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BR93H46RF-2LB Datasheet(HTML) 19 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) 19 Page - Rohm

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Datasheet
Datasheet
19/25
www.rohm.com
TSZ22111・15・001
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ02201-0R1R0G100250-1-2
BR93H46RF-2LB
27.Feb.2014 Rev.002
4) When to directly connect DI and DO
This IC has independent input terminal DI and output terminal DO, wherein signals are handled separately on timing chart.
But, by inserting a resistance R between these DI and DO terminals, it is possible to carry out control by only 1 control line.
○Data collision of microcontroller DI/O output and DO output and feedback of DO output to DI input.
Drive from the microcontroller DI/O output to DI input on I/O timing, and signal output from DO output occur at the same
time in the following points.
4-1) 1 Clock cycle to take in A0 address data at read command
Dummy bit “0” is output to DO terminal.
→When address data A0 = “1” input, through current route occurs.
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.
Microcontroller
DI/O PORT
DI
EEPROM
DO
R
Figure 45. DI, DO Control Line Common Connection
EEPROM CS input
EEPROM SK input
EEPROM DI input
EEPROM DO output
Microcontroller DI/O port
A1
High-Z
Collision of DI input and DO output
“H”
A0
0
D15 D14 D13
A1
A0
High-Z
Microcontroller output
Microcontroller input
Figure 46. Collision timing at read data output at DI, DO direct connection
EEPROM CS input
EEPROM SK input
EEPROM DI input
EEPROM DO output
Microcontroller DI/O port
Write command
Microcontroller output
BUSY
BUSY
READY
READY
READY
Collision of DI input and DO output
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
High-Z
Write command
Write command
Write command
Write command
Microcontroller input
Microcontroller output
Figure 47. Collision timing at DI, DO Direct Connection


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