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BR24L01AFV-WE2 데이터시트(PDF) 36 Page - Rohm |
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BR24L01AFV-WE2 데이터시트(HTML) 36 Page - Rohm |
36 / 41 page Technical Note 36/40 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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