Post by thread:IRDA

Both HP and Temic will send specifications on their IRDA compliant transcievers. Call HP sales office and ask for technical data on HSDL-1000 or Temic sales office (or 408-988-8000) and ask for IR Remote Control Designers Kit which includes app notes and samples! Each of these only address the optical and electrical interface for IRDA. The higher levels of the protocol are defined in the IRDA spec which unfortunately costs $500 from the IR Data Association at 510-943-6546 or spam_OUTjlarocheTakeThisOuTnetcom.com TTYL, Brian. .....bbolesKILLspam@spam@microchip.com

April 17, '95 Electronic Design tells about all you'd ever want/need to know about IrDA. Summed up, its a cheap/easy RS-232-like connection. Spec'ed to 115Kbits/s and 3-6 ft. Its based around standard UART charactertics (thus works fine w/ std com software). About the only difference from RS-232 is that the high pulses (0's) are narrowed substantially to reduce tx power. This will cause a little grief with firmware uarts which expected a lot of margin on where to sample a 232 bit. The IrDA (Infrared Data Association) can be reached at jlarocheKILLspamnetcom.com. To me this may be useful in some limited applications. It will probably be closely related to PICs since they are a very common for firmware UARTs (at least around here). I'm sure I'll be rewriting some UART code soon..... -mike --------------------------------------------------------------------------- Mike Fahrion | B&B Electronics Mfg. Co. | email: .....mfahrionKILLspam.....bb-elec.com 707 Dayton Road | phone: (815) 434-0846 ext.215 PO Box 1040 | fax: (815) 434-7094 Ottawa, IL 61350 | ---------------------------------------------------------------------------

RE: IR Communications Hewlett Packard has an excellent line of very high speed IR Communication Modules. TTL In -> IR Out and back again. The modules have both send/recieve circuitry. If you get an Industry Magazine the advertise free samples. (No, I don't work for HP) Doug Sellner Beach Tech 4131 Vincent Avenue South Minneapolis MN 55410 Voice (612) 924-9193 x 521 Fax (612) 926-1145 Internet: EraseMEdsellnerspam_OUTTakeThisOuTembay.com

Remember that IrDa protocol is a vaste and several layers communication protocol. It is based on the HDLC (SDLC), and it uses several flow controls, identifiers and so on. I made a partial subset at the 8051 uC family to control a wireles printer, it took aprox 6 kbytes of code (assembler). The IrDa chips (controller and the transceiver) can also be programmed to work in "Raw InfraRed" mode, that is similar to the VCR remote controls IR modulation, and some other way. But to ensure a real communication mode, with multi devices and protocol confirmation, you need to go for real IrDa. I used chips from Temic, as the TOIM3232 and TFDS4000, but the last one is a pain in the neck to get from the distributors, except if you want to buy in 750 pieces a time (whole reel). Their explanation is that once you open the sealed package the transceivers start to suffer from humidity and can not be restocked... I wonder what happens after you solder them at the PCB... it must be some magic that stops the humidity attack. Talking to someone at Temic, this person said that during the SMD reflow the unit cooks again and fix the humidity problem... then I asked him "what about if I solder it by hand"?... the guy probably entered in "duhhhh state" because I heard a long silence at the other side of the phone.

Wagner Lipnharski wrote: > (...) > I used chips from Temic, as the TOIM3232 and TFDS4000, but the last one > is a pain in the neck to get from the distributors, except if you want > to buy in 750 pieces a time (whole reel). Their explanation is that once > you open the sealed package the transceivers start to suffer from > humidity and can not be restocked... As whithin the recent discussion about smd-soldering in a reflow oven / toaster the humidity which may vaporize is no problem after soldering - just before (or more: during the reflow soldering). > I wonder what happens after you > solder them at the PCB... it must be some magic that stops the humidity > attack. Talking to someone at Temic, this person said that during the > SMD reflow the unit cooks again and fix the humidity problem... then I > asked him "what about if I solder it by hand"?... the guy probably > entered in "duhhhh state" because I heard a long silence at the other > side of the phone. I think this guy just heard about "problems" but didn't know the whole story. Kind regards, Stefan

Wagner, have you looked at HP? I've only done the physical layer using their modules based on the HSDL-1000. I've also looked at Unitrode, Siemens, and Linear as well as the Maxim UART's mentioned earlier. All I did was test a 3ft link between PCs using low-level serial routines in C. - Tom At 09:45 AM 8/10/99 -0400, Wagner Lipnharski wrote: {Quote hidden}>Remember that IrDa protocol is a vaste and several layers communication >protocol. It is based on the HDLC (SDLC), and it uses several flow >controls, identifiers and so on. I made a partial subset at the 8051 uC >family to control a wireles printer, it took aprox 6 kbytes of code >(assembler). > >The IrDa chips (controller and the transceiver) can also be programmed >to work in "Raw InfraRed" mode, that is similar to the VCR remote >controls IR modulation, and some other way. But to ensure a real >communication mode, with multi devices and protocol confirmation, you >need to go for real IrDa. > >I used chips from Temic, as the TOIM3232 and TFDS4000, but the last one >is a pain in the neck to get from the distributors, except if you want >to buy in 750 pieces a time (whole reel). Their explanation is that once >you open the sealed package the transceivers start to suffer from >humidity and can not be restocked... I wonder what happens after you >solder them at the PCB... it must be some magic that stops the humidity >attack. Talking to someone at Temic, this person said that during the >SMD reflow the unit cooks again and fix the humidity problem... then I >asked him "what about if I solder it by hand"?... the guy probably >entered in "duhhhh state" because I heard a long silence at the other >side of the phone. ------------------------------------------------------------------------ Tom Handley New Age Communications Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

Tom Handley wrote: > > Wagner, have you looked at HP? I've only done the physical layer using > their modules based on the HSDL-1000. I've also looked at Unitrode, Siemens, > and Linear as well as the Maxim UART's mentioned earlier. All I did was test > a 3ft link between PCs using low-level serial routines in C. Yes Tom, things I said happened 3 years ago... now we have other suppliers... :) Wagner.

Well HP is pretty much the "horse's mouth" when it comes to the physical layer ;-) As you obviously know, they have extensive documentation on IrDa. - Tom At 01:58 PM 8/10/99 -0400, Wagner Lipnharski wrote: >Tom Handley wrote: >> >> Wagner, have you looked at HP? I've only done the physical layer using >> their modules based on the HSDL-1000. I've also looked at Unitrode, Siemens, >> and Linear as well as the Maxim UART's mentioned earlier. All I did was test >> a 3ft link between PCs using low-level serial routines in C. > >Yes Tom, things I said happened 3 years ago... now we have other >suppliers... :) >Wagner. ------------------------------------------------------------------------ Tom Handley New Age Communications Since '75 before "New Age" and no one around here is waiting for UFOs ;-)