UPD16680 datasheet(11/44 Pages) NEC

部品番号	UPD16680

部品情報	1/53, 1/40 DUTY, LCD CONTROLLER/DRIVER WITH BUILT-IN RAM

PDF	44 Pages

Scroll/Zoom	100%

メーカー	NEC [NEC]

ホームページ	http://www.nec.com/

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11 / 44 page

Data Sheet S12694EJ2V0DS00

µµµµPD16680

5.2 LCD driving circuit

5.2.1 To use internal driving circuit, not to use D/A converter ( VEXT = L , DACHA = L )

When to internal driving circuit is chosen, boosted voltage be used for power of internal operational amplifier

adjusting LCD driving voltage. To connect external resister R1, R2, and input reference voltage to AMPIN(+) pin. It is

possible to adjust LCD driving voltage of VLC1 . If using thermistor to adjust LCD driving voltage according to the

temperature characteristic of LCD panel, we recommend connecting it with R2 in parallel.

The value of VLC1 can be computed by the following formula.

Equation 5-1

VLC1 = AMPIN(+) = (1+

) VREF

Remark R2

′ =

Figure 5-2 When not using Internal power supply select or D/A converter

VREF

to Internal driving circuit

D/A

Converter

AMPIN(-)

AMPout

VLC1

Rth

AMPIN(+)

DACHA

−

′

R2 x Rth

R2 + Rth

UPD16680 データシート(PDF) 11 Page - NEC