UPD16680 datasheet(14/44 Pages) NEC

14 / 44 page

Data Sheet S12694EJ2V0DS00

µµµµPD16680

5.4 Setting BIAS value

When internal driving circuit chosen, by connecting the interval of the pin VLCBS1, VLCBS2, VLCBS3 outside the IC, the

bias value can be set from the 1/6 bias, the 1/7 bias, the 1/8 bias.

Bias value

Pin connection

1/8 bias

VLCBS1, VLCBS2, VLCBS3 All open

1/7 bias

To connect VLCBS1 and VLCBS2, or VLCBS2 and VLCBS3

1/6 bias

To connect VLCBS1 and VLCBS3, VLCBS2 is open.

5.5 Voltage followers for level power supply

By the input of AMPCHA pin, it controls voltage follower for the LCD drive level power supply.

• LCD driving mode ( AMPCHA = L )

When this mode is chosen, The voltage follower maximizes electric current supply ability for LCD drive. It

doesn't need to connect the external capacitor for the level stability.

• Level capacitor mode ( AMPCHA = H )

When this mode is chosen, The voltage follower maximizes electric current supply ability for the external

condenser charging. In this mode, it needs to connect the external capacitor ( 0.1 to 1.0

µF ) for the level stability.

Caution

When using this mode without connecting capacitor, the display dignity will be bad.

UPD16680 Fiches technique(PDF) 14 Page - NEC