Conditions
Microcontroller
EEPROM
VOLM ≧ VILE
“L” output
DI/O PORT
VOLM
DI
VOLM ≧ VOHE – IOLM × R
As this moment, VOHE=Vcc
VOLM ≧ Vcc – IOLM × R
IOHM
R
DO
∴
R ≧
Vcc – VOLM
IOLM
???⑧
VOHE
“H” output
? VILE
? VOHE
? VOLM
? IOLM
: EEPROM VIL specifications
: EEPROM VOH specifications
: Microcontroller VOL specifications
: Microcontroller IOL specifications
Figure 52. Circuit at DI, DO direct connection
(Microcontroller DI/O “L” output, EEPROM “H” output)
Example) When Vcc=5V, VOHM=5V, IOHM=0.4mA, VOLM=5V, IOLM=0.4mA,
From the equation ⑦ ,
From the equation ⑧ ,
0.4 × 10
2.1 × 10
R ≧
R ≧
VOHM
IOHM
5
-3
R ≧
R ≧
Vcc – VOLM
IOLM
5 – 0.4
-3
∴
R ≧
12.5 [k ? ]
???⑨
∴
R ≧
2.2 [k ? ]
???⑩
Therefore, from the equations ⑨ and ⑩ ,
∴
R ≧
12.5 [k ? ]
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
18/22
TSZ02201-0R2R0G100440-1-2
3.SEP.2012 Rev.001
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