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AS7058 数据表(PDF) 30 Page - ams-OSRAM AG |
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AS7058 数据表(HTML) 30 Page - ams-OSRAM AG |
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30 / 199 page  AS7058 Functional description Datasheet • PUBLIC • Document Feedback DS001077 • v2-00 • 2025-Sep-24 30 / 199 / 7.4 PPG/ECG sequencer In order to unload MCU with re-occurring measurement tasks to be triggered and its related timing constraints, AS7058 has a built in measurement sequencer which controls all relevant PPG and ECG/Bioimpedance blocks with its corresponding timings. An overview of the sequencer timing diagram is shown in Figure 27. Figure 27: PPG/ECG sequencer timing diagram The sequencer basically supports three different sample rates which can be configured independently from each other. All timings for the sequencer are derived from the on-chip 32 kHz oscillator. The PPG measurement channel can be configured independently from the ECG/BioZ sampling periods. Whereas the PPG channel allows for one sample rate for each PPG sample measurement the ECG/BioZ sequencer supports two different sample rates which are called SEQ1 Sample Period and SEQ2 Sample Period. The benefit of having two different sample rates as part of the ECG/BioZ sequencer, like it is shown in Figure 27, is that an ECG measurement can for example run with SEQ2 at a sample rate of e.g. 400 Hz and the AC lead off detection can run with SEQ1 at a much higher frequency. Figure 28: Sequencer clock generation PPG Seqeuncer ECG / BioZ Sequenzer PPG Sample PPG Sample PPG Sample PPG Sample PPG Sample Period PPG Sample Period PPG Sample Period PPG Sample Period 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 SEQ1 Sample Period ECG/BioZ Sample SEQ1 SEQ1 Sample Period ECG/BioZ Sample SEQ1 SEQ 2 Sample Period SEQ 2 Sample Period t 32kHz On Chip Oscillator ECG Base Divider 16 bit PPG Clock Divider 16 bit ECG 2 Clock Divider 16 bit ECG2_FREQDIVH[7: 0] ECG2_FREQDIVL[7:0] PPG_FREQH[7:0] PPG_FREQL[7: 0] Clock to PPG Sequencer Clock to ECGPPG Sequencer 2 ECG_FREQH[7:0] ECG_FREQL[7:0] ECG 1 Clock Divider 16 bit ECG1_FREQDIVH[7: 0] ECG1_FREQDIVL[7:0] Clock to ECG/PPG Sequencer 1 |
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