Nokia N70 LCD

kbiva Nokia LCD, ,

NokiaN70 NokiaN70_LCD_front

Here is LCD from Nokia N70 mobile phone.

LCD specifications:

  • Type: TFT, 262K colors (18 bit/pixel).
  • Resolution : 208 x 176 pixels.
  • Size: 2.1 inches.
  • Controller: MagnaChip MC2PA8201 compatible.
  • Backlight: 4 LEDs.
  • Connector: 24pin with 0.4mm pitch.

The connector is the same that I used with Nokia E61 LCD.

Connector schematics from the datasheet:

NokiaN70_LCD_back NokiaN70_LCD_connector NokiaN70_LCD_connector_pinout NokiaN70_connector_schematics

The adapter board with mounted connector is the same that I used with Nokia E61 LCD, but pinout is different. I soldered on a hot plate connector to the adapter board, and attached adapter board with two bolts to a bigger plastic board. The LCD is held in place with double-sided adhesive tape:

NokiaE61_adapter_board_soldered NokiaN70_LCD_board

I connected it to my STM32F103VET6 microcontroller development board HY-STM32, communication is done with FSMC. (Communication interface is 8 bit parallel 8080 type). For backlight I used self-made ON Semiconductors NCP5007 LED driver board.

I also made a simple adapter board that connects HY-STM32 board and Nokia N70 board:

NokiaN70_LCD_adapter_board_hystm32 NokiaN70_LCD_adapter_board_hystm32_back

My setup:

NokiaN70_connection

Pinout from the datasheet and connections to STM32 board:

Pin No Symbol STM32 board Description
1 GND 3.3V Ground
2 WRX PD5 Write (STM32 FSMC NWE)
3 GND GND Ground
4 D0 PD14 Data 0 (STM32 FSMC D0)
5 D1 PD15 Data 1 (STM32 FSMC D1)
6 D2 PD0 Data 2 (STM32 FSMC D2)
7 D3 PD1 Data 3 (STM32 FSMC D3)
8 GND GND Ground
9 VDDL 3.3V Power supply for digital circuit (3.3V)
10 VDD 3.3V Main power supply (3.3V)
11 GND GND Ground
12 LEDIN – Connected to external NCP5007 backlight board
13 LEDOUT – Connected to external NCP5007 backlight board
14 GND GND Ground
15 CSX PD7 Chip Select (STM32 FSMC NE1)
16 D/CX PD11 Command(L) / Data(H) (STM32 FSMC A16)
17 GND GND Ground
18 D7 PE10 Data 7 (STM32 FSMC D7)
19 D6 PE9 Data 6 (STM32 FSMC D6)
20 D5 PE8 Data 5 (STM32 FSMC D5)
21 D4 PE7 Data 4 (STM32 FSMC D4)
22 TE – Tearing Effect output signal
23 RDX PD4 Read (STM32 FSMC NOE)
24 RESX PE1 Reset

Though datasheet shows that VDD voltage is 2.5V and VDDL voltage is 1.8V, both seems to work with 3.3V without problems. Backlight voltage requirement of 14V is handled by external backlight driver board.

This display has some differences from original MagnaChip MC2PA8201 datasheet:

  • LCD resolution is lower.
  • parameters for COLOUR_SET command are different.

Here is screenshot with registers right after initialization:

NokiaN70_LCD_reading

TE pin outputs “Tearing Effect Output signal”. I measured frame frequency with logic analyzer and got 74Hz:

NokiaN70_tearing_line

The source code of NokiaN70 demo is available at github.com: Nokia_N70.

The demo displays:

  • Information about display.
  • Basic colors.
  • Gradient with basic colors
  • Gradient with basic colors for all color modes (18bit, 16bit and 12bit).
  • 5 JPEG pictures, each one is displayed 3 times at different color mode (18bit, 16bit and 12bit).
  • 4 gamma curves.
  • Reading from controller registers.
  • Reading of display memory.
  • Hardware scrolling.
  • Partial mode.
  • 4 orientation modes with 10K text lines.
  • Sleep test.
  • Display on/off test.
  • Display inversion test.
  • Idle mode.
  • 1K colored rectangles.
  • 3D fire.

Video showing demo:

6 thoughts on “Nokia N70 LCD”

  3. If possible, tell me how the connections and details for atmega
    I want to use Atmega for display
    thank you

    Reply

    • Just like the others mcu, data port d0-7 to portx0-7, wr dc cs rst to other port and thats it. You just need to run it on 3,3V max. Atmega can usualy still run on 16Mhz at 3,3V. There is even bascom and C code for this driver.

      Reply

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