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BR93H86RFVM-2C Datasheet(PDF) 20 Page - Rohm

Part No. BR93H86RFVM-2C
Description  Serial EEPROM Series Automotive EEPROM 125℃ Operation Microwire BUS EEPROM (3-wire)
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BR93H86RFVM-2C Datasheet(HTML) 20 Page - Rohm

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BR93H86-2C
20/29
Datasheet
Datasheet
www.rohm.com
19.DEC.2012 Rev.002
TSZ02201-0R1R0G100050-1-2
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○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.
4-4) DO Status READY Output Timing
(When the microcontroller DI/O is “L”, EEPROM DO outputs “H”, and “L” is input to DI)
・Set the EEPROM input level VIL so as to satisfy the following.
Microcontroller
DI/O PORT
DI
EEPROM
DO
R
“H” output
IOHM
VOHM
VOLE
“L” output
Figure 48 Circuit at DI, DO Direct Connection (Microcontroller DI/O “H” output, EEPROM “L” output)
VOHM ≦ VIHE
VOHM ≦ IOHM×R + VOLE
At this moment, if VOLE=0V,
VOHM ≦ IOHM×R
R ≧
・・・⑦
VOHM
IOHM
: EEPROM VIH specifications
: EEPROM VOL specifications
: Microcontroller VOH specifications
: Microcontroller IOH specifications
・VIHE
・VOLE
・VOHM
・IOHM
Microcontroller
DI/O PORT
DI
EEPROM
DO
R
“L” output
IOHM
VOLM
VOHE
“H” output
Condition
VOLM ≧ VILE
VOLM ≧ VOHE – IOLM×R
As this moment, if VOHE=Vcc,
VOLM ≧ Vcc – IOLM×R
R ≧
・・・⑧
Vcc – VOLM
IOLM
Figure 49 Circuit at DI, DO Direct Connection (Microcontroller DI/O “L” output, EEPROM “H” output)
Example) When Vcc=5V, VOHM=5V, IOHM=0.4mA, VOLM=0.4V, IOLM=2.1mA,
From the equation ⑦,
From the equation ⑧,
R ≧
R ≧
VOHM
IOHM
5
0.4×10
-3
R ≧
12.5 [kΩ]
・・・⑨
R ≧
R ≧
Vcc – VOLM
IOLM
5 – 0.4
2.1×10
-3
R ≧
2.2 [kΩ]
・・・⑩
Therefore, from the equations ⑨ and ⑩,
R ≧
12.5 [kΩ]
: EEPROM VIL specifications
: EEPROM VOH specifications
: Microcontroller VOL specifications
: Microcontroller IOL specifications
・VILE
・VOHE
・VOLM
・IOLM
Condition


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