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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7143 датащи(PDF) 16 Page - Analog Devices |
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AD7143 датащи(HTML) 16 Page - Analog Devices |
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16 / 57 page  AD7143 Rev. 0 | Page 15 of 56 STAGE7 STAGE6 STAGE5 STAGE4 STAGE3 STAGE2 STAGE1 STAGE0 Σ-Δ 16-BIT ADC CIN0 CIN1 CIN2 CIN3 CIN4 CIN5 CIN6 CIN7 Figure 23. CDC Conversion Stages The number of required conversion stages depends completely on the number of sensors attached to the AD7143. Figure 24 shows how many conversion stages are required for each sensor, and how many inputs each sensor requires to the AD7143. BUTTONS STAGE0 CDC STAGE0 CDC + – STAGE1 8-ELEMENT SLIDER CDC + – + – STAGE1 + – CDC AD7143 SEQUENCER CDC STAGE2 + – STAGE3 + –CDC CDC STAGE4 + – STAGE5 + –CDC CDC STAGE6 + – STAGE7 + –CDC AD7143 SEQUENCER SRC SRC S2 S3 S1 Figure 24. Sequencer Setup for Sensors A button sensor generally requires one sequencer stage. However, it is possible to configure two button sensors to operate differentially for special applications where the user should not press both buttons simultaneously, such as a with rocker zoom switch on a digital camera. In this case, only one button from the pair is activated at a time; pressing both buttons together activates neither button. This example is shown in Figure 24 for sensor buttons S2 and S3. A scroll bar or slider requires eight stages. The result from each stage is used by the host software to determine the user’s position on the scroll bar. The algorithm that performs this process is available from Analog Devices free of charge, upon signing a software license. Scroll wheels also require eight stages. CDC CONVERSION SEQUENCE TIME The time required for one complete measurement for all eight stages by the CDC is defined as the CDC conversion sequence time. The SEQUENCE_STAGE_NUM register and DECIMATION register determine the conversion time as listed in Table 8. Table 8. CDC Conversion Times for Full Power Mode Conversion Time (ms) SEQUENCE_STAGE_NUM Decimation = 128 Decimation = 256 0 1.525 3.072 1 3.072 6.144 2 4.608 9.216 3 6.144 12.288 4 7.68 15.25 5 9.216 18.432 6 10.752 21.504 7 12.288 24.576 For example, while operating with a decimation rate of 128, if the SEQUENCE_STAGE_NUM register is set to 5 for the conversion of six stages in a sequence, the conversion sequence time is 9.216 ms. Full Power Mode CDC Conversion Sequence Time The full power mode CDC conversion sequence time for all eight stages is set by configuring the SEQUENCE_STAGE_NUM register and the DECIMATION register as outlined in Table 8. Figure 25 shows a simplified timing diagram of the full power CDC conversion time. The full power mode CDC conversion time tCONV_FP is set using Table 8. CONVERSION SEQUENCE N CONVERSION SEQUENCE N + 1 CONVERSION SEQUENCE N + 2 CDC CONVERSION tCONV_FP Figure 25. Full Power Mode CDC Conversion Sequence Time |
Аналогичный номер детали - AD7143_17 |
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Аналогичное описание - AD7143_17 |
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