поискавой системы для электроныых деталей |
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TC815CBU датащи(PDF) 8 Page - Microchip Technology |
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TC815CBU датащи(HTML) 8 Page - Microchip Technology |
8 / 26 page TC815 DS21474B-page 8 © 2002 Microchip Technology Inc. FIGURE 3-1: RATIOMETRIC RESISTANCE MEASUREMENT FUNCTIONAL DIAGRAM FIGURE 3-2: RESISTANCE MEASUREMENT ACCURACY SET BY EXTERNAL STANDARD RESISTOR Buffer TC815 R6/100k Ω 50 32 S19 DE S20 VCC - 2.6V 1.5kV VCC Low Ohms HI Ohms VA S29 S30 S31 S32 S33 ÷1 ÷10 ÷100 ÷1k ÷10k S28 S27 S26 S25 S24 DE S23 Voltage Reference 39 38 37 36 35 Integrator Comparator S37 S35 55 54 R ΩBUF S12 S13 DE S18 S21 DE INT • ( Ω + DC) 33 CREF 0.1µF R7/100k 31 Analog Common 29 34 28 10k Ω 57 30 30 VSSA 9V R18 24k Ω 5k Ω REFHI 220k Ω 49 0.1µF 150k Ω RVIBUF 47 CINT 0.1µF S36 S34 RX Unknown R8 220 Ω V • 1 1 R5/1638500 Ω R4/163850 Ω R3/16385 Ω R2/1638.5 Ω R1/163.85 Ω DE + Ω • LO CAZ VCC - 2.8V ≈ VSSD VCC ~ 1.5k Ω ~ • • • DE • Ω • • 50 Ω Ω Ω Ω Ω Ω Ω Ω Ω + – Example: 200k Ω Full Scale Measurement VR 163.85k Ω 163.85 220 RX ++ ------------------------------------------------- x0.64 = (a ) (b) VX RX 163.85k Ω 220Ω RX ++ -------------------------------------------------------------- x0.64 = (c) “Ramp Up Voltage” = “Ramp Down Voltage” VX R ICI () ----------------xT I VX R ICI () ----------------T DE = . .. Where: RI = Integrating Resistor, TI = Integrate Time CI = Integrating Capacitor, TDE = Deintegrate Time (d) RX = 163.85 TI (TDE) Independent of RI,CI or Internal Voltage Reference Unknown RX 220 Ω 0.64V for Ohms 0.32V for LO Ohms To Analog Buffer VX VR CREF 100 k Ω RS 16.385k + VR VA |
Аналогичный номер детали - TC815CBU |
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Аналогичное описание - TC815CBU |
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