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参数资料
| 型号： | AD7147WPACPZ-500R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/73页 |
| 文件大小： | 0K |
| 描述： | IC CAP-TO-DGTL CONV PROG 24LFCSP |
| 标准包装： | 500 |
| 系列： | CapTouch™ |
| 类型： | 电容数字转换器 |
| 分辨率（位）： | 16 b |
| 采样率（每秒）： | 250k |
| 数据接口： | 串行，SPI? |
| 电压电源： | 单电源 |
| 电源电压： | 2.6 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 带卷 (TR) |
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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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