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BR24L01AFV-WE2 데이터시트(PDF) 36 Page - Rohm

부품명 BR24L01AFV-WE2
상세설명  High Reliability Series EEPROMs I2C BUS
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BR24L01AFV-WE2 데이터시트(HTML) 36 Page - Rohm

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Technical Note
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www.rohm.com
2009.09 - Rev.D
© 2009 ROHM Co., Ltd. All rights reserved.
BR24L□□-W Series,BR24S□□□-W Series
●I
2C BUS input / output circuit
○Input (A0, A1, A2, SCL, WP)
○Input/Output (SDA)
●Notes on power ON
At power on, in IC internal circuit and set, Vcc rises through unstable low voltage area, and IC inside is not completely reset,
and malfunction may occur. To prevent this, functions of POR circuit and LVCC circuit are equipped. To assure the action,
observe the following condition at power on.
1. Set SDA = 'H' and SCL ='L' or 'H'
2. Start power source so as to satisfy the recommended conditions of tR, tOFF, and Vbot for operating POR circuit.
3. Set SDA and SCL so as not to become 'Hi-Z'.
When the above conditions 1 and 2 cannot be observed, take the following countermeasures.
a) In the case when the above conditions 1 cannot be observed. When SDA becomes 'L' at power on .
→Control SCL and SDA as shown below, to make SCL and SDA, 'H' and 'H'.
b) In the case when the above condition 2 cannot be observed.
→After power source becomes stable, execute software reset(P26).
c) In the case when the above conditions 1 and 2 cannot be observed.
→Carry out a), and then carry out b).
Recommended conditions of tR,tOFF,Vbot
tR
tOFF
Vbot
10ms or below
10ms or longer
0.3V or below
100ms or below
10ms or longer
0.2V or below
Fig.54 Input pin circuit diagram
Fig.55 Input /output pin circuit diagram
tOFF
tR
Vbot
0
VCC
Fig.56
Rise waveform diagram
tLOW
tSU:DAT
tDH
After Vcc becomes stable
SCL
VCC
SDA
Fig.57 When SCL='H' and SDA='L'
tSU:DAT
After Vcc becomes stable
Fig.58 When SCL='H' and SDA='L'


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