8-bit MicrocontrollersのトピックRe: USB<-->Serial Converter for HC908QY4/QT4

USB<-->Serial Converter for HC908QY4/QT4

Spuck — Wed, 23 Feb 2011 08:18:07 GMT

I've build a board basically like shows in HC908QY4 datasheet (page 140, figure 15-10). I want to put a USB2Serial Converter but I see in some cases (converters) it not works correctly. So I want to know from you, expert and experienced guys, what's the best USB2Serial converter to put in my board (already built). I've looking for something and concluded that the best, for me, converters are ftdi's for yours specifications. I've listed below, some ftdi converters that I'd like, in order to easy instalation in my board. But, you're free to suggest more others converters to me.

1- DB9-USB-RS232 Modules

2- MCP2200EV-VCP (Not ftdi but its my second choice, if someone tell me that will work)

3- UC232R-10-NE "ChiPi" USB - RS232 Converter

4- FT2232H Mini-Module

5- MM232R (This is a MM232R (I dont know what mean))

6- TTL-232R-5V-PCB

7- Suggestion?

P.S: Mine project board, you can see under my dropbox file, here.

Sorry about my poor english

Thank you all!

Re: USB<-->Serial Converter for HC908QY4/QT4

Betadine — Thu, 24 Feb 2011 03:28:22 GMT

I have developed a DataLogger with the FT232R

First, I was going to use CP2102 but beacuse of the package I changed to FT232R as I understood. They both are good choices.

Be carefull with the final letter of the FT232 it changes many things. If you look a t the Datasheets you will find that FT232R its a very easy nice choice, it implements lots of features that the others not.

Take a look at the ferrite bead, cause this chips generate noise to the Vcc line, so a ferrite bead between the chip and the Vcc line is recommended.

Im now using it, without any handshaking (Point to Point), and it works very well.

One strange issue that I dont understand is when I open the COM port with the Windows Hyperterminal, then I close the port. It seems nothing but the PC(my application) cannot opent the COM port once the hyperterminal has opened and closed it (without sending nothing).

By the other hand it has worked perfectly (whenever I dont open and close the port from another source)

I use VBA and later I have make an ActiveX dll in which resides all the code.

FT232R can be connected directly to the MCU. Tx and Rx pins.

Also it doesnt need the series resistors from the USB line. They are inside the chip.

As you see FT232R only needs capacitors and a ferrite bead. It has internal oscillator, and can be work as a Master or Slave.

It doesnt need MAX232....

Well that´s my little experience with that one. Im very happy with it.

Processor explorer makes things very easy to use the UART.

Best Regards

Re: USB<-->Serial Converter for HC908QY4/QT4

Juls — Thu, 24 Feb 2011 04:18:06 GMT

I also used ft232r pretty nice if you can solder it (not really hard) you can set some pin to do alternate function like TX/RX activity to put led on

I also made a JM60 to do the same job (using cdc device code) (little tricky footprint tho)

Re: USB<-->Serial Converter for HC908QY4/QT4

bigmac — Thu, 24 Feb 2011 09:27:39 GMT

Hello, and welcome to the forum.

For monitor mode usage, the USB to serial converter requires to correctly handle break sequences. Most converters are problematic for this reason

I recall that this subject has been extensively discussed on this forum in the distant past.

Regards,

Mac

Re: USB<-->Serial Converter for HC908QY4/QT4

leofab70 — Tue, 07 Jun 2011 20:36:29 GMT

Hello,

Is there any possibility that you can upload any draw of how you make all the connection and how it works

I really appreciate your help

Leo Sandoval