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| 型號： | AD7143ACPZ-1REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 18/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV CAP-TO-DGTL PROG 16LFCSP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 類型： | 電容數(shù)字轉(zhuǎn)換器 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 邏輯 |
| 接口： | I²C |
| 電流 - 電源： | 1mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
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AD7143
Rev. 0 | Page 24 of 56
Table 12. Additional Information about Environmental Calibration and Adaptive Threshold Registers
Register
Location
Description
NEG_THRESHOLD_SENSITIVITY
Bank 2
Used in Equation 2. This value is programmed once at start up.
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 gets within the NEG_PEAK_DETECT
percentage of the minimum average, only then is the minimum average value 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 gets within the POS_PEAK_DETECT
percentage of the minimum average, only then is the maximum average value updated.
STAGE_OFFSET_LOW
Bank 2
Used in Equation 2. An initial value (based on sensor characterization) is programmed
into this register at startup. The AD7143 on-chip calibration algorithm automatically
updates this register based on the amount of sensor drift due to changing ambient
conditions. Set to 80% of the STAGE_OFFSET_LOW_CLAMP value.
STAGE_OFFSET_HIGH
Bank 2
Used in Equation 1. An initial value (based on sensor characterization) is programmed
into this register at startup. The AD7143 on-chip calibration algorithm automatically
updates this register based on the amount of sensor drift due to changing ambient
conditions. Set to 80% of the STAGE_OFFSET_HIGH_CLAMP value.
STAGE_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 a sensor output value to
exceed the expected nominal value. Set to the maximum expected sensor response,
maximum change in CDC output code.
STAGE_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 a sensor output value to
exceed the expected nominal value. Set to the minimum expected sensor response,
minimum change in CDC output code .
STAGE_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.
STAGE_HIGH_THRESHOLD
Bank 3
Equation 1 Value.
STAGE_LOW_THRESHOLD
Bank 3
Equation 2 Value.
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