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AD7147A Folha de dados(PDF) 27 Page - Analog Devices |
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AD7147A Folha de dados(HTML) 27 Page - Analog Devices |
27 / 69 page AD7147A Rev. B | Page 26 of 68 BANK 3 REGISTERS STAGEx_MAX_WORD0 STAGEx_MAX_WORD1 STAGEx_MAX_WORD2 STAGEx_MAX_WORD3 STAGEx_MIN_WORD0 STAGEx_MIN_WORD1 STAGEx_MIN_WORD2 STAGEx_MIN_WORD3 STAGEx_MAX_AVG BANK 3 REGISTERS STAGEx_MAX_TEMP BANK 3 REGISTERS STAGEx_HIGH_THRESHOLD BANK 3 REGISTERS STAGEx_MIN_AVG BANK 3 REGISTERS STAGEx_MIN_TEMP BANK 3 REGISTERS STAGEx_LOW_THRESHOLD BANK 3 REGISTERS BANK 3 REGISTERS MAXIMUM LEVEL DETECTION LOGIC MINIMUM LEVEL DETECTION LOGIC 16 Σ-Δ 16-BIT CDC Figure 38. Tracking the Minimum and Maximum Average Sensor Values Table 15. Additional Information About Environmental Calibration and Adaptive Threshold Registers Register/Bit Register Location Description NEG_THRESHOLD_SENSITIVITY Bank 2 Used in Equation 2. This value is programmed once at startup. NEG_PEAK_DETECT Bank 2 Used by internal adaptive threshold logic only. The NEG_PEAK_DETECT is set to a percentage of the difference between the ambient CDC value and the minimum average CDC value. If the output of the CDC approaches the NEG_PEAK_DETECT percentage of the minimum average, the minimum average value is updated. POS_THRESHOLD_SENSITIVITY Bank 2 Used in Equation 1. This value is programmed once at startup. POS_PEAK_DETECT Bank 2 Used by internal adaptive threshold logic only. The POS_PEAK_DETECT is set to a percentage of the difference between the ambient CDC value and the maximum average CDC value. If the output of the CDC approaches the POS_PEAK_DETECT percentage of the maximum average, the maximum average value is updated. STAGEx_OFFSET_LOW Bank 2 Used in Equation 2. An initial value (based on sensor characterization) is programmed into this register at startup. The AD7147A on-chip calibration algorithm automatically updates this register based on the amount of sensor drift due to changing ambient conditions. Set this register to 80% of the STAGEx_OFFSET_LOW_CLAMP value. STAGEx_OFFSET_HIGH Bank 2 Used in Equation 1. An initial value (based on sensor characterization) is programmed into this register at startup. The AD7147A on-chip calibration algorithm automatically updates this register based on the amount of sensor drift due to changing ambient conditions. Set this register to 80% of the STAGEx_OFFSET_HIGH_CLAMP value. STAGEx_OFFSET_HIGH_CLAMP Bank 2 Used by internal environmental calibration and adaptive threshold algorithms only. An initial value (based on sensor characterization) is programmed into this register at startup. The value in this register prevents a user from causing the output value of a sensor to exceed the expected nominal value. Set this register to the maximum expected sensor response or the maximum change in CDC output code. STAGEx_OFFSET_LOW_CLAMP Bank 2 Used by internal environmental calibration and adaptive threshold algorithms only. An initial value (based on sensor characterization) is programmed into this register at startup. The value in this register prevents a user from causing the output value of a sensor to exceed the expected nominal value. Set this register to the minimum expected sensor response or the minimum change in CDC output code. STAGEx_SF_AMBIENT Bank 3 Used in Equation 1 and Equation 2. This is the ambient sensor output when the sensor is not touched, as calculated using the slow FIFO. STAGEx_HIGH_THRESHOLD Bank 3 Equation 1 value. STAGEx_LOW_THRESHOLD Bank 3 Equation 2 value. |
Nº de peça semelhante - AD7147A |
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Descrição semelhante - AD7147A |
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