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BR93H46RF-2LB Datasheet(HTML) 17 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) 17 Page - Rohm

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Datasheet
Datasheet
17/25
www.rohm.com
TSZ22111・15・001
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ02201-0R1R0G100250-1-2
BR93H46RF-2LB
27.Feb.2014 Rev.002
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”
3)
I/O Peripheral Circuit
3-1) Pull Down CS
By making CS=“L” at power ON/OFF, mistake in operation and mistake write are prevented.
○Pull Down Resistance Rpd of CS pin
To prevent mistake in operation and mistake write at power ON/OFF, a CS pull-down resistor is necessary.
Select an appropriate resistance value from microcontroller’s VOH, IOH and this IC’s VIH characteristics.
3-2) DO is available for both pull up and pull down.
DO output is “High-Z” except during READY / BUSY output timing in WRITE command and, after data output at READ
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 left OPEN. If DO is OPEN
during a transition of output from BUSY to READY status, and at an instance where CS=“H”, SK=“H”, DI=“H”, EEPROM
recognizes this as a start bit, resets READY output, and sets DO=”High-Z”. Therefore, READY signal cannot be detected.
To avoid such output, pull up DO pin for improvement.
Figure 40. CS Pull-down Resistance
Microcontroller
VOHM
“H” output
IOHM
Rpd
VIHE
“L” input
EEPROM
Rpd
・・・①
VOHM
IOHM
VOHM
VIHE
・・・②
4.0
2×10-3
Rpd
2.0 [kΩ]
Rpd
Example) When VCC =5V, VIHE=3.5V, VOHM=4.0V, IOHM=2mA,
from the equation ①,
With the value of Rpd satisfying the equation above, VOHM becomes 4.0V or
higher, and with VIHE (=3.5V), equation ② is also satisfied.
: EEPROM VIH specifications
: Microcontroller VOH specifications
: Microcontroller IOH specifications
・V
IHE
・V
OHM
・I
OHM
Figure 41. READY Output Timing at DO=OPEN


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