AND721GST/GST-LED Intelligent Character Display AND721GST/GST-LED 4 Lines x 20 Characters Intelligent Character Display The AND721GST/GST-LED devices are compact, LCD modules that have an on-board LCD controller and driver circuit. These devices can display 160 characters (numerals, letters, symbols and Kana letters), as well as eight custom characters. Absolute Maximum Ratings (Continued) Features • • • • • • • • RoHS Compliant AND721GST: Super Twist Technology AND721GST-LED: STN with LED backlight Low voltage, +5V single power supply Controller on board (HD44780) RoHS compliant 11 commands for control Wide temperature range option (WGST) 0.60 0.55 Dot Matrix Dimensions Item Symbol Rating Unit LED Reverse Voltage VR 8 V LED Power Dissipation PD 1900 mW Operating Temperature Top 0 to +50 °C Storage Temperature Tstg -20 to +60 °C Electrical Characteristics (TA = 25°C) 2.95 0.60 0.55 0.60 Symbo l Min. Typ. Max. VDD 4.75 5.0 5.25 VDD-VO 3.0 – 6.3 High Level In Voltage (VDD = 5.0V) VIN – – VDD V Low Level In Voltage (IOH = 0.2 mA) VIH 0 – 0.6 V High Level Output Volt. (–IOH = 0.2 mA) VOH 2.4 – – V Low Level Output Volt. (IOL = 1.2 mA) VOL – – 0.4 V Item 0.60 4.75 Supply Voltage Mechanical Characteristics Item Unit V Specification Unit 98 (W) x 60 (H) x 12 (D) mm LED Forward Voltage (IF = 230 mA) VF 3.8 4.1 4.4 V Character Size 2.95 (W) x 4.75 (H) mm Viewing Area 76.0 (W) x 25.2 (H) mm LED Reverse Current (VR = 8 V) IR – – 2.4 mA Dot Size 0.55 (W) x 0.55 (H) mm Dot Pitch 0.60 (W) x 0.60 (H) mm Outline Dimensions Absolute Maximum Ratings Optical Characteristics (TA 5 = 25˚C, φ = 0°, θ = 0°) Item Symbol Min. Typ. Max. Unit Viewing Angle f – 50 – degree Symbol Rating Unit Contrast K – 6.0 – – Supply Voltage VDD 7.0 V Turn On Ton – 200 400 ms Input Voltage VIN 0 ≤ VIN ≤ VDD V Turn Off Toff – 250 400 ms IF 480 mA Item LED Forward Current 1 Product specifications contained herein may be changed without prior notice. It is therefore advisable to contact Purdy Electronics before proceeding with the design of equipment incorporating this product. Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085 Tel: 408.523.8200 • Fax: 408.733.1287 • [email protected] • www.purdyelectronics.com 7-27-99 Connector Pin Assignment AND721GST/GST-LED Intelligent Character Display Connector Pin Assignment Power Supply Pin # Signal Function 1 GND Ground 2 VDD +5 Power Supply 3 VO LCD Drive Voltage 4 RS “H” Data Input “L” Command Input 5 R/W 6 E 7 DB0 8 DB1 9 DB2 The LCD panel is driven by the voltage VDD–VO, so an adjustable VO is required for contrast control and temperature compensation. Temperature Variations Temperature VDD–VO 0°C 5.00 Read/Write +25°C 4.75 Enable +50°C 4.50 Power Supply Block Diagram 10 DB3 11 DB4 12 DB5 13 DB6 14 DB7 15 LED LED Anode (+) 16 LED LED Cathode Ground (+5V) VDD Data Bus DB0-DB7 are for 8-bit operation DB4-DB7 are for 4-bit operation VDD – VO VO VR VDD GND VDD – VO = LCD Drive Voltage VR10 to 20 kΩ Block Diagram E R/W 4 RS 40 DBO-DB7 8 40 Controller/ Driver 20 4 16 VDD VO Driver LCD 16 Driver 16 GND 40 40 20 Driver 4 Driver Dimensional Outline 7-27-99 Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085 Tel: 408.523.8200 • Fax: 408.733.1287 • [email protected] • www.purdyelectronics.com 2