参数资料
型号: BR93L56RF-WE2
厂商: Rohm Semiconductor
文件页数: 32/41页
文件大小: 0K
描述: IC EEPROM 2KBIT 2MHZ 8SOP
标准包装: 1
格式 - 存储器: EEPROMs - 串行
存储器类型: EEPROM
存储容量: 2K (128 x 16)
速度: 2MHz
接口: Microwire 3 线串行
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.173",4.40mm 宽)
供应商设备封装: 8-SOP
包装: 标准包装
产品目录页面: 1380 (CN2011-ZH PDF)
其它名称: BR93L56RF-WE2DKR
BR93L -W Series, 93A □□ -WM Series, BR93H □□ -WC Series
Technical Note
3-2) 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 thisas 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
Fig.42 READY output timing at DO=OPEN
○ Pull up resistance Rpu and pull down resistance Rpd of DO pin
As for pull up and pull down resistance value, select an appropriate value to this resistance value from microcontroller
VIH, VIL, and VOH, IOH, VOL, IOL characteristics of this IC.
Rpu ≧
V cc - VOLE
IOLE
???③
Microcontroller
EEPROM
VOLE ≦
VILM
???④
2.1 × 10
VILM
“L” input
Rpu
IOLE
VOLE
“L” output
Example) When V CC =5V , VOLE=0.4V, IOLE=2.1mA, VILM=0.8V,
from the equation ③ ,
5 - 0.4
Rpu ≧
-3
Rpu ≧
2.2 [k Ω ]
? VOLE
? IOLE
? VILM
With the value of Rpu to satisfy the above equation, VOLE becomes 0.4V or
below, and with VILM(=0.8V), the equation ④ is also satisfied.
? VOLE : EEPROM VOL specifications
Fig.43 DO pull up resistance
? IOLE
? VILM
: EEPROM IOL specifications
: Microcontroller VIL specifications
Rpd ≧
VOHE
IOHE
???⑤
Microcontroller
EEPROM
VOHE ≧
VIHM
???⑥
VIHM
VOHE
Example) When V CC =5V , VOHE=Vcc - 0.2V, IOHE=0.1mA,
VIHM=Vcc × 0.7V from the equation ⑤
0.1 × 10
“H” input
Rpd
IOHE
“H” output
Rpd ≧
5 - 0.2
-3
Rpd ≧
48 [k Ω ]
With the value of Rpd to satisfy the above equation, VOHE becomes 2.4V or
below, and with VIHM (=3.5V), the equation ⑥ is also satisfied.
Fig.44 DO pull down resistance
? VOHE : EEPROM VOH specifications
? IOHE
? VIHM
: EEPROM IOH specifications
: Microcontroller VIH specifications
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
32/40
2011.09 - Rev.G
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