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BU9829GUL-W Fiches technique(PDF) 11 Page - Rohm

No de pièce BU9829GUL-W
Description  WL-CSP EEPROM family SPI BUS
Download  17 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BU9829GUL-W Fiches technique(HTML) 11 Page - Rohm

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Technical Note
11/16
BU9829GUL-W
www.rohm.com
2010.09 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
EEPROM part
1. Hardware Connection of EEPROM
EEPROM may have malfunction owing to noise signal for input pin, and movement in the low voltage region at power
ON/OFF. These malfunctions may occur, especially at min voltage limit of EEPROM or below.
To avoid this, please note about hardware connection showed as follows.
1.1 Input Terminals
Input equivalent circuits of CSB, SCK and SI are showed Fig.47, 48.
Input terminal is connected between CMOS schmitt trigger input circuit and input protection circuit.
These pin are not pull up or pull down, therefore please don’t input Hi-Z in use. And please make CSB “HIGH” in the
low voltage region at power ON/OFF. If CSB is "LOW" at power ON/OFF, malfunction may occur. To make other input
terminals pull up or pull down is recommendable.
1.2 Output Terminals
Output equivalent circuit of so is showed Fig.49. This output terminal is 3 states buffer.
The data is output from so at output timing by READ command, so is Hi-z except this timing. If EEPROM malfunction
occur by Hi-z input of the microcontroller port connected with so, please make so pull up or pull down. If it doesn’t
affected the microcontroller movement to make so open, it is no problem. Load capacity of so disturb high speed
movement of EEPROM. If this load capacity is 100pF or below, BU9829GUL-W can move in 2.5MHz
(Vcc1=1.6V~1.8V) or 5MHz (Vcc1=1.8V~3.6V)
1.3 Input pin pull up, pull down resistance
The design method of pull up/pull down resistance for input and output are as follows.
1.3.1 Pull up resistance Rpu of input terminals
CSB
Fig.47 CSB terminals
equivalent circuit
SCK, SI
SO
Example) When Vcc=5V, VILE=1.5V, VOLM=0.4V, IOLM=2mA,
from the equation①,
VILE : EEPROM VIL specifications
VOLM : Microcontroller VOL specifications
IOLM : Microcontroller IOL specifications
Fig.50 Input terminal pull up resistance
Rpu
2.3[kΩ]
Rpu
5-0.4
2×10
-3
With the value of Rpu to satisfy the above equation, VOLM
becomes 0.4V or below, and with VILE(=1.5V), the equation
is also satisfied.
Rpu
VOLM
VILE
…②
…①
VCC-VOLM
IOLM
Microcontroller
EEPROM
“L” input
“L” output
Rpu
IOLM
VOLM
VILE
Fig.48 SCK,SI terminals
equivalent circuit
Fig.49 SO terminals
equivalent circuit


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