PmodIA™ Reference Manual
E ntlafalitsoe ka la 15 Mmesa, 2016
Bukana ena e sebetsa ho PmodIA rev. A
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PmodIA ke tlhahlobo ea impedance e hahiloeng ho potoloha Analog Devices AD5933 12-bit Impedance Converter Network Analyzer.
Likarolo li kenyelletsa:
- Analyzer ea impedance e nang le 12-bit impedance converter
- Lekanya boleng ba ho sitisa ho tloha ho 100Ω ho isa ho 10 MΩ.
- Ho fiela khafetsa khafetsa
- Phaello e ka reroang ampmoqhobi
- Ho ikhethela ho hlahisa oache ea kantle
- PCB e nyane bakeng sa meralo e feto-fetohang 1.6 ho × 0.8 ho (4.1 cm × 2.0 cm)
- Boema-kepe ba 2×4-pin bo nang le I²C interface
- E latela Tlhaloso ea Digilent Interface
- Laebrari le mohlalaample khoutu e fumaneha setsing sa lisebelisoa
PmodiA.
Tlhaloso ea Ts'ebetso
PmodIA e sebelisa Analog Devices AD5933 le jenereithara ea eona ea on-board frequency le converter ea analog-to-digital (ADC) ho khona ho hlasimolla tšitiso e sa tsejoeng ea kantle ho maqhubu a tsebahalang. Leqhubu lena le tsebahalang le romelloa ka e 'ngoe ea lihokelo tsa SMA. Karabelo ea khafetsa e nkuoa ke sehokelo se seng sa SMA ebe se romelloa ho ADC mme phetoho e hlakileng ea Fourier transform (DFT) e etsoa ka s.ampdata e etelletsoeng pele, ho boloka likarolo tsa 'nete le tse inahaneloang tsa tharollo libukeng tsa data tsa on-chip. Boholo ba impedance e sa tsejoeng hammoho le mohato o lekanyelitsoeng oa ts'oaetso sebakeng se seng le se seng sa ho fiela khafetsa ho ka baloa ho tsoa mantsoeng ana a mabeli a data.
1.1 I² C Interface
PmodiA e sebetsa joalo ka sesebelisoa sa lekhoba se sebelisang protocol ea puisano ea I² C. I² C interface standard e sebelisa mela e 'meli ea matšoao. Tsena ke data ea I² C le oache ea I² C. Lits'oants'o tsena tsa 'mapa ho data ea serial (SDA) le serial clock (SCL) ka ho latellana ho PmodIA. (Sheba Letlapa la 1.) Litaelo tse latelang li hlalosa mokhoa oa ho bala le ho ngolla sesebelisoa.
U tlameha ho nahana ka liprothokholo tse peli ha u ngolla PmodIA: mongolo oa byte/command byte le block write. Ho ngola li-byte tse le 'ngoe ho tloha ho mong'a lekhoba ho hloka hore mong'a lona a qale boemo ba ho qala le ho romela aterese ea lekhoba la 7bit. U tlameha ho tšoara ho bala / ho ngola hanyane ho tlase ho ngolla sesebelisoa sa lekhoba ka katleho. PmodiA e lokela ho beha aterese ea lekhoba e le 0001101 (0x0D) ha e qala. Ka mor'a hore lekhoba le amohele aterese ea lona, mong'a lona o lokela ho romela aterese ea ngoliso eo le batlang ho e ngolla. Hang ha lekhoba le lumela ho fumana aterese ena, mong'a lona o tla romela data byte e le 'ngoe eo lekhoba le lokelang ho e amohela ka chelete ea ho khutlisa. Joale monghali o lokela ho fana ka boemo ba ho emisa.
U ka sebelisa protocol ena ho theha sesupo bakeng sa aterese ea ngoliso. Ka mor'a hore mong'a lekhoba a romele aterese ea lekhoba 'me a ngole hanyane,' me lekhoba le araba ka lengolo la tumello, mong'a lona o romela pointer command byte (10110000, kapa, 0xB0). Lekhoba le tla fana ka lengolo la tumello ebe mong'a lona o tla romela aterese ea ngoliso ho e supa mohopolong. Nakong e tlang ha sesebelisoa se bala kapa se ngola data ho rejisetara, se tla etsahala atereseng ena.
Hlokomela: Pointer e tlameha ho beoa pele o sebelisa li-protocol tsa block kapa block bala.
U ka etsa block write protocol ka mokhoa o ts'oanang ho beha pointer. Romela taelo ea ho ngola block (10100000, kapa, 0xA0) sebakeng sa taelo ea pointer, 'me palo ea li-byte tse rometsoeng (e emetsoeng e le li-byte) e tla nka sebaka sa aterese ea ngoliso ka li-byte tsa data tse latelang tse nang le zero indexed. Sebelisa li-protocol tse tšoanang ha u bala lintlha tse tsoang ho PmodiA: amohela li-byte le ho thibela ho bala.
| Sehokelo J1 – I² C Lipuisano | ||
| Pin | Letshwao | Tlhaloso |
| 1, 2 | SCL | I² C oache |
| 3, 4 | SDA | Lintlha tsa I² C |
| 5, 6 | GND | Sebaka sa phepelo ea motlakase |
| 7, 8 | VCC | Phepelo ea motlakase (3.3V/5V) |
1.2 Mohloli oa oache
PmodiA e na le oscillator e ka hare e hlahisang oache ea 16.776 MHz ho tsamaisa sesebelisoa. U ka sebelisa oache ea kantle ka ho kenya IC4 ho PmodiA le ho beha bit 3 bukeng ea taolo (ngolisa aterese 0x80 le 0x81).
Sekema sa PmodiA se fana ka lethathamo la li-oscillator tse khothalelitsoeng. Sekema se fumaneha leqepheng la sehlahisoa sa PmodiA ho www.digilentinc.com.
1.3 Ho theha Frequency Fiela
Pherekano ea motlakase, ?, ea potoloho e ka fapana ho latela mefuta e mengata ea maqhubu. PmodiA e u lumella ho theha sekhahla sa ho fiela habonolo ho fumana litšobotsi tsa ho se sebetse ha potoloho. Taba ea pele, o tlameha ho theha sebopeho sa I² C lipakeng tsa boto ea baeti le PmodiA. PmodiA e hloka lintlha tse tharo ho fiela khafetsa: ho qala khafetsa, palo ea mehato ea ho fiela, le ho eketseha ha makhetlo ka mor'a mohato ka mong. Maqhubu a ho qala le li-increment ka mohato o mong le o mong li bolokiloe e le mantsoe a 24-bit. Palo ea mehato ea parameter e bolokiloe e le lentsoe la 9-bit.
O ka khona ho hlophisa voltage ea maqhubu a tlhahiso ho fiela ka ho beha likotoana tsa 10 le 9 bukeng ea taolo. Tlhōrō ea sehlohlolong voltage hloka ho beoa ka nepo mabapi le tlhahlobo ea impedance. Sena ke ho qoba khetho ea ka hare-amps ho tsoa ho leka ho fana ka tlhahiso ea voltage kapa tse fetang matla a tsona. Ho kgothaletswa hore ha o sebedisa 20-ohm feedback resistor ho beha sehlohlolong hore se be sehlohlolongtage ho 200mV kapa 400mV mme ha o sebelisa 100K-ohm feedback resistor, beha tlhoro hore e be sehlohlolong.tagka 1V.
Hang ha potoloho e se e thabile, ho nka nako ho fihla boemong ba eona bo tsitsitseng. U ka hlophisa nako ea ho rarolla ntlha ka 'ngoe ho fiela khafetsa ka ho ngola boleng ba ho ngolisa liaterese 0x8A le 0x8B. Boleng bona bo emela palo ea linako tse hlahisoang ke analog-to-digital converter e tla iphapanyetsa pele e qala s.ampkarabelo khafetsa. (Sheba Lethathamo la 2 bakeng sa lethathamo la lirejisete le liparamente tse tsamaellanang le tsona.)
| Ngolisa Aterese | Paramethara |
| 0x80, 0x81 | Rejisetara ea taolo (Bit-10 le Bit-9 set peak-to-peak voltage bakeng sa maqhubu a tlhahiso). |
| 0x82, 0x83, 0x84 | Leqhubu la ho qala (Hz) |
| 0x85, 0x86, 0x87 | Keketseho ka mohato (Hz) |
| 0x88, 0x89 | Palo ea mehato ea ho fiela |
| 0x8A, 0x8B | Nako ea ho lokisa (Palo ea linako tse hlahisoang) |
U ka bala lentsoe la 24-bit leo u lokelang ho le boloka liatereseng tsa registara bakeng sa maqhubu a qalang le increment ka mohato o mong le o mong ka ho sebelisa khoutu ea ho qala le ho eketsa palo ea khoutu e ka tlase. U ka boela ua fumana li-equation tsena le lintlha tse ling ho AD5933 data sheet.
Hang ha u se u behile liparamente tsena, etsa mehato e latelang ho qala ho fiela khafetsa (e hlalositsoe ho tsoa leqepheng la data la AD5933):
- Kenya mokhoa oa standby ka ho romela taelo ea standby ho rejisetara ea taolo.
- Kenya mokhoa oa ho qala ka ho romela taelo e nang le "start frequency command" ho rejisetara ea taolo.
Sena se lumella potoloho e lekantsoeng hore e fihle boemong ba eona bo tsitsitseng. - Qala ho fiela khafetsa ka ho romella taelo ea ho fiela khafetsa ho registara ea taolo.
1.4 Lipalo tsa Impedans
Analog-to-digital converter sampe fokotsa karabelo ea khafetsa ho tsoa ho litšitiso tse sa tsejoeng ho fihla ho 1MSPS ka qeto ea 12-bit bakeng sa ntlha e 'ngoe le e 'ngoe ea ho fiela khafetsa. Pele ho boloka litekanyo, PmodIA e etsa Discrete Fourier Transform (DFT) ho s.ampdata e etelletsoeng pele (1,024 samplets bakeng sa mohato o mong le o mong oa maqhubu). Lirejisetara tse peli li boloka sephetho sa DFT: Registeri ea 'Nete, le Ngoliso ea Maikutlo.
Impedans ea motlakase e na le linomoro tsa 'nete le tse inahaneloang. Ka mokhoa oa Cartesian, o ka hlalosa ho se lumellane le equation:
z = 'Nete + j ∗Ea inahaneloang
Moo 'Nete e leng karolo ea sebele, Monahano ke karolo e inahaneloang, le? ke nomoro e inahaneloang (e lekanang le i = √−1, ka lipalo). U ka boela ua emela impedance ka mokhoa oa polar:
Tšitiso = |z|∠θ
Hokae |Z| ke boholo mme ∠θ ke angle ea mohato:
PmodiA ha e etse lipalo. Ka mor'a DFT e 'ngoe le e' ngoe, sesebelisoa se hloahloa se tlameha ho bala litekanyetso ho lirejisetara tsa 'Nete le tsa Maikutlo.
E le ho bala impedance ea 'nete, u tlameha ho ela hloko phaello. U ka fumana example fumana lintlha tsa lipalo ho AD9533 data sheet.
1.5 Litemoso tsa Mocheso
PmodiA e na le sensor e ikemetseng, ea 13-bit ho lekola mocheso oa sesebelisoa. Ka kopo, sheba leqephe la data la AD5933 bakeng sa lintlha tse ling mabapi le ho laola mojule ona.
1.6 Ngolisa liaterese
Leqephe la data la AD5933 le na le lethathamo le felletseng la liaterese tsa ngoliso.
Litekanyo tsa 'Mele
Lithakhisa tsa hlooho ea phini li arohane ka 100 mil. PCB e bolelele ba lisenthimithara tse 1.6 ka mahlakoreng a bapileng le lithakhisa tsa hlooho ea phini le bolelele ba lisenthimithara tse 0.8 mahlakoreng a pota-potileng hlooho ea phini.
E jarollotsoe ho tsoa Arrow.com.
Copyright Digilent, Inc. Litokelo tsohle li sirelelitsoe.
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Litokomane / Lisebelisoa
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DIGILENT PmodIA Ka Liboto tsa Kantle tsa Clock Microcontroller [pdf] Bukana ea Mosebelisi PmodIA E Nang le Liboto tsa Kantle tsa Clock Microcontroller, PmodIA, Ka Liboto tsa Kantle tsa Clock Microcontroller, Liboto tsa Kantle tsa Clock Microcontroller, Liboto tsa Clock Microcontroller, Liboto tsa Microcontroller, Liboto. |