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AS7058 数据表(PDF) 45 Page - ams-OSRAM AG |
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AS7058 数据表(HTML) 45 Page - ams-OSRAM AG |
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45 / 199 page  AS7058 Functional description Datasheet • PUBLIC • Document Feedback DS001077 • v2-00 • 2025-Sep-24 45 / 199 / 7.6 ECG/BioZ sample structure The ECG/BioZ sequencer supports two sequencers (Sequencer 1 and Sequencer 2) which can run with two different sample periods. Sequencer 1 has the option to enable two sub- samples which is typically used for bioimpedance measurements where in subsample 1 the amplitude and in subsample 2 the phase is measured. Sequencer 2 supports only one subsample which is called subsample 3 shown in Figure 39. This subsample can be used to support AC lead off detection which would require a different sample rate than an ECG measurement which can be assigned to Sequencer 1. Figure 39: ECG/BioZ sample structure and configuration options The sample frequency, which can be programmed, uses a 32 kHz clock as the base frequency. An overview about the clock generation of the ECG/BioZ Sequencer is shown in Figure 28. Typical ECG sampling frequencies and the necessary register configuration for the clock dividers is shown in Table 10. Sequenzer 1 Sequenzer 2 Subsample 1 Subsample 2 Subsample 3 ECG1 SINC Filter Downsampler Setting ECG2 SINC Filter Downsampler Setting Sub 1 Gain Sub 2 Gain Sub 3 Gain Sub 1 Input MUX Sub 2 Input MUX Sub 3 Input MUX ECG / BioZ Sequencer ECG/BioZ Sample SEQ2 SEQ1 SEQ1 Sample Period ECG/BioZ Sample SEQ1 ECG/BioZ Sample SEQ2 SEQ1 ECG/BioZ Sample SEQ1 SEQ1 Sample Period SEQ1 Sample Period SEQ 2 Sample Period t Sample Structure and Configuration |
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