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参数资料
| 型号： | BU9891GUL-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 15/25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)
3) Equivalent circuit
Output circuit
Input citcuit
RESET int.
Datasheet
OEint.
Figure 38. Output circuit (DO)
DO
CS
Figure 39. Input circuit (CS)
CSint.
Input circuit
CS int.
Input circuit
CS int.
DI
Figure 40. Input circuit (DI)
SK
Figure 41. Input circuit (SK)
4) I/O peripheral circuit
4-1) Pull down CS.
By making CS=“L” at power ON/OFF, mistake in operation and mistake write are prevented.
○ Pull down resistance Rpd of CS pin
To prevent mistake in operation and mistake write at power ON/OFF, CS pull down resistance is necessary. Select an
appropriate value to this resistance value from microcontroller VOH, IOH, and VIL characteristics of this IC.
Rpd ≧
VOHM
IOHM
???①
Microcontroller
EEPROM
VOHM ≧
VIHE
???②
VOHM
VIHE
Example) When V CC =5V, VIHE=2V, VOHM=2.4V, IOHM=2mA,
from the equation ① ,
“H” output
IOHM
Rpd
“L” input
Rpd ≧
2.4
2 × 10
-3
∴
Rpd ≧
1.2 [k Ω ]
Figure 42. CS pull down resistance
With the value of Rpd to satisfy the above equation, VOHM becomes
2.4V or higher, and VIHE (=2.0V), the equation ② is also satisfied.
? VIHE
: EEPROM VIH specifications
? VOHM : Microcontroller VOH specifications
? IOHM
: Microcontroller IOH specifications
4-2) DO is available in both pull up and pull down.
Do output become “High-Z” in other READY / BUSY output timing than after data output at read command and write
command. When malfunction occurs at “High-Z” input of the microcontroller port connected to DO, it is necessary to
pull down and pull up DO. When there is no influence upon the microcontroller actions, DO may be OPEN.
If DO is OPEN, and at timing to output status READY, at timing of CS=“H”, SK=“H”, DI=“H”, EEPROM recognizes
this as a start bit, resets READY output, and DO=”High-Z”, therefore, READY signal cannot be detected. To avoid
such output, pull up DO pin for improvement.
CS
SK
Enlarged
CS “H”
SK
DI
D0
DI
DO
High-Z
READY
DO BUSY
High-Z
CS=SK=DI=”H”
When DO=OPEN
BUSY
Improvement by DO pull up
DO
BUSY
READY
CS=SK=DI=”H”
When DO=pull up
Figure 43. READY output timing at DO=OPEN
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
15/22
TSZ02201-0R2R0G100440-1-2
3.SEP.2012 Rev.001
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