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TC811CKW データシート(PDF) 11 Page - Microchip Technology |
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TC811CKW データシート(HTML) 11 Page - Microchip Technology |
11 / 14 page 11 TC811 TC811-7 11/5/96 © 2001 Microchip Technology Inc. DS21472A 3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs Liquid Crystal Display Sources Several LCD manufactures supply standard LCD dis- plays to interface with the TC811 3-1/2 digit analog-to-digital converter. Figure 10. TC811 Internal Voltage Reference Connection Figure 11. Low Parts Count Ratio Metric Resistance Measurement Representative Manufacturer Address/Phone Part Numbers* Crystaloid 5282 Hudson Dr., C5335, H5535, Electronics Hudson, OH 44236 T5135, SX440 216-655-2429 AND 770 Airport Blvd., FE 0801, Burlingame, CA 94010 FE 0203 415-347-9916 EPSON 3415 Kashikawa St., LD-B709BZ Torrence, CA 90505 LD-H7992AZ 212-534-0360 Hamlin, Inc. 612 E. Lake St., 3902, 3933, 3903 Lake Mills, WI 53551 414-648-2361 *NOTE: Contact LCD manufacturer for full product listing/specifications. VREF + VREF – VIN + VIN – ANALOG COMMON TC811 LCD RSTANDARD RUNKNOWN V + HLDR V – ANALOG COMMON TC811 VREF + 32 33 36 26 240k Ω 10k Ω VREF – VREF 38 + 9V SET VREF = 1/2 VFULL SCALE V + Oscillator Crystal Source Representative Manufacturer Address/Phone Part Numbers STATEK 512 N-Main CX-1V 40.0 Orange, CA 92668 714-639-7810 Ratiometric Resistance Measurements The TC811 true differential input and differential refer- ence make ratiometric readings possible. In ratiometric operation, an unknown resistance is measured with respect to a known standard resistance. No accurately defined reference voltage is needed. The unknown resistance is put in series with a known standard and a current is passed through the pair (Figure 11). The voltage developed across the unknown is applied to the input and the voltage across the known resistor applied to the reference input. If the unknown equals the standard, the input voltage will equal the reference voltage and the display will read 1000. The displayed reading can be determined from the following expression: Displayed reading = x 1000 The display will overrange for RUNKNOWN ≥ 2 X RSTANDARD. RUNKNOWN RSTANDARD |
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