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BU9888FV-W датащи(PDF) 10 Page - Rohm

номер детали BU9888FV-W
подробное описание детали  High Reliability Serial EEPROMs
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
Logo ROHM - Rohm

BU9888FV-W датащи(HTML) 10 Page - Rohm

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Technical Note
10/16
BU9888FV-W
www.rohm.com
2011.01 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
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.
Fig.38 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.
CS
SK
DI
DO
D0
BUSY
READY
High-Z
Enlarged
CS
SK
DI
DO BUSY
High-Z
Improvement by DO pull up
BUSY
READY
CS=SK=DI=”H”
When DO=OPEN
CS=SK=DI=”H”
When DO=pull up
DO
“H”
Microcontroller
VILM
“L” input
IOLE
VOLE
“L” output
EEPROM
Rpu
Fig.39 DO pull up resistance
Rpu ≧
・・・③
Rpu ≧ 2.2 [kΩ]
VOLE ≦ VILM
・・・④
Rpu ≧
Example) When VCC =5V, VOLE=0.4V, IOLE=2.1mA, VILM=0.8V,
from the equation ③,
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.
: EEPROM VOL specifications
: EEPROM IOL specifications
: Microcontroller VIL specifications
VOLE
IOLE
VILM
Rpd ≧
・・・⑤
Rpd ≧ 48 [kΩ]
VOHE ≧ VIHM
・・・⑥
Rpd ≧
Example) When VCC =5V, VOHE=Vcc-0.2V, IOHE=0.1mA,
VIHM=Vcc×0.7V from the equation ⑤,
VOHE
IOHE
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.
: EEPROM VOH specifications
: EEPROM IOH specifications
: Microcontroller VIH specifications
VOHE
IOHE
VIHM
5-0.2
0.1×10
-3
Microcontroller
VIHM
“H” input
IOHE
VOHE
“H” output
EEPROM
Rpd
Fig.40 DO pull down resistance


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