【CH554 type DIY】USBDDS (Part 1)

ljj3166

【CH554 type DIY】USBDDS (Part 1) [Copy link]

 

When applying for the evaluation board, I cheated a few samples and swore in the post that as long as there were samples, I would DIY. I didn't think Qinheng would not give me samples. Unexpectedly, when I received the board, I found that they also brought 3 pieces of CH554T and CH554E. Uh..., I made a date. No, I dug a hole myself, and I have to fill it up. DIY at home, it is impossible to be like the company with all kinds of instruments. A few years ago, when I was playing with MEGA single-chip chicken, I accidentally wrote the wrong fuse bit, and I needed an external clock to rescue the single-chip chicken. I searched the toolbox, but I couldn't find a small tool that could generate a clock. Later, I had no choice but to use other single-chip chickens to use IO to generate one. So, the tool that can generate a simple small clock has become a knot in my heart. Last year, I cheated a DDS chip AD9838 from Analog Devices. It can generate up to 8MHz clock and support sine, square and triangle waves. Well, it's time to make one. Schematic diagram: Regardless of the cost, the level conversion IC is also made into a proof. TOP side: Bottom side: It's okay if it's ugly, the boss said that the back of the PCB touch key should be a mesh copper grounding. It is indeed the case in actual measurements. If you don't believe it, try the back of the touch key of the evaluation board. You can also identify the big bag on the operating hardware, haha. Front side of PCBA I tried my best to solder the QFN. The boss said that the PCBA without flying wires is not easy to debug, so I didn't solder the switch, and directly made the flying fairy and PCBA chrysanthemum side: Assembly drawing A: It's great to reuse the leftover modules. Can I say that I can't afford to buy capacitors anymore? They're so expensive. Assembly drawing B, or assembly B for short: Well, it's small and exquisite. Try it with an electric switch Give me stable happiness.... Put a frequency in to test it. There are no test tools in the study, except this one: When I purchased from TI's official website in 2015 or 2016, I won an oscilloscope pen in a lottery. At first, TI in Shanghai called me and said that I won an oscilloscope. I was so happy... When I received it, I saw that it was such a low-end product. Damn it, I have been blacking TI all my life since then... Write 191126Hz sine and triangle actual measurement The difference is about 9kHz. The error is a bit large... I'll have some free time in a few days to use the oscilloscope to have a look. I've written a simple, incomplete menu interface. The frequency configuration data can be saved to DATAFLASH by touching the buttons. You can directly call it when you turn on the machine next time. There is a video with the truth After adding the USB function, the flash of CH554T has been used up by 11K. I'll go here first and try to enable more DDS functions through the host computer later This content was originally created by ljj3166, a netizen on the EEWORLD forum. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

leifengfirst

I also bought this oscilloscope, and I wonder why yours has the TI logo on it

cruelfox

Exquisitely made!

okhxyyo

Like. Like is just one word

大秦正声

Very good

jj1989

Continue to improve and add a shell.

freebsder

Bad review. Can you replace the half-pound capacitor?

ljj3166

leifengfirst posted on 2018-5-14 10:06 I also bought this oscilloscope, and I wonder why yours has the TI logo on it

The performance is a bit poor, but it's still okay for my own amateur fun and to look at the waveform

ljj3166

cruelfox posted on 2018-5-14 10:30 Beautifully done!

Thanks for the help, I just did a casual and casual fix, not worth mentioning

ljj3166

okhxyyo posted on 2018-5-14 10:30 Like. Like is just one word

Thank you for your help

ljj3166

Daqin Zhengsheng published on 2018-5-14 11:18 Very good

, thank you for your help

ljj3166

jj1989 posted on 2018-5-14 11:42 Continue to improve and add a shell.

I'm too lazy to fix it, just a small tool, no need to bother

ljj3166

freebsder posted on 2018-5-14 17:01 Bad review. Can you replace the half-pound capacitor?

Taoist priest, let go of the fox demon and let me come

沁恒USB单片机