参数资料
型号: BR93L66RFVM-WE2
厂商: Rohm Semiconductor
文件页数: 19/41页
文件大小: 0K
描述: IC EEPROM 4KBIT 2MHZ 8MSOP
标准包装: 2,500
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: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-VSSOP,8-MSOP(0.110",2.80mm 宽)
供应商设备封装: 8-MSOP
包装: 带卷 (TR)
BR93L -W Series, 93A □□ -WM Series, BR93H □□ -WC Series
Technical Note
○ 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.
Conditions
Microcontroller
DI/O PORT
DI
EEPROM
VOHM ≦ VIHE
VOHM ≦ IOHM × R + VOLE
At this moment, if VOLE=0V,
“H” output
VOHM
VOHM ≦ IOHM × R
IOHM
R
DO
R ≧
VOHM
IOHM
???⑦
VOLE
“L” output
? VIHE
? VOLE
? VOHM
? IOHM
: EEPROM VIH specifications
: EEPROM VOL specifications
: Microcontroller VOH specifications
: Microcontroller IOH specifications
Fig.84
Circuit at DI, DO direct connection (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
IOHM
R
DI
VOLM ≧ VOHE – IOLM × R
As this moment, VOHE=Vcc
VOLM ≧ Vcc – IOLM × R
DO
VOHE
“H” output
Vcc – VOLM
IOLM
???⑧
? VILE
? VOHE
? VOLM
? IOLM
Example) When Vcc=5V, VOHM=5V, IOHM=0.4mA, VOLM=5V, IOLM=0.4mA,
: EEPROM VIL specifications
: EEPROM VOH specifications
: Microcontroller VOL specifications
: Microcontroller IOL specifications
From the equation ⑦ ,
From the equation ⑧ ,
0.4 × 10
2.1 × 10
R ≧
R ≧
VOHM
IOHM
5
-3
R ≧
R ≧
V cc – VOL M
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 ? ]
Fig.85 Circuit at DI, DO direct connection (Microcontroller DI/O “L” output, EEPROM “H” output)
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
19/40
2011.09 - Rev.G
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