BU9797FUV Datasheet, PDF (20/28 Pages) Rohm – Integrated Buffer AMP for LCD Driving

BU9797FUV MAX 144 segments (SEG36×COM4)
Datasheet
Cautions in Power ON/OFF
This device has “P.O.R” (Power-On Reset) circuit and Software Reset function.
Please keep the following recommended Power-On conditions in order to power up properly.
Please set power up conditions to meet the recommended tR, tF, tOFF, and Vbot spec below in order to ensure P.O.R
operation
VDD
tF
tR
tOFF
Vbot
Recommended condition of tR, tF, tOFF, Vbot (Ta=25°C)
tR
tF
tOFF
Vbot
Max 5ms
Max 5ms
Min 20ms
Less than
0.3V
Figure 19. Power ON/OFF waveform
If it is difficult to meet above conditions, execute the following sequence after Power-On.
1. Generate STOP condition
Figure 20. Stop Condition
2. Generate START condition.
Figure 21. Start Condition
3. Issue slave address
4. Execute Software Reset (ICSET) command
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥15ï½¥001
20/25
TSZ02201-0P4P0D300820-1-2
5.Aug.2014 Rev.001