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BU9897GUL-W (128Kbit)
Datasheet
● I C BUS input / output circuit
2
○ Input (A0, A1, A2, SCL, SDA)
Figure 45. Input pin circuit diagram
○ Input/Output (SDA)
Figure 46. 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
0
t OFF
Figure 47. Rise waveform diagram
Vbot
t R
10ms or below
100ms or below
t OFF
10ms or higher
10ms or higher
Vbot
0.3V or below
0.2V or below
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
After Vcc becomes stable
After Vcc becomes stable
tDH
tSU:DAT
tSU:DAT
Figure 48. When SCL='H' and SDA='L'
Figure 49. 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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TSZ22111 ? 15 ? 001
19/22
TSZ02201-0R2R0G100500-1-2
4.SEP.2012 Rev.001
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