BU91796MUF-M Datasheet, PDF (18/27 Pages) Rohm – Low Duty LCD Segment Driver for Automotive application

BU91796MUF-M MAX 80 segments (SEG20×COM4)
Datasheet
Cautions in Power ON/OFF
BU91796MUF-M has “P.O.R” (Power-On Reset) circuit and Software Reset function.
Keep the following recommended Power-On conditions in order to power up properly.
Set power up conditions to meet the recommended tR, tF, tOFF, and Vbot specification below in order to ensure P.O.R
operation.
Set pin TEST2=”L” to enable POR circuit.
VDD
tF
tR
tOFF
Vbot
Figure 21. Power ON/OFF Waveform
Recommended condition of tR, tF, tOFF, Vbot (Ta=25°C)
tR^(Note)
tF^(Note)
tOFF^(Note) Vbot^(Note)
1ms
to 500ms
1ms
to 500ms
Min 20ms
Less than
0.1V
(Note) This function is guaranteed by design, not tested in production process.
If it is difficult to keep above conditions, execute the following sequence as quickly as possible after Power-On.
Setting TEST2="H" disables the POR circuit, in such case, execute the following sequence.
Note however that it cannot accept command while supply is unstable or below the minimum supply range.
Note also that software reset is not a complete alternative to POR function.
1. Generate STOP Condition
VDD
SDA
SCL
2. Generate START Condition.
STOP condition
Figure 22. Stop Condition
VDD
SDA
SCL
START condition
Figure 23. Start Condition
3. Issue Slave Address
4. Execute Software Reset (ICSET) Command
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8.Feb.2016 Rev.001