参数资料
型号: BR93L56FVT-WE2
厂商: Rohm Semiconductor
文件页数: 34/41页
文件大小: 0K
描述: IC EEPROM 2KBIT 2MHZ 8TSSOP
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-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 8-TSSOP-B
包装: 标准包装
产品目录页面: 1380 (CN2011-ZH PDF)
其它名称: BR93L56FVT-WE2DKR
BR93L -W Series, 93A □□ -WM Series, BR93H □□ -WC Series
Technical Note
4-2) Timing of CS = “H” after write command. DO terminal in READY / BUSY function output.
When the next start bit input is recognized, “HIGH-Z” gets in.
→ Especially, at command input after write, when CS input is started with microcontroller DI/O output “L”,
READY output “H” is output from DO terminal, and through current route occurs.
Feedback input at timing of these 4-1) and 4-2) does not cause disorder in basic operations, if resistance R is inserted.
~ ~
EEPROM CS input
EEPROM SK input
EEPROM DI input
Write command
Write command
Write command
~ ~
~ ~
~ ~
~ ~
~ ~
BUSY
EEPROM DO output
Write command
~ ~
READY
~ ~
READY
High-Z
Collision of DI input and DO output
Microcontroller DI/O port
Write command
BUSY
~ ~
READY
~ ~
Microcontroller output
Microcontroller input
Microcontroller output
Fig.48 Collision timing at DI, DO direct connection
○ 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.
4-3) 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 input 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
? VIHE
: EEPROM VIH specifications
“L” output
? VOLE
? VOHM
? IOHM
: EEPROM VOL specifications
: Microcontroller VOH specifications
: Microcontroller IOH specifications
Fig.49
Circuit at DI, DO direct connection (Microcontroller DI/O “H” output, EEPROM “L” output)
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
34/40
2011.09 - Rev.G
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