LG128645 128 x 64 dots Built in 8192 Chinese Fonts ABSOLUTE MAXIMUM RATINGS Item Supply Voltage(Logic) Supply Voltage(LCD) Input Voltage Operating Temp. Storage Temp. MECHANICAL DATA Symbol Min. Max. Unit VDD - VSS VO - VSS VI Topr Tstg -0.3 5.5 -0.3 -0.3 7.0 VDD + 0.3 70 80 V V V C -20 -30 C â0.25V ) Symbol Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage Supply Current LCD Driving Voltage VIH VIL VOH VOL I DD VO - VSS Test Condition --- Typ. Min. 0.7VDD - 0.3 I OH = - 0.1mA 0.8VDD I OL = 0.1mA 0 -VDD = 5.0V -Ta=25 C ----- Pin Symbol Level V V V V mA 1 2 3 4 VSS V DD NC RS R/W E 0V +5V -- BLOCK DIAGRAM Control Signals ST7921 VSS VDD RS(CS) R/W(SID) E(SCLK) PS /RST LCD Controller LSI 64 SEG 128 x 32 dots 128 x 32 dots 32 COM 32 SEG DB0 V 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 PSB NC /RST NC LEDA LEDK H/L H/L _ H,H >L H/L H/L H/L H/L H/L H/L H/L H/L H/L -L -+5V 0V Function GND Power supply for logic No connection H : Data L : Instruction code H : Read L : Write Enable signal Data bus line H: Parallel mode L: Serial mode No Connection Reset signal, active "L" No connection Power supply for LED backlight 96 SEG LED BACKLIGHT SPECIFICATIONS (Ta=25 C) DB7 LEDA LEDK 64 SEG 32 COM ST7920 mm mm mm mm g Max. Unit V DD 0.6 V DD 0.4 5.0 -- 3.0 6.5 Unit Item PIN CONNECTIONS ELECTRICAL CHARACTERISTICS ( V DD =5V Item Nominal Dimensions Module Size ( W x H x T ) 93.0 x 70.0 x 10.0/13.5 72.0 x 39.0 Viewing Area ( W x H ) Dot Pitch ( W x H ) 0.52 x 0.52 0.48 x 0.48 Dot Size ( W x H ) Weight (Reflective/LED) Approx. 55/75 Item ST7921 LED B/L Control Signals Forward Voltage Forward Current Emission Wave Length Symbol Typ. Max. Unit Vf If λp 4.1 300 568 4.3 --- V mA nm