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TC818A датащи(PDF) 9 Page - Microchip Technology |
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TC818A датащи(HTML) 9 Page - Microchip Technology |
9 / 24 page © 2002 Microchip Technology Inc. DS21475B-page 9 TC818A FIGURE 3-2: RATIOMETRIC RESISTANCE MEASUREMENT FUNCTIONAL DIAGRAM FIGURE 3-3: RESISTANCE MEASUREMENT ACCURACY SET BY EXTERNAL STANDARD RESISTOR Buffer TC818A R6/100k Ω 32 S19 DE S20 VCC -2.6V 1.5k Ω 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 • ( + DC) 33 CREF 0.1µF R7/100k Ω 31 Analog Common 29 34 28 10k 57 VSS 9V R18 24k Ω 5k Ω REFHI 220k 49 0.1µF 150k Ω RVIBUF 47 CINT 0.1µF S36 S34 RX Unknown R8 220 Ω (PTC) V • 1 1 R5/1638500 R4/163850 R3/16385 R2/1638.5 R1/163.85 Ω Ω DE + Ω • LO CAZ ≈ VCC -2.8V VCC + ~ 1.5k Ω ~ • • • DE • • • 50 Ω Ω Ω Ω Ω Ω 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 = De-integrate Time (d) RX = 163.85 TI (TDE) Independent of RI,CI or Internal Voltage Reference 163.85k Ω CREF 220 RX Unknown To Analog Buffer 100k Ω VA = 0.64V for Ohms 0.32V for LO Ohms + Ω RS VR VX |
Аналогичный номер детали - TC818A |
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Аналогичное описание - TC818A |
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