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BU9889GUL-W (8Kbit)
Datasheet
● I 2 C BUS input / output circuit
○ Input (A2, SCL, WP)
Figure 46. Input pin circuit diagram
○ Input/Output (SDA)
Figure 47. 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 t R , t OFF , and Vbot for operating POR circuit.
t R
V CC
Recommended conditions of t R , t OFF , Vbot
t R
t OFF
Vbot
0
t OFF
Vbot
10ms or below
100ms or below
10ms or longer
10ms or longer
0.3V or below
0.2V or below
Figure 48. 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 49. When SCL='H' and SDA='L'
Figure 50. 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(Page 16).
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
TSZ02201-0R2R0G100490-1-2
05.SEP.2012 Rev.001
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