SN8P1829
8-Bit MCU build-in 12-bit ADC + PGIA + Charge-pump Reg 128 dots LCD driver
SONiX TECHNOLOGY CO., LTD
Page 111
Version 1.0
In following diagram, in order to get suitable contrast level of LCD panel, users can add external resistor to bias pin (V1,
V2, V3) to adjust bias voltage and LCD drive current. Too much or less current makes the LCD to bring remnant
images. In normal condition, the external bias resistor value is 100K ohm. Users can connect a resistor between VLCD
and VDD to adjust the voltage level at VLCD pin or just connect VLCD to VDD directly.
Figure 12-1. Example of circuit at each bias