BR24L □□ -W Series,BR24S □□□ -W Series
Technical Note
● I 2 C BUS input / output circuit
○ Input (A0,A2,SCL)
Fig.57 Input pin circuit diagram
○ Input / output (SDA)
Fig.58 Input / output pin circuit diagram
○ Input (A1, WP)
Fig.59 Input pin circuit diagram
● 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 conditions at power on.
1. Set SDA = 'H' and SCL ='L' or 'H'
2. Start power source so as to satisfy the recommended conditions of t R , t OFF , and Vbot for operating POR circuit.
t R
V CC
Recommended conditions of t R , t OFF ,V bot
t R
10ms or below
t OFF
10ms or longer
V bot
0.3V or below
t OFF
Vbot
100ms or below
10ms or longer
0.2V or below
0
Fig.60 Rise waveform diagram
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18/40
2009.09 - Rev.D
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