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    <div class="moz-cite-prefix">Taky jsem ho pouzival ,ted pouzivam
      LT8611 umoznuje v pripade potreby i dobijet napajeci baterku<br>
      Fanda<br>
      <br>
      Dne 17.9.2014 9:36, Ondřej Kozumplík napsal(a):<br>
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cite="mid:CAN2ox7Fai8cLEOBTOANdue0_=gRDJ=x6kkUX4pekdDcbD4d+Ww@mail.gmail.com"
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        <div>mne se osvedcil na napajeni GSMka treba <a
            moz-do-not-send="true"
            href="http://www.linear.com/product/LT3480">http://www.linear.com/product/LT3480</a>
          <br>
          <br>
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        je to Linear, takze cena je vyssi, ale pokud je dulezita
        spotreba, tak se to vyplati. Provozuju ho na cca 650kHz. Je to
        dobry kompromis soucastek, narocnosti layoutu a zkrotitelnosti
        EMI.<br>
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            <br>
            <div class="gmail_extra"><br clear="all">
              <div>Ataman<br>
                <a moz-do-not-send="true"
                  href="http://www.hysteria-metal.cz" target="_blank">http://www.hysteria-metal.cz</a><span
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              <br>
              <div class="gmail_quote">Dne 16. září 2014 14:49 "Ing.
                Libor Konečný" <span dir="ltr"><<a
                    moz-do-not-send="true"
                    href="mailto:support@mikrovlny.cz" target="_blank">support@mikrovlny.cz</a>></span>
                napsal(a):<br>
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                  <div text="#000000" bgcolor="#FFFFFF"> Zdravim<br>
                    jen jsem zbezne zkouknul.<br>
                    Urcite bych doporucoval vyvest STATUS pin pro
                    priadne dalsi vyuziti MCU.<br>
                    Dle neho okamzite zjistite zda je modul ONLINE.<br>
                    <br>
                    LK<br>
                    <br>
                    <br>
                    <div>Dne 16.9.2014 14:31, <a moz-do-not-send="true"
                        href="mailto:Razak.N@seznam.cz" target="_blank">Razak.N@seznam.cz</a>
                      napsal(a):<br>
                    </div>
                    <blockquote type="cite">
                      <div>
                        <div class="h5">V mem vlaknu o Alarmu padla
                          zminka o GSM brane/modemu.<br>
                          Zde je pokus o vlastni reseni, ktere
                          zohlednuje vse co mi chybelo u ruznych
                          cinskych udelatek.<br>
                          - kompaktni design s moznosti "prisroubovat"<br>
                          - signaly vyvedeny na jedne konektor<br>
                          - slusna ucinnost zdroje<br>
                          - RI<br>
                          - push-push SIM slot<br>
                          <br>
                          Zatim to neni uplne dotazene, rikejme tomu
                          alfa verze po cca cca 4 hodinach prace.<br>
                          Treba by nekdo z konference takovou vec uzil
                          nebo prispel napadem co udelat jinak/lepe.<br>
                          <br>
                          Velikost DPS 50mm x 50mm , orientační cena
                          Bomu <600Kc, samotný SIM900 cca 300Kc<br>
                          <a moz-do-not-send="true"
                            href="http://i.imgur.com/5ori65l.png"
                            target="_blank">http://i.imgur.com/5ori65l.png</a><br>
                          <a moz-do-not-send="true"
                            href="http://i.imgur.com/pHYahbq.png"
                            target="_blank">http://i.imgur.com/pHYahbq.png</a><br>
                          <br>
                          Popis<br>
                          <br>
                          Zdroj<br>
                          GSM komunikacni zarizeni maji dve
                          vlastnosti,jsou zpravidla delana pro napajeni
                          z baterie (3,7V) a i pres pomerne malou
                          spotrebu vykazuji znacne <br>
                          spicky pri odberu (az 2A).<br>
                          Konkretne SIM900 vyzaduje <br>
                          - napajeni 3,2-4.8V<br>
                          - v rezimu spanku odebira cca 1mA<br>
                          - v idle 22mA<br>
                          - pri prenosu dat podle modu 75-250mA s tim ze
                          pri vysilani se v odberu objevuji cca 600us
                          spicky 2A a to kazde cca 4ms<br>
                          <br>
                          Zdroj tedy musi byt dostatecne tvrdy, aby
                          ustal odber 2A a dostatecne ucinny, aby v idle
                          nebo sleep neprozral chalupu<br>
                          Me reseni vychazi z pouziti Constant On-time
                          Step-Down menice LM25011 <br>
                          -Vin 6-25V menic sam umi 6-45V , omezeni je
                          dano odlnocti keramickych C na vstupu 25V.<br>
                          - Spinaci f>300kHz<br>
                          Predpokladana ucinnost<br>
                          - ucinnost Vin 12V Iout     2A cca 84%<br>
                          - ucinnost Vin 12V Iout  200mA cca 86%<br>
                          - ucinnost Vin 12V Iout   22mA cca 61%<br>
                          - ucinnost Vin 12V Iout    1mA cca  8%<br>
                          <br>
                          Kvuli tragicke ucinnosti v sleep modu jsem
                          vyvedl signal umoznujici zdroj vypnout a cely
                          modem odstavit, bohuzel pri zapnuti to cele
                          bude bootovat a registrovat se.<br>
                          Reseni by mohlo byt pouziti nejakeho driveru,
                          ktery umi vynechavat pulsy a snizavat spinaci
                          ztraty, napada me TPS54240, ale asi by to
                          nebylo o mnoho lepsi.<br>
                          <br>
                          Komunikacni rozhrani.<br>
                          SIM900 pracuje interne s napajecim napetim
                          2.8V a vstupy maji oficialni odolnost 3V,
                          cinanin na to dlabou a v 3.3V logice tuto
                          pripojuji primo.<br>
                          Nechtel jsem byt dobytek + zajistit moznost
                          pouziti s 5V logikou a tak je rozhrani
                          oddeleno TXB0106, 6x obousmerny Level
                          translator.<br>
                          Na konektor je vyveden <br>
                          - USART pro komunikaci s SIM900,<br>
                          - DTR, kterym lze hardwarove modem uspat<br>
                          - RI signal kterym SIM900 rika, ze prisla SMS,
                          hovor nebo doslo k URC<br>
                          - Reset, lze pres nej provest hw reset modemu
                          pokud neodpovida<br>
                          - PowerDown , lze jim vypnout spinany zdroj a
                          cely modem odstavit<br>
                          - GPIO2,3 volne pouzitelne I/O  z SIM900 <br>
                          <br>
                          Mikrofon, Repro<br>
                          SIM900 ma vyvedny tyto vstupy,mohlo vy se to
                          hodit pro pokecani se zlodeji, online
                          odposlechu atd.<br>
                          Mic vstup je defakto v doporucenem zapojeni. <br>
                          Skp jsem posilil a oddelil 2.65W mono
                          zesilovacem pracujcim v tride D s tim, ze
                          zesileni je nastaveno na +6bB, lze zmeni
                          zmenou odporu. <br>
                          Zesilovac ma Shutdown, kterym lze zesilovac
                          odstavi (spotreba v radu nA), vystup je
                          ovladan jednim z vystupu SIM900 a tak lze
                          zesilovac vypnout/zapnout pomoci AT prikazu.<br>
                          <br>
                          <br>
                          vystup na 50 ohm GSN antenu , SMA konektor.<br>
                          Slot na SIM zasouvaci push-push verze<br>
                          Net+ Stat LED - indikuje zda je SIM900 zapnut,
                          registrovan v siti , probiha GPRS prenos<br>
                          vse v doporucenem zapojeni<br>
                          <br>
                          Hmotove usporadani viz obr. ale jak rikam neni
                          to zcela dodelane <br>
                          <br>
                          Nevim zda je zde zvykam zverejnovat vlastni
                          vyplody, ale snad se najde nekdo koho to
                          zajina, pripoji se radou, ci poznamkou.<br>
                          Pripadne nekdo projevi zajem pripojit k
                          objednavce soucastek/DPS, ono je postovne na
                          jeden i 5 SIM900 stejne, o DPS nemluve.<br>
                          <br>
                          Razak<br>
                          <br>
                          <br>
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