Are you diagnosing a symptom?
Based on the electrical characteristics and instructions from component distributors, here are important guidelines for working with the HX8872C.
[RJ45 + Magnetics] ---TP_TX/RX---> HX8872C ---PECL_TX/RX---> [Fiber Transceiver] | | [25MHz XTAL] [FX_SD pull-up] | | [LEDs with 330R resistors to VDD] hx8872c datasheet
If you are working on a specific hardware issue, please tell me:
Properly manage the EN pin to activate the device or place it in low-power standby mode. Are you diagnosing a symptom
| Command (Hex) | Name | Description | | :--- | :--- | :--- | | | SWRESET | Software reset. Resets all registers to default. | | 0x11 | SLPOUT | Exit sleep mode. Turns on the oscillator and DC-DC converter. | | 0x13 | NORON | Normal display mode on. | | 0x28 | DISPOFF | Display off. | | 0x29 | DISPON | Display on. | | 0x2A | COLADDR | Column address set (define the X range of the window). | | 0x2B | PAGEADDR | Page address set (define the Y range of the window). | | 0x2C | RAMWR | Memory write (write pixel data to GRAM). | | 0x36 | MADCTL | Memory access control (set scan direction, RGB/BGR order). | | 0x3A | COLMOD | Interface pixel format (e.g., 0x05 = 16-bit RGB565). |
The contains dozens of command registers. Here are the most essential ones you will use in firmware: | Command (Hex) | Name | Description |
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Operating the HX8872-C outside its absolute maximum ratings can cause permanent damage to the silicon die. Engineers must design the peripheral circuits with these boundaries in mind. Absolute Maximum Ratings Input Pin Voltage ( VINcap V sub cap I cap N end-sub ): Operating Ambient Temperature ( TOPRcap T sub cap O cap P cap R end-sub ): -20∘Cnegative 20 raised to the composed with power C +85∘Cpositive 85 raised to the composed with power C Storage Temperature Range ( TSTGcap T sub cap S cap T cap G end-sub ): -55∘Cnegative 55 raised to the composed with power C +125∘Cpositive 125 raised to the composed with power C Recommended Operating Conditions Core Supply Voltage ( VDDcap V sub cap D cap D end-sub ): Maximum Clock Frequency ( fCLKf sub cap C cap L cap K end-sub ): Up to (supports WVGA/SVGA resolutions at Pin Configuration and Descriptions
Standby mode control. Pulling this low puts the chip into ultra-low-power sleep mode.
