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ADC3908CSSS Datasheet(PDF) 43 Page - Texas Instruments |
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ADC3908CSSS Datasheet(HTML) 43 Page - Texas Instruments |
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43 / 131 page  6.3.6.2 Digital Comparator The ADC3910Dx and ADC3910Sx has two internal digital comparators. The digital comparator controls the output ALERT pin buffer. ALERT pin can be configured as open-drain or push-pull using the ALERT_OD (0x090) register. Figure 6-24 shows the block diagram for the digital comparator. CHA 10-bit data/DDC data High threshold - Hysteresis Low threshold + Hysteresis ALERT CHB 10-bit data/DDC data DWC0 DATA SEL[2:0] DWC0 CONFIG SEL[0] ALERT_FLAG Event Counter EVENT_FLAG Window Size [15:0] ALERT_CFG EVENT_CFG Figure 6-24. Digital Comparator Block Diagram 6.3.6.2.1 Comparator Data Select Each digital comparator has the capability of selecting either channel with or without decimation data via SPI write (0x201, 0x203). Comparator B Comparator A ALERT ADC A ADC B N N Channel Correction Channel Correction Figure 6-25. Comparator multiplexer 6.3.6.2.2 Comparator High and Low Threshold The digital comparator high-side threshold, low-side threshold and hysteresis (optional) parameters are independently programmed for each digital comparator (COMP_THRESHOLD_HI_CHx, COMP_THRESHOLD_LO_CHx, COMP_HYSTERESIS_CHx) via SPI write to registers 0x0C8-0x0D3. 6.3.6.2.3 Comparator Configuration Compare Mode The digital comparator can be configured to either standard compare or slew compare via SPI write SLEW_CHx (0x0D3). Standard Compare level based: • COMP_THRESHOLD_HI_CHx - COMP_HYSTERESIS_CHx • COMP_THRESHOLD_LO_CHx + COMP_HYSTERESIS_CHx Slew Compare to detect based on difference between subsequent samples: • Current sample - Previous sample > COMP_THRESHOLD_HI_CHx • Current sample - Previous sample < COMP_THRESHOLD_LO_CHx www.ti.com ADC3910D025, ADC3910D065, ADC3910D125 ADC3910S025, ADC3910S065, ADC3910S125 SBASAD1A – DECEMBER 2023 – REVISED MAY 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 43 Product Folder Links: ADC3910D025 ADC3910D065 ADC3910D125 ADC3910S025 ADC3910S065 ADC3910S125 |
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