STM32 Multiple USART Driver
Recently, I am developing a small project which utilize many many uart device. The core controller chip is a STM32 Cortex-M3 Chip which has 5 UARTS. In order to make full use of these UART interface, I just customized a small USART Driver which can make full control of 5 UARTS.
Due to STM32’s restrictions , only UART1 to UART 4 has the ability of DMA Write, so
EDN Design Ideas – Download Them All from 1999 to 2009
Recently, My favourite magazine EDN have changed their website style. But it caused many problem. Now I cannot find new design ideas from the website. So I just make a google , it tell me that they just hidden the design ideas to magazine issue page. here is the link.
But for your convience, I uploaded all design ideas from Year 1999 to Year 2009, 11 years in all. You can download them all
Study Notes | How to reduce the ripple noise voltage
Recently, I need to design a filter to deal with the problem of a ripple voltage caused by a SMPS(Switch Mode Power Supply). But it need so much tricky to solve this problem. So here is a guideline to make it more easily to slove this problem.
1. How to measure the ripple voltage ?
The methods to measure the ripple voltage are diverse, but there is a standard which is developed by a Japan Power Module Manufacturer (TDK Power). It provide a standard procedure called JEITA-RC9131A to measure a power supply’s output ripple voltage. Here is the detailed method.
Zener Diode Part List
Recently, I use some zener diode as a reference source to drive my comparator circuit.
So I made a Zener Diode List which from my "Search Job".
Here is the spreadsheet:
1N4099 ~ 1N4135 LOW CURRENT OPERATION 6.8V@250uA IZT LOW REVERSE LEAKAGE AND LOW NOISE CHARACTERISTICS 1N4158 ~ 1N4193 6.8V@37mA IZT
1N4400 ~ 1N4426 6.8V@37mA IZT
1N4614 ~ 1N4627
1N4678 ~ 1N4717
1N4728 ~ 1N4763
1N5225 ~ 1N5281
1N5333B~1N5388B
They are all Zener Diode, which can be easily got the stores. Here is a PDF which covers all diode
HOT!! That Chip burned my finger
Recently, I solve a problem which make a DA converter very very hot boiler. But thanks god, it works very well.. so other guys just ignore that problem, errr, I want to fix it.
Study Notes | Cadence Allegro SPB
After nearly 3.5 years working in Creative, I finaly decided to change a job with more chanlledge which I never encoutered.
In a new company, I decide to use OrCAD + Allegro to finish all projects. In next 3~4 weeks, I will write some notes about how to use Allegro to draw a PCB Board. Orcad is somebit of easy job for me because of that I have used a lot in PSpice Simulation Job.
1. How to draw Component’s footprint in Allegro
2. How to Place Component’s footprint
Study Notes | High Speed PCB Layout Guideline
As you all know, I am a heavy search-depent person which got almost information from Google. So in my last year, I give a present a KeyNote to my colleagues on the Topic of "How to Google Everything".
And as an electronics engineer myself, I also have collected many design rule from Internet. Most of them coming from Semiconductor Corp (TI, NSC, LT, Onsemi, ... ). So here I gave my version of PCB Design GuideLine.
It will be the first one of my series Guide Book called - TGuide Book Series.
So Here is the 1st one. High Speed PCB Layout Guide Book
Very First Post of My Very First Blog
Hi, everybody. This is a blog site which mainly focus on the Technical stuff ranges from electronics design example, principle behind a circuit , how to program, and so on.
My Name is Chenxiang Hsu. And I am an electronics designer which work in a small company dealing with hardware design job. If you wanna to talk with me, just write a email to me
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- STM32 Multiple USART Driver
- EDN Design Ideas – Download Them All from 1999 to 2009
- Study Notes | How to reduce the ripple noise voltage
- Zener Diode Part List
- HOT!! That Chip burned my finger
- Study Notes | Cadence Allegro SPB
- Study Notes | High Speed PCB Layout Guideline
- Very First Post of My Very First Blog
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