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2026-09-05T22:41:54Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
Technical overview of the Waveshare 4inch resistive touch LCD with 480x800 resolution and an 8080 parallel interface. Covers pinout, NT35510 controller, XPT2046 touch controller, and an STM32 example.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL17143 WSAL17143 – 4inch Resistive Touch LCD, 480×800, 8080 Parallel Interface]

== Technical overview ==
* Resolution: 480x800 pixels; the NT35510 controller supports several GRAM sizes, including 480x800 with a 24-bit color format.
* Interface: 8080 parallel MPU (8/16/24-bit); this module uses 16 of the 24 data pins D[23:0].
* Color modes: full-color mode with 1670M colors; reduced modes with 262K or 65K colors; idle mode with 8 colors.
* RGB565 (16-bit) is used by default; switching to 8-bit mode requires changing the BS resistor to the 0 side.
* Touch controller XPT2046: 4-wire resistive, 12-bit SAR ADC at 125 kHz sampling; digital I/O voltage range 1.5–5.25 V.
* TP_IRQ is LOW when touched, otherwise HIGH; TP_CS, TP_SCK, TP_SDI/SDO form the SPI interface to the touch panel.
* Pinout includes 5V/GND inputs, D0–D15 for data, LCD_CS, DC, WR, RD, RST, BL_VCC (5V or 3.3V), BL for brightness adjustment, and TP pins.
* The STM32F103ZET6 example uses the FSMC interface; specific pin assignments are listed in the 'Hardware connection' table.
* Resources include schematic, demo codes, Image2LCD tool, and datasheets for NT35510 and XPT2046.

== Notes and version constraints ==
* No explicit commands or protocol commands found in the source document; only register and GRAM access sequences over the 8080 interface are described.
* The exact circuitry for switching to 8-bit mode (BS resistor) must be confirmed by the manufacturer, as no inline schematics are available.
* The example is based on the Waveshare Open103Z development board; compatibility with other STM32 variants or MCUs is not guaranteed.
* The given pin mapping is specific to the Open103Z; other boards require adapted wiring.
* Support contact and response times (1–2 working days, GMT+8) are mentioned, but technical details on warranty or certifications are absent.

== Source and revision record ==
* [https://www.waveshare.com/wiki/4inch_Resistive_Touch_LCD 4inch Resistive Touch LCD - Waveshare Wiki]
* Source revision: 73561
* Captured: 2026-08-31T04:02:54+00:00
* SHA-256: <code>b57de2f79aadbb0181712fab6b9fd2e4a714a6c9d4eb61d5a38f6d9962c8f41c</code>

WSAL17143 – 4inch Resistive Touch LCD/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex