參數(shù)資料
型號： AD7147WPACPZ-1500R
廠商： Analog Devices Inc
文件頁數(shù)： 22/73頁
文件大?。?/td> 0K
描述： IC CAP-TO-DGTL CONV PROG 24LFCSP
標(biāo)準(zhǔn)包裝： 500
系列： CapTouch™
類型： 電容數(shù)字轉(zhuǎn)換器
分辨率（位）： 16 b
采樣率（每秒）： 250k
數(shù)據(jù)接口： I²C，串行
電壓電源： 單電源
電源電壓： 2.6 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 24-LFCSP-VQ（4x4）
包裝： 帶卷 (TR)
AD7147
Data Sheet
Rev. D | Page 28 of 72
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
MAXIMUM
LEVEL
DETECTION
LOGIC
MINIMUM
LEVEL
DETECTION
LOGIC
16
Σ-
16-BIT
CDC
06
66
3-
0
36
Figure 39. Tracking the Minimum and Maximum Average Sensor Values
Table 14. Additional Information About Environmental Calibration and Adaptive Threshold Registers
Register
Location
Description
Register/Bit
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 AD7147 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 AD7147 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.
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