Repair NOKIA 3510i / 3530 Circuit

Repair NOKIA 3510i / 3530 Circuit

Connecting a nokia 3510i / 3530 display to the parallel port:

The wiring is based on the wiring of optrex 323 and pcd8544-based displays to the parallel port. As i didn't know of any other projects like this (with nokia 3510i/3530 displays connected to the parallel port) i had to chose a wiring-'standard' for myself.

Wiring

Signals:

+------------------------+

1 2 3 4 5 6 7 8
# # # # # # # # 1 .. /RES
===#=#=#=#=#=#=#=#== 2 .. /CS
+--====================--+ 3 .. GND
4 .. SI (SDATA)
5 .. SCLK
rear view 6 .. Vio
connector is visible 7 .. Vflash
8 .. Vout
N3510i

+------------------------+

Signal name PC LCD Signal name
---------------------------------------------------------
Data 0 2 4 SI serial data input of LCD
Data 1 3 5 SCLK serial clock line of LCD
Data 2 4 2 /CS chip select
Data 5 7 1 /RES active low reset
Data 7 9 - Backlight (optional, not on display)
Ground 18 3 GND Ground for printer port and display voltages
-- 6 Vio 1.8V chip power
-- 7 Vflash 2.8V display power
-- 8 Vout output of display-internal dc/dc converter
(Vout -> capacitor -> GND to avoid noise)

circuits:

connecting n3510i/3530 displays to the parallel port


Part list: Part# Type Value Annotation

---------------------------------------------------------------------------------------
R1-R5 Resistor 1 kOhm
R6 Var.Resistor eg. 100 Ohm or higher value if needed;
or simply a resistor with fixed value
C1 Capacitor eg. 0.1 uF for stabilisation of display
(0.22 uF or other values are fine just as well)
T1 Transistor eg. BC547
D1 Diode eg. 1N4148

Remarks:
R5, R6, T1, D1 are needed in combination with LED background light only!be warned: without background light the display is hardly readable!
Vio ought to be connected to 1.8V but I did quite well without even connecting it.as always: just because it worked for me doesn't mean that it will work for you!
i used the original SMD-leds from the Nokia 3510i cellphone. they needed some value around 3.1V.as i didn't like to generate two voltages, i also connected Vflash to 3.1V (rather than connecting it to the recommended 2.8V)and one again: just because it worked for me doesn't mean that it will work for you!if your display dies in flames don't blame me.

Hardware reset vs. software reset:
to save one wire it is possible to replace the /RES-wire through a R/C-circuit.
part-list is the same as above with the following exceptions: Part# Type Value Annotation
---------------------------------------------------------------------------------------
R4 Resistor 10 kOhm
C2 Capacitor 10 uF