Wenn Du stabilisierte 5V hast, schließ doch Varinate 1 über J1 - J2 an.
Versorgt dann das Display und das Backlight in einem.
http://www.produktinfo.conrad.com/da...eichen_LED.pdf
B/L driven by pin1 and 2 or 15 and 16 or A and K
No. Symbol Function
1 Vss Gnd, 0V
2 Vdd +5V
15 A* 4.2V for LED
16 K Power Supply for LED 0V
USAGE OF LED BACKLIGHT
THERE ARE THREE POSSIBILITIES TO USE LED BACKLIGHT IN ANAG VISION CHARACTER MODULES.
- DRIVING THE LED THROUGH A CURRENT LIMITING RESISTANCE (RA) WHICH IS ALREADY INCLUDED IN THE LCM, BY EXTERNAL 5V TO J1 AND J2 BETWEEN PIN 1 AND PIN 2.
- PROVIDING 5V BY PIN 15 AND 16 OF THE INTERFACE TO DRIVE THE LED, J15 AND J16 MUST BE SHORTENED AND RA = 3~7 OHMS IN THIS CASE.
- PROVIDING 4.2V BY DIRECT CONNECTION TO THE LED THROUGH A CURRENT LIMITING RESISTANCE.
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