UPD16680 查看數據表（PDF） - NEC => Renesas Technology

零件编号

产品描述 (功能)

比赛名单

UPD16680

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

NEC => Renesas Technology 

µPD16680

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.

VLC1 = AMPIN(+) = (1+ R2′ ) VREF

R1

Remark R2′ =

R2 x Rth

R2 + Rth

Equation 5-1

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

DACHA

VREF

AMPIN(+)

D/A

Converter

+

−

to Internal driving circuit

AMPIN(-)

AMPout

Rth

VLC1

R2

R1

C1

Data Sheet S12694EJ2V0DS00

11

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