L L C C D D - - 2 2 0 0 x x 4 4 B B 20x4 Liquid Crystal Display with HD44780 driver (Blue Backlight and White Character) Specifications Electrical Characteristics Display Format 20 characters x 4 lines Drive Method 1/16 duty, 1/5 bias LCD Type STN Blue LED Backlight White Viewing direction 6: 00 Operating Temperature -20°C to 60°C Power Supply Block Diagram DB0 16 LCD PANEL V DD 8 V dd- V o DB7 80 80 V o VR V dd E U1 40 R/W U2 U3 RS V SS V o V dd 4 GND V ss V dd =V o :LCD driving voltage VR: 10K – 20K A LED BACKLIGHT K Parameter Symbol Condition Stand value UNIT Min. Typ. Max. Supply Voltage for Logic V DD -V SS - 4.5 5.0 5.5 V Supply Voltage for LCD V DD -V o - - 4.7 - V Input Logic HIGH V IH - 2.2 - V DD V Input Logic LOW V IL - -0.3 - 0.6 V Output Logic HIGH V OH -I OH =0.2mA 2.4 - - V Output Logic LOW V OL I OL =1.2mA - - 0.4 V Power Supply Current without backlight V DD V DD =5.0V - 2.0 5 mA Power Supply Current with backlight I LED V LED =5.0V - 72 80 mA
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Specifications Electrical Characteristics Display Format 20
characters x 4 lines Drive Method 1/16 duty, 1/5 bias LCD Type STN
Blue LED Backlight White Viewing direction 6: 00 Operating
Temperature -20C to 60C
80 80 Vo VR Vdd E U1 40 R/W U2 U3 RS VSS Vo Vdd 4 GND Vss
Vdd=Vo:LCD driving voltage VR: 10K 20K A LED BACKLIGHT K
Parameter Symbol Condition Stand value UNIT Min. Typ. Max.
Supply Voltage for Logic VDD-VSS - 4.5 5.0 5.5 V Supply Voltage for
LCD VDD-Vo - - 4.7 - V Input Logic HIGH VIH - 2.2 - VDD V Input
Logic LOW VIL - -0.3 - 0.6 V Output Logic HIGH VOH -IOH=0.2mA 2.4 -
- V Output Logic LOW VOL IOL=1.2mA - - 0.4 V Power Supply Current
without backlight VDD VDD=5.0V - 2.0 5 mA
Power Supply Current with backlight ILED VLED=5.0V - 72 80
mA
