BR24L02NUX-WTR Rohm Semiconductor, BR24L02NUX-WTR Datasheet - Page 36

• Manufacturer Part Number: BR24L02NUX-WTR
• Description: IC EEPROM 2KBIT 100KHZ VSON8
• Manufacturer: Rohm Semiconductor
• Series: -r

Specifications of BR24L02NUX-WTR

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 2K (256 x 8)
• Speed: 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-UFDFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

●I
●Notes on power ON
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2
○Input (A0, A1, A2, SCL, WP)
○Input/Output (SDA)
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.
C BUS input / output circuit
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 .
b) In the case when the above condition 2 cannot be observed.
c) In the case when the above conditions 1 and 2 cannot be observed.
→Control SCL and SDA as shown below, to make SCL and SDA, 'H' and 'H'.
→After power source becomes stable, execute software reset(P26).
→Carry out a), and then carry out b).
SCL
SDA
V
CC
After Vcc becomes stable
V
CC
0
Fig.57 When SCL='H' and SDA='L'
Fig.56 Rise waveform diagram
Fig.54 Input pin circuit diagram
Fig.55 Input /output pin circuit diagram
tOFF
tDH
tLOW
tR
tSU:DAT
Vbot
36/40
Recommended conditions of tR,tOFF,Vbot
100ms or below
10ms or below
tR
After Vcc becomes stable
Fig.58 When SCL='H' and SDA='L'
10ms or longer
10ms or longer
tOFF
tSU:DAT
Technical Note
2009.09 - Rev.D
0.3V or below
0.2V or below
Vbot