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AS7058 数据表(PDF) 39 Page - ams-OSRAM AG |
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AS7058 数据表(HTML) 39 Page - ams-OSRAM AG |
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39 / 199 page  AS7058 Functional description Datasheet • PUBLIC • Document Feedback DS001077 • v2-00 • 2025-Sep-24 39 / 199 / Figure 33: Tripple measurement mode – simplified timing diagram 7.5.2.3 Advanced automatic offset compensation (AAOC) The built in AAOC is an advanced ambient light compensation solution which does not require an external host to adjust the DAC offset current. In conventional approach with Double Measurement and Tripple Measurement the DAC offset current registers need to be controlled and adjusted by a host MCU via I²C or SPI interface. This approach might require several measurement iterations until an appropriate offset value is found. The AAOC function eliminates the need of MCU interaction to find the correct photodiode offset current. It is based on a successive approximation approach to determine the upper 4 bits of the photodiode offset register. In order to achieve this and adjust the 4 bits accordingly. AS7058 does four short measurements prior to the actual PPG measurement like it is shown in Figure 34. During each pre-measurement cycle the LED is also switched on and the ADC data read is feed into the SAR algorithm which adjusts the photodiode current. Photodiode Selection Photodiode Offset Current LED On ADC Modulator ADC Reset SINC Downsampler Sample Data LED Off Sample Data LED OFF Sample Data LED On Sample Data LED On Sample Data LED Off Sample Data LED OFF Result Sample Difference DATA LED OFF/2 + DATA LED ON – DATA LED OFF/2 PPG Sequencer PPG Sample PPG Sample PPG Sample PPG Sample Period PPG Sample Period t Subsample 1 Subsample 2 Subsample 3 Subsample 4 Subsample 5 Subsample 6 Subsample 7 Subsample 8 PPG Sub-Samples Tripple PPG Measurement |
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