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

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.

4-4) DO Status READY Output Timing

(When the microcontroller DI/O is “L”, EEPROM DO outputs “H”, and “L” is input to DI)

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)

∴

R ≧

・・・⑦

Microcontroller

DI/O PORT

DI

EEPROM

DO

R

“L” output

IOHM

VOLM

VOHE

“H” output

Condition

∴

R ≧

・・・⑧

Figure 49 Circuit at DI, DO Direct Connection (Microcontroller DI/O “L” output, EEPROM “H” output)

From the equation ⑦,

From the equation ⑧,

R ≧

R ≧

5

0.4×10

-3

∴

R ≧

12.5 [kΩ]

・・・⑨

R ≧

R ≧

5 – 0.4

2.1×10

-3

∴

R ≧

2.2 [kΩ]

・・・⑩

Therefore, from the equations ⑨ and ⑩,

∴

R ≧

12.5 [kΩ]

Condition