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BR93H46RF-2LB Datasheet(HTML) 20 Page - Rohm

Part No. BR93H46RF-2LB
Description  Serial EEPROM Series Industrial EEPROM 125℃ Operation Microwire BUS EEPROM (3-wire)
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BR93H46RF-2LB Datasheet(HTML) 20 Page - Rohm

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Datasheet
Datasheet
20/25
www.rohm.com
TSZ22111・15・001
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ02201-0R1R0G100250-1-2
BR93H46RF-2LB
27.Feb.2014 Rev.002
○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.
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]
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
・V
IHE
・V
OLE
・V
OHM
・I
OHM
Microcontroller
DI/O PORT
DI
EEPROM
DO
R
“L” output
IOHM
VOLM
VOHE
“H” output
Conditions
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
: EEPROM VIL specifications
: EEPROM VOH specifications
:
Microcontroller
VOL
specifications
・V
ILE
・V
OHE
・V
OLM
・I
OLM
Conditions


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