Hx8872-c Datasheet [portable] -

HX8872-C Datasheet — Quick Reference Guide

3. Integrated Power Management

  • DC-DC Converter: Integrated charge pump circuits for generating the necessary driving voltages (AVDD, VGH, VGL) from a single power supply.
  • VCOM Adjustment: Often includes internal VCOM generation or adjustment capabilities to set the common electrode voltage for optimal contrast and minimal flicker.

Part 3: Programming the HX8872-C – Command Set Summary

Unlike newer MIPI DSI displays, the HX8872-C uses a register-based command set. Below are the essential commands extracted from the datasheet:

| Command (Hex) | Function | Parameter Bytes | | :--- | :--- | :--- | | 0x01 | Software Reset | None | | 0x11 | Sleep Out (Exit Sleep Mode) | None (wait 120ms) | | 0x29 | Display ON | None | | 0x36 | Memory Access Control (orientation) | 1 byte (MX, MY, MV bits) | | 0x3A | Interface Pixel Format | 1 byte (0x05=16-bit, 0x06=18-bit) | | 0x2A | Column Address Set | 4 bytes (start/end col) | | 0x2B | Row Address Set | 4 bytes (start/end row) | | 0x2C | Write Memory (RAM data write) | Variable (pixel data) |

What is the HX8872-C?

The HX8872-C is a TFT-LCD panel timing controller (TCON) or a display driver IC, often used in small to medium-sized LCD panels (e.g., 3.5″ to 7″). It’s typically produced by Himax Technologies (common “HX” prefix). This IC converts incoming video data (like RGB, LVDS, or MIPI) into signals that drive column and row drivers of an LCD. hx8872-c datasheet

Where to get the official datasheet

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Issue B: Flickering display

  • Cause: Inadequate EMI filtering or ground bounce.
  • Fix: Add a ferrite bead (e.g., BLM18HG601SN1) on VDD_MIPI. Implement spread spectrum clocking via register 0x12.

2.2 Absolute Maximum Ratings

Exceeding these values (from the hx8872-c datasheet) will destroy the IC:

  • Supply Voltage (VCI): -0.3V to +4.6V
  • Logic Input Voltage: -0.3V to VCI +0.3V
  • Operating Temperature: -40°C to +85°C (industrial grade) or -20°C to +70°C (commercial)
  • Storage Temperature: -55°C to +125°C

5. Timing Requirements (RGB Input)

The HX8872-C samples RGB data on the rising edge of PCLK by default (programmable to falling edge). Key timing constraints from the datasheet: HX8872-C Datasheet — Quick Reference Guide 3

  • PCLK Period: 12.5 ns to 100 ns.
  • HSYNC Pulse Width: Minimum 1 PCLK cycle.
  • VSYNC Pulse Width: Minimum 1 HSYNC line.
  • DE Setup Time: > 3 ns before PCLK rising edge.
  • DE Hold Time: > 1.5 ns after PCLK rising edge.
  • Data Setup Time (RGB): > 4 ns.
  • Data Hold Time (RGB): > 2 ns.

Failure to meet these timings results in pixel corruption or image tearing.