Voltage Booster Circuit (Bstvol); Reference Voltage Circuit (Refvol) - Panasonic MN101L Series User Manual

Chapter 17
LCD
17.3.2

Voltage Booster Circuit (BSTVOL)

This LSI has a built-in booster circuit (BSTVOL) for LCD drive which generates a voltage of 2 or 3 times the
LCD reference voltage.
2 or 3 Times Boosting
When BSTVOL generates 2 or 3 times, input the LCD reference voltage (V
(When REFVOL is used, the above voltage input is not needed.)
Three times the reference voltage (V
output from the VLC2 pin.
Insert a capacitor at VLC1-VSS, VLC2-VSS and C1-C2 pins.
2 Times Boosting
When BSTVOL generates 2 times, input the LCD reference voltage (V
VLC2 and VLC3 pins.
2 times the reference voltage (V
Insert a capacitor at VLC1-VSS and C1-C2 pins.
In 2 or 3 times boosting, the condition of "1/3 × V
In 2 times boosting, the condition of "1/2 × V
..
..
17.3.3

Reference Voltage Circuit (REFVOL)

This LSI has a built-in reference voltage circuit (REFVOL), which can be used with BSTVOL to generate LCD
drive voltage. The output voltage of REFVOL is independent of VDD30, and is generated from 0.9 V to 1.8 V.
REFVOL outputs the reference voltage from VLC3, and BSTVOL outputs the boost voltage from VLC1/VLC2.
When using the BSTVOL and the REFVOL, connect a capacitor of 0.22 µF to VLC1, VLC2, VLC3, C1 and C2.
For more details, refer to [17.3.4 LCD Drive Voltage Selection].
XVII - 18 Operation
) is output from VLC1 pin, and two times the reference voltage (V
LC3
(V )) is output from VLC1 pin.
LC2 LC3
) from VLC3 pin.
LC3
= V ) from the short-circuit pin of
LC2 LC3
≤ V ≤ 1.2 V" must be ensured.
DD30 LC3
≤ V ) ≤ 1.8 V" must be ensured.
(= V
DD30 LC2 LC3
) is
LC3