0. Open the project and click the [Open Editor] button in the upper right corner

1 Introduction

HDMI to VGA converter with audio output made using CS5213 chip

2. There seems to be nothing to say. Tell me why you do this.

The main reason is that my monitor happens to be an old monitor like VGA and I bought it when DVI digital signal came out, and so does my graphics card (GTX750).

Although the GTX750 has a DVI direct output, this monitor also has a DVI input.

But the monitor also has a VGA interface, which is sometimes used for debugging and connecting devices or game consoles. However, these devices all have HDMI output, so an HDMI to VGA converter is required, although it is very cheap to buy this online from Ma Yun.

It even reached 7.47 yuan.

This chip costs RMB 2.80 a piece, plus the peripherals and sockets (an HDMI socket costs about RMB 1 each), it’s RMB 5 without the casing.

But you can use this to practice soldering, because this chip is QFN32 packaged.

I often need to solder QFN packaged chips when I work, but many novices stay away from this kind of package, so it is perfect for practicing.

This chip is actually a digital-to-analog conversion chip. The processing of this chip requires soldering skills.

You may encounter but are not limited to these problems:

VGA output resolution errors, misalignment, flickering screens, yellow screens, green screens, red screens, noise in the output sound, etc. I think this is also an exercise in my troubleshooting ability.

3. Some things to note

1. TYPE-C power supply is reserved. In fact, it can not be used, and the power supply is enough (referring to the graphics card output, I don’t know about the others)

2. The LDO can be replaced with a low voltage difference. AMS1117-3.3 is used here, and there is also an LDO inside the chip. The external LDO and the resistor R3 can be welded one by one. The chip temperature will be lower if the external LDO is used.

3. HDMI can have 100ohm impedance matching (white prostitute boards can't do it, it will cost extra), and magnetic beads can be added to prevent interference and other improvement measures.