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UPD16680 датащи(PDF) 12 Page - NEC

номер детали UPD16680
подробное описание детали  1/53, 1/40 DUTY, LCD CONTROLLER/DRIVER WITH BUILT-IN RAM
PDF  44 Pages
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производитель  NEC [NEC]
домашняя страница  http://www.nec.com/
Logo NEC - NEC

UPD16680 датащи(HTML) 12 Page - NEC

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Data Sheet S12694EJ2V0DS00
12
µµµµPD16680
5.2.2 To use internal driving circuit and D/A converter ( VEXT = L , DACHA = H )
To use D/A converter, it is possible to adjust reference voltage VREF inputted to AMPIN(+) pin for LCD driving by
command.
To set 6-bit data to D/A converter register, reference voltage VREF is choose one level from 64 level in 1/2 VDD to VDD.
The formula of VLC1 is as same written in Equation 5-1.
Figure 5-3 Using internal power supply select and D/A converter
VDD
VDD
to Internal driving circuit
D/A
Converter
AMPIN(-)
AMPout
VLC1
R2
R1
C1
+
−
Rth
AMPIN(+)
DACHA
Open
VREF
.
5.2.3 To use external driving circuit ( VEXT = H )
When external voltage supply circuit for LCD driving is chosen, operational amplifier incorporated IC is off.
Therefore, it is impossible to use operational amplifier for LCD driving and D/A converter function. LCD driving
voltage is adjust by the voltage inputted to VLCD and VLC1 pins directly.
Remarks 1. Set VLCD
≥ VLC1.
2. DACHA , AMPIN(+), AMPIN(-) are CMOS input. Set H level or L level.
3. Set AMPOUT pin "open".



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