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View Full Version : Interfacing USB & P89v51RD2



akshay66
03-08-2010, 09:26 PM
Hi all,

Have a look at this:

http://www.nskelectronics.in/89v51rd2_flasher_-_usb.html

The board is cheap about 450/-.I wanted to know how is usb interfaced to uC.Is it directly connected to uC i don't think so as 89v51rd2 has no capabilities of usb or it has usb to 232 chip mounted under the board??

If the usb is directly connected to uC can anyone explain me whats the concept after this , After all those years of soldering i now finally have a great experience & hope i'll make one board myself.

Regards Akshay,

avinash_g
03-09-2010, 10:33 AM
When I looked at the USB Drivers they are For SiLabs CP210X Single Chip USB to serial convertor chip. They are small SMT Chip so must be mounted on the TRACK side of PCB hence not visible on the PCB !!!

avinash_g
03-09-2010, 10:35 AM
See this board

http://shop.myavr.com/Systemboards/mySmartControl%20M8,%20equipped.htm?sp=article.sp. php&artID=100002

It also has the CP2102 chip.

I remember that the chips comes in a QFN Pack (may be, I am not sure).

akshay66
03-09-2010, 10:47 AM
http://images.google.co.in/images?hl=en&gbv=2&tbs=isch:1&q=CP2102&sa=N&start=20&ndsp=20

All images have QFN package.I also think they are available in QFN package only.

I'll have to read data sheet.

avinash_g
03-09-2010, 12:13 PM
Better Go For FT232RL in TSSOP package.

akshay66
03-09-2010, 12:30 PM
Thanks but i already knew about the chip.

http://farm3.static.flickr.com/2112/2393296401_b7619b4e6b.jpg

vikas
03-09-2010, 12:40 PM
Whats the cheapest USB to Serial like Ft232RL / CP2102 variant you getting here in India ? .

akshay66
03-09-2010, 01:08 PM
What is it??

avinash_g
03-09-2010, 01:31 PM
I think CP2102 must be cheaper as those Guys are given board in 450 ! Please check with whole sellers about the pricing as you must be needing few hundreds of them.

akshay66
03-09-2010, 01:41 PM
Please check with whole sellers about the pricing as you must be needing few hundreds of them.

I didn't get you?? & i am not buying that board.

vikas
03-09-2010, 01:47 PM
Im looking at chip pricing for Ft232RL / CP2102 and not the board pricing.

akshay66
03-09-2010, 01:51 PM
You can use PL2303HX it has the same pin configuration as of FT232RL. Single chip costs Rs250 if buy more than hunder then maybe 190-200.

avinash_g
03-09-2010, 04:20 PM
@akshay66

I told that to Vikas. They may need cp2101 for their ARP.

avinash_g
03-09-2010, 04:22 PM
@akshay66

ft232rl costs 250 or less.

akshay66
03-09-2010, 05:17 PM
Oh!!Didn't know that.