AND721GST-LED

**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) 

## **Dot Matrix Dimensions** 

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**----- Start of picture text -----**<br>
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## **Mechanical Characteristics** 

|**Item**|**Specification**|**Unit**|
|---|---|---|
|Outline<br>Dimensions|98 (W) x 60 (H) x 12 (D)|mm|
|Character Size<br>Viewing Area|2.95 (W) x 4.75 (H)<br>76.0 (W) x 25.2 (H)|mm<br>mm|
|Dot Size|0.55 (W) x 0.55 (H)|mm|
|Dot Pitch|0.60 (W) x 0.60 (H)|mm|



## **Absolute Maximum Ratings** 

|**Item**|**Symbol**|||**Rating**|**Rating**|**Unit**|
|---|---|---|---|---|---|---|
|Supply Voltage|V<br>DD|||7.0||V|
|Input Voltage|V<br>IN|0|0<br>≤<br>V|V<br>IN<br>≤<br>V|V<br>DD|V|
|LED Forward Current|I<br>F|||480||mA|



|LED Reverse Voltage<br>**Item**|V<br>R<br>**Symbol**|8<br>**Rating**|V<br>**Unit**|
|---|---|---|---|
|LED Power Dissipation<br>Operating Tempera-<br>ture|P<br>D<br>T<br>op|1900<br>0 to +50|mW<br>°C|
|Storage Temperature|T<br>stg|-20 to +60|°C|



## **Electrical Characteristics (TA = 25°C)** 

||**Item**|**Symbo**<br>**l**<br>**Min.**<br>**Typ.**<br>**Max.**|**Unit**|
|---|---|---|---|
|Supply Voltage<br>po||V<br>DD<br>4.75<br>5.0<br>5.25<br>V<br>V<br>DD<br>-V<br>O<br>3.0<br>–<br>6.3<br> FE||
||High Level In Voltage<br>(V<br>DD<br>= 5.0V)|V<br>IN<br>–<br>–<br>V<br>DD|V|
||Low Level In Voltage<br>(I<br>OH<br>= 0.2 mA)<br>V<br>IH<br>0<br>–<br>0.6<br>V<br>High Level Output Volt.<br>(–I<br>OH<br>= 0.2 mA)<br>V<br>OH<br>2.4<br>–<br>–<br>V<br>Low Level Output Volt.<br>(I<br>OL<br>= 1.2 mA)<br>V<br>OL<br>–<br>–<br>0.4<br>V<br>pt TTT<br>pt<br>ET|||
||LED Forward Voltage<br>(I<br>F<br>= 230 mA)|V<br>F<br>3.8<br>4.1<br>4.4|V|
||LED Reverse Current<br>(V<br>R<br>= 8 V)|I<br>R<br>–<br>–<br>2.4|mA|



|**Optical Characteristics (TA 5 = 25˚C,**|**Optical Characteristics (TA 5 = 25˚C,**|**Optical Characteristics (TA 5 = 25˚C,**|**Optical Characteristics (TA 5 = 25˚C,**|**Optical Characteristics (TA 5 = 25˚C,**|**Optical Characteristics (TA 5 = 25˚C,**|**Optical Characteristics (TA 5 = 25˚C,**<br>φ<br>**= 0°,**|**Optical Characteristics (TA 5 = 25˚C,**<br>φ<br>**= 0°,**|**= 0°,**<br>θ<br>**= 0°)**|**= 0°,**<br>θ<br>**= 0°)**|
|---|---|---|---|---|---|---|---|---|---|
||**Item**|**Symbol**|**Min.**||**Typ.**|||**Max.**|**Unit**|
||Viewing Angle|f|–|||50||–|degree|
||Contrast|K|–|||6.0||–|–|
||Turn On|T<br>on|–|||200||400|ms|
||Turn Off|T<br>off|–|||250||400|ms|



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 • sales@purdyelectronics.com • www.purdyelectronics.com 

7-27-99 

1 

**Connector Pin Assignment** 

**AND721GST/GST-LED Intelligent Character Display** 

## **Connector Pin Assignment** 

## **Power Supply** 

|**Connector Pin Assignment**|**Connector Pin Assignment**|**Connector Pin Assignment**|||||**Power Supply**|**Power Supply**||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|**Pin #**<br>**Signal**|**Function**||||||The LCD panel is driven by the voltage V||The LCD panel is driven by the voltage V||The LCD panel is driven by the voltage V||The LCD panel is driven by the voltage V|
|1<br>GND|Ground||||||adjustable V<br>O<br>is required for contrast control and|||||is required for contrast control and|is required for contrast control and|
|2<br>V<br>DD|+5 Power Supply||||||temperature compensation.|||||||
|3<br>V<br>O<br>4<br>RS|LCD Drive Voltage<br>“H” Data Input<br>“L” Command Input||||||**Temperature Variations**<br>**Temperature**<br>0°C|||||||
|5<br>R/W|Read/Write||||||+25°C|||||||
|6<br>E|Enable||||||+50°C|||||||
|7<br>DB0|||||||**Power Supply Block Diagram**|||||||
|8<br>DB1||||||||||||||
|9<br>DB2|||||||VDD|||||(+5V)|(+5V)|
|10<br>DB3<br>11<br>DB4<br>12<br>DB5|Data Bus<br>DB0-DB7 are for 8-bit operation<br>DB4-DB7 are for 4-bit operation|DB0-DB7 are for 8-bit operation<br>DB4-DB7 are for 4-bit operation|||||VO||VDD||DD– VO|VR|VR|
|13<br>DB6||||||||||||||
|14<br>DB7|||||||GND|||||||
|15<br>LED|LED Anode (+)|||||||||VDD– VO= LCD Drive Voltage|||= LCD Drive Voltage|
|||||||||||VR10 to 20 k||VR10 to 20 k|VR10 to 20 k|
|16<br>LED|LED Cathode Ground|||||||||||||
|||||||||||||||
|**Block Diagram**||||||||||||||
|||||||||||||||
||Driver<br>Driver<br>Controller/<br>Driver<br>16<br>16<br>16<br>40<br>4<br>40<br>20<br>4<br>LCD<br>E<br>R/W<br>RS<br>VDD<br>VO<br>GND<br>DBO-DB7<br>8<br>d~~y~~<br>|<br>-~_d~~y~~<br>oe Il<br>|<br>|<br>~~—~~<br>~~—~~<br>~~>~~<br>—— ~~>~~<br>|<br>—— ~~>~~|<br>||||||||||||||
||~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|40<br>~~|~~|40<br>~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~||||
||20<br>~~|~~||||||||||||||
||~~|~~|~~|~~|~~|~~|~~|~~|Driver<br>~~|~~||Driver<br>4<br>~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~||||



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**|**V**<br>**DD**<br>**–V**<br>**O**|
|0°C|5.00|
|+25°C|4.75|
|+50°C|4.50|



**==> picture [158 x 104] intentionally omitted <==**

**----- Start of picture text -----**<br>
VDD (+5V)<br>VDD – VO<br>VO VR VDD<br>GND<br>VDD – VO = LCD Drive Voltage<br>VR10 to 20 kΩ<br>**----- End of picture text -----**<br>


## **Block Diagram** 

## **Dimensional Outline** 

Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085 Tel: 408.523.8200 • Fax: 408.733.1287 • sales@purdyelectronics.com • www.purdyelectronics.com 

7-27-99 

2