Cogo di ka teliya ka Crystal Oscillator dɛsɛw dɔn?

• Gɛlɛya jumɛnw bɛ se ka lase cristal oscillateur fililen ma?

1.Jaabi tɛ sɔrɔ fanga-kɔrɔ (dɛsɛ gɛlɛn): Ni kristalɛ-yɛrɛyɛrɛ ma Se ka Yɛlɛma daminɛ, kunnafoni-di-minɛnba tɛ 'waati jatebɔlan Sɔrɔ, kɔnɔna-la-segin-ka-bɔ-cogo tɛ Se ka Dafa, wa sistɛmu bɛɛ bɛ To baara la. Taamaʃyɛn suguya dɔw ye: kuran dicogo min ka dɔgɔn kosɛbɛ baarakɛcogo la, debug interface (debug interface) ma dɔn, ani jirali tɛ kɛ ɛkran kan.

2.A bɛ kɛ cogo si la walima a bɛ se ka segin a cogo kɔrɔ la baara kɛtuma na (dɛsɛ nɔgɔlen): oscillateur ka bɔli amplitude dɔgɔyali walima frequency (fɔkan) caman cili barikama, o bɛ na ni CPU waati tiɲɛniw ye ani cikanw waleyali min tɛ bɛn ɲɔgɔn ma. Taamaʃyɛn minnu ka teli ka ye, olu ye jɔrɔnanko ye tuma dɔw la, reset minnu bɛ daminɛ kɔlɔsilikɛla fɛ, ani filiw lasegincogo min tɛ bɛn ɲɔgɔn ma.

3.Ckumaɲɔgɔnyainterface desynchronisation ani bitiki filiw:Waati frequency deviation (PPM fili) bɛ se ka tɛmɛ bit-synchronization window kan protocoles i n’a fɔ UART, USB, ani Ethernet, o bɛ na ni dataw tiɲɛnenw ye, checksum dɛsɛw, ka dɔ fara broadcast kan, ani, ni a ka jugu, physical-link dropout dafalen.

4.Waati ni sumani kɛcogo tiɲɛnen:RTCw, kuran jateminɛnanw, ani baara wɛrɛw kama minnu bɛ u jigi da waati basigilen tigitigi kan, frequency drift bɛ dalajɛ walasa ka don o don waati filiw lase. Ni kristalɛ tɔɔrɔla ji doncogo fɛ walima kɔrɔya fɛ, -pulse interval filanan bɛ bɔ, o bɛ nɔ bila fatura tiɲɛni na walima sistɛmu-waati tigitigi la.

• Mun na Kristali Oscillateurs bɛ Dɛsɛ?

Ka fara fɛn dilanni nafamafɛnw kan (i n’a fɔ kɔnɔna fili-bond voids walima residual stress), dɛsɛ fɛɛrɛ minnu bɛ sɔrɔ foro baara la tuma caman na, olu ye:

1.Masina degun ni funteni-sɔgɔli:Kristali blanks minnu ka ca -frequency (fɛrɛnkan) la, olu ka fin kosɛbɛ. Kɔrɔta degun PCB depanelization waati ani funteni jiginni teliya la reflow soldering waati bɛ se ka kɛ sababu ye ka micro-cracks walima electrode detachment bila mɔgɔ la, o bɛ na ni wuliba ye equivalent series resistance (ESR) la.

2.PCB baarakɛcogo nɔgɔli (flux residu): .Soldering-flux residues bɛ leakage sira barikamaw dilan pinɛw ni ɲɔgɔn cɛ, ka paralɛli paraziti bɔnɛ kunbɛnni don a la cogo ɲuman na min bɛ oscillation-loop gain dɔgɔya. Ko nɔgɔmanw bɛ na ni frequency deviation ye; bana jugumanw bɛ na ni jiginni bɔnɛ ye.

3.Yɛlɛmacogo min bɛ kɛ ni overtone mode ye:Ni doni capacitance walima driver stage ma labɛn ka ɲɛ, oscillateur bɛ se ka lock kɛ cristal ka overtone frequency 3nan walima 5nan kan. O cogo la, kristalɛ yɛrɛ tɛ kari, nka sistɛmu wagati bɛ kɛ frequency laɲininen cayalenba ye, wa periferiw bɛɛ bɛ baara kɛ ka ɲɛ.

4.Kuran bɔli (ESD) tiɲɛni:O farati in nafa ka bon kɛrɛnkɛrɛnnenya la oscillateurs actives la minnu kɔnɔ CMOS circuitry bɛ sɔrɔ. ESD bɛ se ka gate oxide tiɲɛ, wa o fili bɛ to ka jira i n’a fɔ frequency instability ni funteni bɛ wuli.

5.Frequency-funteni jiginni:Funteni dan minnu kofɔlen don kunnafonidilan kɔnɔ, olu kɛrɛfɛ (misali la, –20℃walima +70℃), frequency deviation bɛ bonya kosɛbɛ. Ni puce yɛrɛ-sumaya ye dɔ fara a lamini funteni kan, o offset yɛrɛ bɛ se ka se ppm kɛmɛ caman ma.

6.Bololabaara fanga tɛmɛnen: Drive current (kurun bolicogo) min ka bon kojugu, o bɛ funteni degun lawuli kristalɛ blank kan, ka kɔrɔya teliya, wa a bɛ se ka yɛrɛ ka impedansi caman ɲɔgɔnna caman lawuli, ka frequency stability (fɔkan sabatili) tiɲɛ.

• How ka Dɔgɔya farati la Kristali Oscillateur tiɲɛni na?

1.PCB layout ka kan ka a yɛrɛ tangamasinko siratigɛ lahamina:Aw bɛ kristalɛ bila ka surunya IC pinɛw la cogo bɛɛ la, ka taamasiyɛnw kɛ ka surunya ani ka dugukolo-kɔlɔsi; aw kana a bila panɛli-danfara dakunw kɛrɛfɛ walima degunba yɔrɔw la, ani ka jateminɛ kɛ ka danfara yɔrɔw fara a kan.

2.Soldering ani saniya kɔlɔsili: Aw bɛ baara kɛ ni no-flux saniyalen ye ani ka ion nɔgɔ sɛgɛsɛgɛli kɛ reflow soldering kɔfɛ; aw kana degun jɔlen kɛ kristalɛ farikolo la.

3.Aw bɛ bolifɛn fanga bɛnnen sigi:Aw bɛ seri current-limiting resistor (a ka c’a la 100 Ω fo 1 kΩ) don walasa ka drive fanga yɛrɛ mara 100 μW duguma, ka kɛɲɛ ni datasheet-ladili hakɛw ye.

4.ESD lakanani:Aw bɛ bolokɔni sirilan anti-static don bolola solder kɛtuma na, ani ka aw jija ka baarakɛyɔrɔ sigi ka ɲɛ.

5.Lamini ladamuni:Ni aw bɛ kɛnɛma walima mobili baara gɛlɛnw kɛ, aw bɛ izini/mobili-grade (–40℃to +125℃) nɛgɛ-pake kristalɛw sugandi minnu fana bɛ se ka ji ni sulfidation kɛlɛ.