Cov lus qhia ntxaws ntxaws ntawm peb lub ntsiab ntawm cov timer tsis muaj

1. Lub sij hawm tsis: Cov tub ntxhais tswj qhov ntev ntawm lub timer
Lub sijhawm ntsuas tsis txhob txiav txim siab lub sijhawm ua haujlwm lub voj voog thiab ncua kev cuam tshuam, thiab muab faib ua ob pawg:

1. Ib Leeg {-}}}}}}}} tua, qhov kev txiav txim yog tua ib zaug, xws li tsis siv neeg kaw kev ua haujlwm ntawm lub tsev hauv tsev. Cov ntsiab lus raug ntau los ntawm 0.1 milliseconds (xws li StM32 lub sijhawm kho vajtse (muaj zog ua haujlwm). Qhov tseeb nyob ntawm lub moos tau los (piv txwv li, crystal oscillator yuam kev ± 50pprpm).

2. Lub sijhawm voj voog: rov ua dua tshiab ntawm lub sijhawm ruaj khov, xws li PWM teeb liab tiam. Lub sijhawm ib ntu ntawm 1μs rau 1μs rau 1s (xa mus rau phau ntawv Texas series) thiab yuav tsum phim qhov tseeb- lub sij hawm xav tau ntawm txoj haujlwm.

* Ncua ceeb toom *: Rau siab - prefer scenarios (xws li kub {{}) yuav tsum muaj kev ua yuam kev hauv ± 0.01%. Rau cov khoom siv hauv tsev ib txwm muaj, ib qho RC Oscillator Circuit Court (± 5% yuam kev) tuaj yeem siv.

2. Cov hom kev txiav txim siab: txiav txim siab lub sijhawm pib
Cov qauv ua rau muaj cov qauv tau raug categorized li cov khoom kho vajtse thiab software:

1. Hardware Kauj Ruam: Ua kom tiav los ntawm cov cim sab nraud, piv txwv li:

- ntug ua yeeb yam (Routing Right (Rising Ntug

-} theem ua rau: lub sijhawm tsis tu ncua thaum muaj kev tswj hwm qhov ntev.

2. Software txhais tau tias los ntawm cov lus qhia kev pab cuam tab sis kuj tseem muaj qhov latency (feem ntau} 100} - lub sijhawm ua haujlwm.

* Kev txheeb xyuas cov khoom siv *: Cov khoom sib piv yog tsim rau high- nrawm txheej xwm yog qhov tsim nyog rau kev tswj kev tswj logic sai.

3. Qhov tseeb tsis muaj: Qhov tseem ceeb cuam tshuam sijhawm kev ntseeg tau
Qhov tseeb yog txiav txim siab los ntawm ob lub moos moos thiab kev tsim puag ncig hluav taws xob. Qhov ntsuas tseem ceeb muaj xws li:

1. Lub moos ruaj khov: qhov kub hloov tuaj yeem ua rau cov siv lead ua oscillator zaus txav mus los. Piv txwv li, qhov cub {- tswj cov siv lead ua etcillators (Ocxos) muaj qhov ruaj khov ntawm ± 0.001ppm (saib EPSON SG-8101 DATACHEET), tab sis qhov no yog kim.

2. Kev daws teeb meem: Lub sijhawm hloov me me ntxiv. Ib 32 - ntsis timer (xws li caj npab Cortex-m) tuaj yeem ua tiav kev daws teeb meem ntawm 1 / (84MHz) ≈ 11.9N.

3. Jitter: teeb liab sij hawm sib txawv. Lub siab - Lub sij hawm zoo muaj jitter <1ns (piv txwv li, cov labs silicon lirasheet).

* Daim ntawv thov cov lus pom zoo *: Kev siv tshuab taw qhia pom zoo siv cov ntawv teev cov npe nrog kev them nyiaj yuam kev, thaum cov neeg siv khoom siv hluav taws xob tuaj yeem txi cov nqi.

Los ntawm kev teeb tsa zoo saum toj no, lub timer tuaj yeem hloov kho kom haum rau cov xwm txheej zoo nkauj Thaum xaiv lub sijhawm, xav txog kev ua lag luam - tawm ntawm cov nqi, qhov tseeb, thiab kev teb ceev. Tham cov tub tsim khoom lub datasheet rau kev txheeb xyuas.