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BU99901GUZ-W (32Kbit)
Datasheet
● I 2 C BUS input / output circuit
○ Input (SCL, SDA)
Figure 47. Input pin circuit diagram
○ Input/Output (SDA)
VDD
Figure 48. Input /output 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 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.
V CC
tR
Recommended conditions of tR,tOFF,Vbot
tR tOFF Vbot
10ms or below
10ms or longer
0.3V or below
tOFF
Vbot
100ms or below
10ms or longer
0.2V or below
0
Figure 49. Rise waveform diagram
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'.
V CC
tLOW
SCL
SDA
A ft er V cc bec omes st able
Af t er Vcc becom es stab le
tDH
tSU:DAT
tSU:DAT
Figure 50. When SCL='H' and SDA='L'
Figure 51. When SCL='H' and SDA='L'
b) In the case when the above condition 2 cannot be observed.
→ After power source becomes stable, execute software reset(Page17).
c) In the case when the above conditions 1 and 2 cannot be observed.
→ Carry out a), and then carry out b).
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? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
20/23
TSZ02201-0R2R0G100280-1-2
4.SEP.2012 Rev.001
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