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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UPD16680 датащи(PDF) 11 Page - NEC |
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UPD16680 датащи(HTML) 11 Page - NEC |
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11 / 44 page  Data Sheet S12694EJ2V0DS00 11 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 R2 R1 Rth AMPIN(+) DACHA + − C1 R2 ′ R1 R2 x Rth R2 + Rth |
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