Akwụkwọ ntuziaka PmodIA™
Emegharịrị Eprel 15, 2016
Akwụkwọ ntuziaka a na-emetụta PmodIA rev. A
gafereview
PmodIA bụ ihe nyocha impedance wuru gburugburu Ngwaọrụ Analog AD5933 12-bit Impedance Converter Network Analyzer.
Atụmatụ gụnyere:
- Ihe nyocha impedance nwere ihe ngbanwe impedance 12-bit
- Tụọ ụkpụrụ impedance sitere na 100Ω ruo 10 MΩ.
- Mkpochapụ ugboro mmemme nwere ike ime
- uru mmemme ampna -emegharị ihe
- Ọgbọ elekere mpụga nhọrọ
- Obere PCB maka atụmatụ mgbanwe 1.6 na × 0.8 inch (4.1 cm × 2.0 cm)
- 2 × 4-pin ọdụ ụgbọ mmiri nwere interface I²C
- Na-agbaso nkọwapụta interface Digilenti
- Ọbá akwụkwọ na example koodu dị na resource center
PmodIA.
Nkọwa ọrụ
PmodIA na-eji Ngwaọrụ Analog AD5933 ya na onye na-emepụta ihe ugboro ugboro ya na ihe ntụgharị analọg na-dijitalụ (ADC) iji nwee ike kpalite ihe mgbochi amaghi ama mpụga n'oge ama ama. A na-eziga ugboro a amaara site na otu njikọ SMA. A na-ejide nzaghachi ugboro ugboro site na njikọ SMA ọzọ wee ziga ya na ADC ma na-eme mgbanwe pụrụ iche Fourier (DFT) na s.ampeduzi data, na-echekwa ezigbo na nke a pụrụ ichetụ n'echiche nke ngwọta na ndekọ data on-chip. Enwere ike gbakọọ ịdị ukwuu nke impedance na-amaghị yana yana usoro ikwu nke impedance n'oge ọ bụla na-ekpochapụ ugboro ugboro site na okwu data abụọ a.
1.1 I² C interface
PmodIA na-arụ ọrụ dị ka ngwaọrụ ohu na-eji usoro nkwukọrịta I² C. Ọkọlọtọ interface I² C na-eji ahịrị mgbama abụọ. Ndị a bụ data I² C na elekere I² C. Ihe nrịbama ndị a na-akọwapụta data serial (SDA) na elekere serial (SCL) n'otu n'otu na PmodIA. (Lee Isiokwu 1.) Ntuziaka na-esonụ na-akọwa otú e si agụ na ide na ngwaọrụ.
Ị ga-atụlerịrị usoro iwu abụọ mgbe ị na-edegara PmodIA: byte/iwu byte na ihe mgbochi dee. Ide otu byte site na nna ukwu nye ohu chọrọ onye nwe ya ka ọ malite ọnọdụ mmalite wee zipụ adreesị ohu 7bit. Ị ga-ejiderịrị agụ / dee ntakịrị ka ịdegara ngwaọrụ ohu ahụ nke ọma. PmodIA kwesịrị ịtọ adreesị ohu dị ka 0001101 (0x0D) na mmalite. Mgbe ohu ahụ kwupụtachara adres ya, nna ya ukwu aghaghị izigara ya adres nke akwụkwọ ndekọ aha ọ chọrọ idegara ya. Ozugbo ohu ahụ kwetara na ọ natara adreesị a, nna ya ukwu ga-ezite otu byte data nke ohu ahụ kwesịrị iji obere nloghachi kwenye. Nna-ukwu kwesịrị iwepụta ọnọdụ nkwụsị.
Ị nwekwara ike iji protocol a ka ịtọọ ntụnye maka adreesị ndebanye aha. Mgbe nna ya ukwu zipụchara adreesị ohu wee dee bit, ma ohu ahụ zaa ya na ntakịrị nkwenye, nna ya ukwu na-eziga byte iwu pointer (10110000, ma ọ bụ, 0xB0). Ohu ahụ ga-ekwupụta ntakịrị nkwenye ma nna ya ukwu ga-ezite adres nke ndekọ ahụ ka ọ tụọ aka na ebe nchekwa. Oge ọzọ ngwaọrụ ahụ gụrụ ma ọ bụ dee data na ndekọ, ọ ga-eme na adreesị a.
Mara: Ekwesịrị ịtọ nrịbama tupu ejie ngọngọ dee ma ọ bụ gbochie usoro ọgụgụ.
Ị nwere ike ịme protocol ide ngọngọ n'otu aka ahụ iji tọọ nrịbama. zipu ngọngọ dee iwu (10100000, ma ọ bụ, 0xA0) n'ọnọdụ nke pointer iwu, na ọnụ ọgụgụ nke bytes ezigara (na-anọchi anya dị ka a byte) ga-ewere ọnọdụ nke aha adreesị na-esote data bytes bụ indexed efu. Jiri otu protocol abụọ ahụ mgbe ị na-agụ data sitere na PmodIA: nata byte na igbochi ịgụ.
| Njikọ J1 – I² C Nkwukọrịta | ||
| Ntụtụ | Signal | Nkọwa |
| 1, 2 | SCL | I² C elekere |
| 3, 4 | SDA | I² C data |
| 5, 6 | GND | Ala ọkọnọ ike |
| 7, 8 | VCC | Ọkụ ọkụ (3.3V/5V) |
1.2 Isi mmalite elekere
PmodIA nwere oscillator ime nke na-ewepụta elekere 16.776 MHz iji mee ngwaọrụ ahụ. Ị nwere ike iji elekere mpụga site na itinye IC4 na PmodIA na ịtọ bit 3 na ndekọ njikwa (adreesị aha 0x80 na 0x81).
Atụmatụ PmodIA na-enye ndepụta oscillators akwadoro. Atụmatụ ahụ dị site na ibe ngwaahịa PmodIA na www.digilentinc.com.
1.3 Ịtọlite nzacha ugboro ugboro
Ihe mgbochi eletriki, ?, nke sekit nwere ike ịdịgasị iche n'ọtụtụ ugboro. PmodIA na-enye gị ohere ịtọlite ụka ugboro iji chọpụta njirimara impedance nke sekit. Mbụ, ị ga-edozi ihu ihu I² C n'etiti bọọdụ nnabata na PmodIA. PmodIA chọrọ ozi atọ iji mee nzacha ugboro ugboro: ugboro mmalite, ọnụ ọgụgụ nke nzọụkwụ na ihicha, na mmụba ugboro mgbe nzọụkwụ ọ bụla gasịrị. A na-echekwa ugboro mmalite na mmụba kwa nkeji nkeji dịka okwu 24-bit. A na-echekwa ọnụọgụ nzọụkwụ dị ka okwu 9-bit.
Ị nwere ike hazie ọnụ ọgụgụ kasị elu-to-peak voltage nke mmepụta ugboro na zaa site na ịtọ ibe n'ibe 10 na 9 na akara ndekọ. Ọnụ kacha elu na voltage kwesịrị ịtọ ya nke ọma n'ihe gbasara ule impedance. Nke a bụ iji zere ime ime.amps site n'ịgbalị ịnapụta mmepụta voltage ma ọ bụ ugbu a karịrị ike ha kacha. A na-atụ aro na mgbe ị na-eji 20-ohm nzaghachi resistor iji tọọ ọnụ ọgụgụ kasị elu na voltage na ma 200mV ma ọ bụ 400mV na mgbe ị na-eji 100K-ohm nzaghachi resistor, tọọ ọnụ ọgụgụ kasị elu ka vol.tagna 1V.
Ozugbo sekit ahụ nwere obi ụtọ, ọ na-ewe oge iji ruo ọnọdụ ya kwụ ọtọ. Ị nwere ike ịhazi oge nhazi maka isi ihe ọ bụla na-ekpochapụ ugboro ole site na ide uru iji debanye aha 0x8A na 0x8B. Uru a na-anọchi anya ọnụ ọgụgụ nke oge mmepụta ihe analọg-na-dijitalụ ga-eleghara tupu ọ malite s.ampling nzaghachi ugboro ugboro. (Lee Tebụl 2 maka ndepụta ndekọ aha na paramita ha kwekọrọ.)
| Adreesị ndebanye aha | Oke |
| 0x80, 0x81 | Ndebanye aha njikwa (Bit-10 na Bit-9 setịpụrụ ọnụ ọgụgụ kasị elu-na-elu voltage maka mmepụta ugboro). |
| 0x82, 0x83, 0x84 | Ugboro mmalite (Hz) |
| 0x85, 0x86, 0x87 | Mmụba kwa nzọụkwụ (Hz) |
| 0x88, 0x89 | Ọnụọgụ nke nzọụkwụ na mkpochapụ |
| 0x8A, 0x8B | Oge nhazi (ọnụọgụ nkeji oge mmepụta) |
Ị nwere ike gbakọọ okwu 24-bit ka ịchekwaa na adreesị ndekọ aha maka ugboro mmalite yana mmụba kwa nkeji nkeji site na iji koodu mmalite mmalite na koodu mmụba ugboro ugboro n'okpuru. Ị nwekwara ike ịhụ nha nha ndị a na ozi ndị ọzọ na mpempe data AD5933.
Ozugbo i debere paramita ndị a, mee usoro ndị a ka ịmalite ịsachapụ ugboro ole (nke e depụtara na mpempe data AD5933):
- Tinye ọnọdụ njikere site na izipu iwu njikere na ndekọ njikwa.
- Tinye ọnọdụ mmalite site na izipu mmalite na iwu ugboro ugboro na ndekọ njikwa.
Nke a na-enye ohere ka sekit a na-atụle ruo n'ọnọdụ ya kwụ ọtọ. - Malite mkpochapụ ugboro ole site na izipu iwu mkpochapụ ugboro ugboro na ndekọ njikwa.
1.4 Mgbakọ mgbochi
Ihe ntụgharị analọg-na-dijitalụ sampLes nzaghachi ugboro ugboro site na impedances amaghị na ruo 1MSPS nwere mkpebi 12-bit maka isi ihe ọ bụla na-ekpochapụ ugboro ole. Tupu echekwa nha, PmodIA na-eme mgbanwe mgbanwe nke anọ (DFT) na s.ampdata edu (1,024 samples maka usoro ugboro ọ bụla). Ndebanye aha abụọ na-echekwa nsonaazụ DFT: ezigbo ndekọ, na ndekọ echiche.
Mgbochi eletrik nwere ma nọmba n'ezie na nke e chepụtara echepụta. N'ụdị Cartesian, ị nwere ike igosipụta nhụsianya na nha anya:
z = Ezigbo + j ∗Echere echiche
Ebe Real bụ ezigbo akụrụngwa, Iche echiche bụ ihe a na-eche n'echiche, na ? bụ ọnụọgụ echiche (nke dabara na i = √−1, na mgbakọ na mwepụ). Ị nwekwara ike ịnọchite anya impedance n'ụdị polar:
Mmetụta = |z|∠θ
Ebe |Z| bụ oke na ∠θ bụ akụkụ akụkụ:
PmodIA anaghị eme mgbako ọ bụla. Mgbe DFT nke ọ bụla gasịrị, ngwaọrụ nna ukwu ga-agụrịrị ụkpụrụ dị na ndekọ Real and Imaginary.
Iji gbakọọ ezi impedance, ị ga-eburu n'uche uru. Ị nwere ike ịhụ example nweta ihe ngụkọ na mpempe data AD9533.
1.5 Ọgụgụ okpomọkụ
PmodIA nwere ihe mmetụta okpomọkụ 13-bit nke nwere onwe ya iji nyochaa okpomọkụ ngwaọrụ. Biko rụtụ aka na mpempe data AD5933 maka ozi ndị ọzọ gbasara njikwa modul a.
1.6 Adreesị ndebanye aha
Mpempe akwụkwọ AD5933 nwere tebụl ndekọ aha zuru ezu.
Akụkụ anụ ahụ
A na-ekewa ntụtụ ndị dị na nkụnye eji isi mee ihe 100 mil iche. PCB dị sentimita 1.6 n'ogologo n'akụkụ ya na ntụtụ dị na nkụnye eji isi mee na 0.8 sentimita asatọ n'ogologo n'akụkụ ya na-adaba na nkụnye eji isi mee.
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DIGILENT PmodIA nwere bọọdụ Microcontroller elekere mpụga [pdf] Akwụkwọ ntuziaka onye ọrụ PmodIA na bọọdụ Microcontroller elekere mpụga, PmodIA, ya na bọọdụ microcontroller elekere mpụga, bọọdụ microcontroller mpụga, bọọdụ Microcontroller elekere, bọọdụ Microcontroller, bọọdụ. |