PG31 GPS USB Dev Board

From OpenCircuits
(Difference between revisions)
Jump to: navigation, search
m
m (Reverted edits by FkdR6w (Talk); changed back to last version by Freqmax)
Line 1: Line 1:
[http://jnk713.ifrance.com/img/styles/fuckit/ fuckit] [http://spirit-psyki.ifrance.com/lib/video-top.html video top sexy] [http://bakadeshi.ifrance.com/img/styles/collant-playboy.html collant playboy] [http://cincydj.ifrance.com/images/small/laura-morante/ laura morante nuda] [http://competitio.ifrance.com/calciatori-sex/ calciatori sex] [http://mi-kkiechang.ifrance.com/valentine-girl.html valentine girl] [http://mi-kkiechang.ifrance.com/ragazza-del.html ragazza del mese di playboy] [http://doctorpinkerton.ifrance.com/lib/porno-gays/ porno gays] [http://tulip123456.ifrance.com/topic/quella-porno.html quella porno erotica di mia moglie] [http://jnk713.ifrance.com/img/styles/foto-di/ foto di nudi maschili] [http://competitio.ifrance.com/george-town/ george town] [http://cincydj.ifrance.com/images/small/paola-giacometti/ paola giacometti] [http://end14april.ifrance.com/blog/www-donnenude.html www donnenude it] [http://elixirium.ifrance.com/lib/bisex-torino.html bisex torino] [http://competitio.ifrance.com/transexual-mundo/ transexual mundo] [http://bakadeshi.ifrance.com/img/styles/piacere-anale.html piacere anale] [http://bakadeshi.ifrance.com/img/styles/videoscaseros.html videoscaseros] [http://cincydj.ifrance.com/images/small/foto-di/ foto di donne nude] [http://cincydj.ifrance.com/images/small/daniela-la/ daniela la casa delle play girls] [http://competitio.ifrance.com/george-sults/ george sults] [http://spirit-psyki.ifrance.com/lib/selen-porno.html selen porno star] [http://mi-kkiechang.ifrance.com/sexy-foto.html sexy foto di laura antonelli] [http://adrienneee.ifrance.com/blog/foto-sexy/ foto sexy federica ridolfi] [http://mi-kkiechang.ifrance.com/postales-playboy.html postales playboy gratis] [http://tulip123456.ifrance.com/topic/donne-vecchie.html donne vecchie sborrano] [http://adrienneee.ifrance.com/blog/tim-sms/ tim sms gratis] [http://furrysoap.ifrance.com/analisti-programmatori/ analisti programmatori microsoft (regione lombardia - milano provincia)] [http://doctorpinkerton.ifrance.com/lib/hotel-iberostar/ hotel iberostar averroes] [http://adrienneee.ifrance.com/blog/ragazze-webcam/ ragazze webcam] [http://mi-kkiechang.ifrance.com/gallery-sesso.html gallery sesso] [http://furrysoap.ifrance.com/sexy-bar/ sexy bar donne] [http://furrysoap.ifrance.com/contatore-accesso/ contatore accesso gratis] [http://competitio.ifrance.com/dunning-george/ dunning, george] [http://mi-kkiechang.ifrance.com/sexoduro.html sexoduro] [http://doctorpinkerton.ifrance.com/lib/escort-girl/ escort girl parigi] [http://furrysoap.ifrance.com/donne-/ donne  singole] [http://jnk713.ifrance.com/img/styles/canali-digitali/ canali digitali terrestri] [http://mi-kkiechang.ifrance.com/foto-di.html foto di sesso tra madre e figlio] [http://jnk713.ifrance.com/img/styles/eres-todopoderoso/ eres todopoderoso] [http://tulip123456.ifrance.com/topic/www-pornomotore.html www pornomotore it] [http://bakadeshi.ifrance.com/img/styles/sexe.html sexe] [http://spirit-psyki.ifrance.com/lib/xxx-women.html xxx women xxx vree] [http://jnk713.ifrance.com/img/styles/porno-gratis/ porno gratis teen ager] [http://bakadeshi.ifrance.com/img/styles/sexy-manga.html sexy manga] [http://bakadeshi.ifrance.com/img/styles/quick-time.html quick time gratis] [http://end14april.ifrance.com/blog/donne-mature.html donne mature anziane troie] [http://spirit-psyki.ifrance.com/lib/donne-e.html donne e animali] [http://bakadeshi.ifrance.com/img/styles/tutto-piedi.html tutto piedi gratis foto] [http://doctorpinkerton.ifrance.com/lib/donne-pelose/ donne pelose] [http://tulip123456.ifrance.com/topic/www-sesso.html www sesso i] [http://bakadeshi.ifrance.com/img/styles/foto-anal.html foto anal] [http://bakadeshi.ifrance.com/img/styles/porno-poker.html porno poker] [http://elixirium.ifrance.com/lib/transessuali-da.html transessuali da contattare] [http://elixirium.ifrance.com/lib/ragazze-treviso.html ragazze treviso] [http://elixirium.ifrance.com/lib/disponibile-system.html disponibile system analyser] [http://jnk713.ifrance.com/img/styles/sesso-coppia/ sesso coppia] [http://bakadeshi.ifrance.com/img/styles/michel-vieth.html michel vieth videos porno] [http://furrysoap.ifrance.com/sito-donne/ sito donne pelose] [http://end14april.ifrance.com/blog/gallery-porno.html gallery porno] [http://cincydj.ifrance.com/images/small/britney-gratis/ britney gratis] [http://tulip123456.ifrance.com/topic/fotogallerie-gratis.html fotogallerie gratis] [http://spirit-psyki.ifrance.com/lib/www-temagay.html www temagay com] [http://competitio.ifrance.com/gay-nero/ gay nero] [http://cincydj.ifrance.com/images/small/video-roxana/ video roxana diaz porno] [http://spirit-psyki.ifrance.com/lib/notizie-donne.html notizie donne rapite] [http://spirit-psyki.ifrance.com/lib/www-veronica.html www veronica zemanova it] [http://adrienneee.ifrance.com/blog/giochi-carte/ giochi carte gratis] [http://elixirium.ifrance.com/lib/le-ragazze.html le ragazze di barcellona] [http://furrysoap.ifrance.com/racconti-di/ racconti di donne inculate] [http://furrysoap.ifrance.com/fuck-it/ fuck it testo] [http://bakadeshi.ifrance.com/img/styles/foto-transessuali.html foto transessuali] [http://mi-kkiechang.ifrance.com/paola-turci.html paola turci] [http://end14april.ifrance.com/blog/gallerie-.html gallerie 100 gratis] [http://tulip123456.ifrance.com/topic/xxx-free.html xxx free porn] [http://tulip123456.ifrance.com/topic/immagini-orge.html immagini orge] [http://bakadeshi.ifrance.com/img/styles/free-sex.html free sex xxx] [http://cincydj.ifrance.com/images/small/vido-gratis/ vido gratis] [http://spirit-psyki.ifrance.com/lib/michael-george.html michael george] [http://end14april.ifrance.com/blog/edengay.html edengay] [http://mi-kkiechang.ifrance.com/material-girl.html material girl] [http://end14april.ifrance.com/blog/donne-seni.html donne seni rifatti] [http://doctorpinkerton.ifrance.com/lib/transessuali-con/ transessuali con tel. per contatto] [http://furrysoap.ifrance.com/siti-bisex/ siti bisex] [http://bakadeshi.ifrance.com/img/styles/sfondi-per.html sfondi per desktop gratis] [http://doctorpinkerton.ifrance.com/lib/girlteen/ girlteen] [http://elixirium.ifrance.com/lib/annunci-bisex.html annunci bisex con telefono in puglia] [http://cincydj.ifrance.com/images/small/annunci-/ annunci  di sesso in sardegna] [http://adrienneee.ifrance.com/blog/donne-famose/ donne famose in perizoma] [http://tulip123456.ifrance.com/topic/foto-alessandra.html foto alessandra di uomini e donne] [http://cincydj.ifrance.com/images/small/locali-gay/ locali gay sorrento] [http://cincydj.ifrance.com/images/small/porno-sex/ porno sex cz] [http://elixirium.ifrance.com/lib/foto-sexy.html foto sexy la fattoria] [http://cincydj.ifrance.com/images/small/tata-young/ tata young sexy] [http://mi-kkiechang.ifrance.com/gratis-sex.html gratis sex] [http://bakadeshi.ifrance.com/img/styles/culturiste-sexi.html culturiste sexi] [http://doctorpinkerton.ifrance.com/lib/playboy-nude/ playboy nude pic] [http://jnk713.ifrance.com/img/styles/spice-girls/ spice girls holler] [http://cincydj.ifrance.com/images/small/tatoo-gratis/ tatoo gratis] [http://competitio.ifrance.com/deep-anal/ deep anal] [http://cincydj.ifrance.com/images/small/elio-e/ elio e le storie tese gratis] [http://tulip123456.ifrance.com/topic/uomini-palestrati.html uomini palestrati nudi] [http://mi-kkiechang.ifrance.com/loewe-spheros.html loewe spheros 37] [http://bakadeshi.ifrance.com/img/styles/donne-vestite.html donne vestite in mini gonna] [http://furrysoap.ifrance.com/foto-porno/ foto porno sesso bizzarro] [http://mi-kkiechang.ifrance.com/katie-jordan.html katie jordan price nuda foto] [http://end14april.ifrance.com/blog/racconti-erotici.html racconti erotici sesso con animali] [http://mi-kkiechang.ifrance.com/audioanalogue-maestro.html audio-analogue maestro] [http://competitio.ifrance.com/prince-cinnamon/ prince cinnamon girl] [http://jnk713.ifrance.com/img/styles/vip-maschi/ vip maschi nudi] [http://cincydj.ifrance.com/images/small/chat-libere/ chat libere gratis] [http://cincydj.ifrance.com/images/small/elisabetta-gardini/ elisabetta gardini nuda] [http://furrysoap.ifrance.com/bisex-dotato/ bisex dotato] [http://elixirium.ifrance.com/lib/www-porno.html www porno ru] [http://tulip123456.ifrance.com/topic/done-sexi.html done sexi] [http://elixirium.ifrance.com/lib/audio-analogue.html audio analogue puccini] [http://end14april.ifrance.com/blog/frankee-fuck.html frankee fuck back] [http://furrysoap.ifrance.com/lucas-george/ lucas, george] [http://adrienneee.ifrance.com/blog/porno-web/ porno web] [http://furrysoap.ifrance.com/hentai-giochi/ hentai giochi] [http://adrienneee.ifrance.com/blog/xxx/ xxx66] [http://spirit-psyki.ifrance.com/lib/severina-free.html severina free pornofilm] [http://bakadeshi.ifrance.com/img/styles/sistemi-di.html sistemi di controllo analisi economiche] [http://adrienneee.ifrance.com/blog/softcam-key/ softcam key canal] [http://doctorpinkerton.ifrance.com/lib/fukingmachines-gratis/ fukingmachines gratis] [http://spirit-psyki.ifrance.com/lib/traduzione-della.html traduzione della canzone fuck it] [http://furrysoap.ifrance.com/www-donnemature/ www donnemature gratis] [http://end14april.ifrance.com/blog/www-sexso.html www sexso caliente] [http://spirit-psyki.ifrance.com/lib/sexxx.html sexxx] [http://end14april.ifrance.com/blog/eros-sesso.html eros sesso] [http://mi-kkiechang.ifrance.com/freepornostar.html freepornostar] [http://tulip123456.ifrance.com/topic/sex-links.html sex links] [http://jnk713.ifrance.com/img/styles/donne/ donne] [http://tulip123456.ifrance.com/topic/reamon-supergirl.html reamon supergirl] [http://bakadeshi.ifrance.com/img/styles/gorgeus.html gorgeus] [http://adrienneee.ifrance.com/blog/fuck-it/ fuck it i dont t want you back] [http://bakadeshi.ifrance.com/img/styles/gaynor-janet.html gaynor, janet] [http://elixirium.ifrance.com/lib/porno-foto.html porno foto britney spears] [http://mi-kkiechang.ifrance.com/fotos-da.html fotos da playboy internacional] [http://bakadeshi.ifrance.com/img/styles/cinzia-profita.html cinzia profita nuda] [http://doctorpinkerton.ifrance.com/lib/paola-maugeri/ paola maugeri] [http://bakadeshi.ifrance.com/img/styles/donne-in.html donne in cerca di avventure sessuali] [http://furrysoap.ifrance.com/sesso-tantrico/ sesso tantrico] [http://cincydj.ifrance.com/images/small/blondie-porno/ blondie porno star] [http://mi-kkiechang.ifrance.com/gay-annunci.html gay annunci telefonici] [http://adrienneee.ifrance.com/blog/gay-desnudo/ gay desnudo] [http://jnk713.ifrance.com/img/styles/gif-sex/ gif sex] [http://spirit-psyki.ifrance.com/lib/canali-televisivi.html canali televisivi] [http://adrienneee.ifrance.com/blog/singola-matura/ singola matura in cerca di sesso] [http://end14april.ifrance.com/blog/video-teen.html video teen sesso] [http://bakadeshi.ifrance.com/img/styles/fotos-de.html fotos de modelos desnuda] [http://mi-kkiechang.ifrance.com/deportistas-desnudos.html deportistas desnudos] [http://adrienneee.ifrance.com/blog/racconti-incestuosi/ racconti incestuosi da leggere gratis] [http://bakadeshi.ifrance.com/img/styles/robbie-williams.html robbie williams. sexed up] [http://doctorpinkerton.ifrance.com/lib/videos-gratis/ videos gratis] [http://jnk713.ifrance.com/img/styles/gstring-sexy/ gstring sexy] [http://jnk713.ifrance.com/img/styles/ranma-porno/ ranma porno] [http://jnk713.ifrance.com/img/styles/foto-donne/ foto donne nudiste mare] [http://elixirium.ifrance.com/lib/amplificatore-audio.html amplificatore audio analogue se remote] [http://cincydj.ifrance.com/images/small/immagine-porno/ immagine porno] [http://jnk713.ifrance.com/img/styles/spice-girls/ spice girls 2 become one] [http://adrienneee.ifrance.com/blog/sito-inviare/ sito inviare sms gratis] [http://mi-kkiechang.ifrance.com/mplayerosx.html mplayerosx 2] [http://mi-kkiechang.ifrance.com/paola-barale.html paola barale sexy] [http://mi-kkiechang.ifrance.com/foto-sexy.html foto sexy fanni cadeo] [http://bakadeshi.ifrance.com/img/styles/nudo-femminile.html nudo femminile] [http://adrienneee.ifrance.com/blog/tradimenti-di/ tradimenti di donne troie] [http://mi-kkiechang.ifrance.com/foto-sexy.html foto sexy eva robin s] [http://doctorpinkerton.ifrance.com/lib/video-porno/ video porno mature] [http://mi-kkiechang.ifrance.com/video-porno.html video porno voyeur] [http://competitio.ifrance.com/big-xxx/ big xxx movis com] [http://adrienneee.ifrance.com/blog/fotogay/ fotogay] [http://end14april.ifrance.com/blog/mp-gratis.html mp3 gratis de andre] [http://elixirium.ifrance.com/lib/fotos-demujeres.html fotos demujeres desnudas gratis] [http://elixirium.ifrance.com/lib/calci-da.html calci da donne pericolose] [http://end14april.ifrance.com/blog/pornostar-del.html pornostar del momento] [http://adrienneee.ifrance.com/blog/naked-tv/ naked tv] [http://doctorpinkerton.ifrance.com/lib/ridigratis-it/ ridigratis it] [http://jnk713.ifrance.com/img/styles/giochi-sexi/ giochi sexi gratis] [http://jnk713.ifrance.com/img/styles/www-sfondi/ www sfondi nudi it] [http://jnk713.ifrance.com/img/styles/escort-girl/ escort girl] [http://furrysoap.ifrance.com/video-xxx/ video xxx de michel vieth] [http://cincydj.ifrance.com/images/small/esenas-gratis/ esenas gratis] [http://jnk713.ifrance.com/img/styles/rumori-per/ rumori per cellulari gratis] [http://competitio.ifrance.com/ragazze-sole/ ragazze sole] [http://elixirium.ifrance.com/lib/foto-fisico.html foto fisico ragazzi giovani gay] [http://tulip123456.ifrance.com/topic/sfondi-erotici.html sfondi erotici] [http://competitio.ifrance.com/kylie-video/ kylie video sexy] [http://mi-kkiechang.ifrance.com/gratis-g.html gratis g grasse obese] [http://furrysoap.ifrance.com/juegos-gratis/ juegos gratis de telefonica movil] [http://doctorpinkerton.ifrance.com/lib/donne-cercasi/ donne cercasi] [http://mi-kkiechang.ifrance.com/paola-perego.html paola perego nuda] [http://cincydj.ifrance.com/images/small/porno-riviste/ porno riviste] [http://doctorpinkerton.ifrance.com/lib/canal-once/ canal once] [http://end14april.ifrance.com/blog/ssxxx.html ssxxx] [http://doctorpinkerton.ifrance.com/lib/email-gratis/ email gratis] [http://jnk713.ifrance.com/img/styles/double-fuck/ double fuck] [http://bakadeshi.ifrance.com/img/styles/travel-girl.html travel girl] [http://mi-kkiechang.ifrance.com/professoresse-sexy.html professoresse sexy] [http://tulip123456.ifrance.com/topic/jenniferlopez-sexy.html jenniferlopez sexy nude pic] [http://adrienneee.ifrance.com/blog/di-fare/ di fare sesso] {| align=right
+
{| align=right
 
|-
 
|-
 
|  
 
|  
Line 17: Line 17:
 
[[Image:PG31-USB-Connection.jpg|PG31 USB Connection]]
 
[[Image:PG31-USB-Connection.jpg|PG31 USB Connection]]
  
The USB connector has four pins : Vcc (*around* 5V), GND, D , D-. Tying these four connections to the CP2102 is easy enough.
+
The USB connector has four pins : Vcc (*around* 5V), GND, D+, D-. Tying these four connections to the CP2102 is easy enough.
  
 
[[Image:PG31-USB-Connection-Schematic.jpg]]
 
[[Image:PG31-USB-Connection-Schematic.jpg]]

Revision as of 20:47, 30 August 2007

PG31 USB Dev Board

Description:
You've probably heard about the CP210x USB ICs from Silicon Labs, now here's an application that uses it. The CP2102 gives us 3V TTL to a VCP (virtual comm port) over USB as well as generating the 3.3V needed for the board.

In this project we demonstrate how to:

  • Setup a USB to Serial link
  • Use the CP2102 for 3.3V
  • Use a SMD 12mm battery holder

Contents

USB Connection

The CP2102 USB IC is fairly easy to use once you've plugged it down a couple times.

PG31 USB Connection

The USB connector has four pins : Vcc (*around* 5V), GND, D+, D-. Tying these four connections to the CP2102 is easy enough.

PG31-USB-Connection-Schematic.jpg

There are a couple things to note. In this setup, we do not have any ESD protection or surge supression. We are quite possibly violating some USB standards. But does it work? Yep.

When you configure the CP2102 this way, it can source up to 100mA at 3.3V using its internal voltage regulator. This is perfect for our application as the PG31 needs ~40mA at 3.3V.

Note the TX pin on the CP2102 is an output and needs to be connected to the RX pin on the PG31. This screwed me up a few times.

The CP2102 has built-in cystal and eeprom. These means you need very few external components to get it working. You can even program in your own ID string so when you plug it onto your computer, it comes up with the name of your widget!

When the CP210x is attached to a computer (and it's soldered correctly) you will see windows hardware wizard request drivers. These drivers can be downloaded from SI Labs. You can also create your own signature drivers using some SI Labs software.

You can also program the internal EEPROM to reflect your own product ID and serial strings. This software is from SI Labs as well but I forget were - when someone finds it, post it here.

Once the drivers are installed, the CP210x will turn into a serial com port! Yes! It's weird to think about until you see it happen. So this USB dev board now acts like a com port on my computer. All I have to do is pass characters in and out COM 5 (for example) and I can do things over USB! No messy drivers, no protocols to think about, it's all done in the IC. All right!

One thing to note when you are using the CP210x ICs, the Linux community may scoff. SI Labs did a great job with the windows support, but a piss-poor job of opening the drivers for the open-source community. I'm not really a Linux person so it didn't effect me. But if your app needs linux connectivity, you may want to take a quick look for other potential ICs. Last I heard, there was good Linux support for the CP2102, but there was nothing for the CP2103 GPIO control...

One last con : The ICs come in QFN leadless package only. YES it can be soldered by hand, but you'll need some experience and/or some good hot-air soldering tools. I taught myself how to rework stuff using this IC. You really can't destroy it, but you can certainly delaminate (kill) the PCB if you heat it for excessive amounts of time. Don't 'not' create a PCB or a design because of silly SMD parts. They're not that hard to solder!


Battery Backup

12mm coin cell holder

If you're playing with GPS, you've got to have a battery backup. The 12mm coin cell lithium allows the PG31 (and many other GPS receivers) to retain the alamanac data. This small battery provides just enough juice for 3-5 years. By having alamanac data at power on, the GPS receiver will be able to do a warm lock instead of a cold lock. Cold locks take 1-2 minutes, warm locks, as little as 30 seconds. The alamanac data, in effect, allows the GPS receiver to 'guess' where it is in the world ("Last time I was on I was in Ohio, therefor, I will assume I'm near there").

If you're unfamiliar with Lithium Coin Cells - they come in a couple different sizes. I prefer 12mm just cause it's small but beefy enough to do most of the BBR (battery backed ram) that we need to support. The battery itself has a postive top (noted by the plus) and a ground on the bottom. You normally create a pad on the PCB for the ground and the coin cell holder is positive. We've learned the hard way that the bottom part of the cell is sometimes concave. This means that when you slide the coin cell onto the board, the concave ground part of the cell may not contact the PCB pad very well. If you're using a paste stencil, just leave a cutout for this pad. The extra paste will add 5-10 mils of solder to the pad. If you're solder the thing by hand, add a little blob of solder to this ground pad to give it some height. When you insert the battery, it should ride nicely on top of the ground pad blob.


PG31 Footprint

PG31-Footprint.jpg

Now about the footprint for the PG31. Unless the manufacturer hands you a foorprint file or a simple, recommended FP in the datasheet, you're going to have to go it on your own. We took the PG31 and a pair of calipers and went at it. It can be extremely difficult the first time. This PG31 FP took me twice to get correct. Do the best you can and try to account for things like the antenna connector. The second rev FP, I forgot to account for the MMCX connector, I put the DB9 connector right up against the PG31, and Viola - useless PCB! a.k.a another coaster for my coffee cup. But once you've got the FP, you're good for all future projects using that device. Now you know when engs hate to change parts...


Final Layout

PG31-USB-Layout.jpg

You can see the PCB layout is pretty straight forward. The 'solder jumpers' are a feature that SFE came up with to minimize our manufacturing time while allowing end users to populate the physical jumpers if they needed the ability to connect/disconnect a feature often and quickly. Most users just plug the PG31 onto their computer for quick evaluation. At some point, the CP2102 IC may need to be disconnected from the circuit so that an external micro or embedded system could be attached. If this is done back and forth often, the end user can clear the solder jumper with a swipe of the soldering iron, install a 2-pin header and a black plastic jumper. This now allows them to jumper/dejumper quickly and keeps us from having to solder the 2-pin headers into a board that may not need them.


Things to Improve

So that's pretty much it. The board works well, and assuming Laipac doesn't change their parts again, we will produce the board for some time.

We may consider migrating to a different USB IC someday but the CP2102 continues to be a really simple to use USB to UART IC.


Documents

PG31 USB Schematic

PG31-USB Protel File

PG31-USB Gerber Files

Footprints:
SFE Footprint Library

FP Name: PG31

Supplier Info:
Spark Fun Electronics part # : Eval-PG31-USB
Single Piece Price : $29.95

Related Items:

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox