参数资料
| 型号： | MPR032EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 13/33页 |
| 文件大小： | 0K |
| 描述： | IC CTLR TOUCH SENSOR 8-DFN |
| 产品培训模块： | MPR03x - Low-Power Proximity Sensors |
| 特色产品： | MPR03x Proximity Capacitive Touch Sensor Controllers |
| 标准包装： | 1 |
| 类型： | 电容性 |
| 触摸面板接口： | 2 线 |
| 评估套件： | 可供 |
| 数据接口： | I²C，串行 |
| 数据速率/采样率 (SPS，BPS)： | 400k |
| 电源电压： | 1.71 V ~ 2.75 V |
| 电流 - 电源： | 43µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN |
| 供应商设备封装： | 8-QFN-D（2x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 2808 (CN2011-ZH PDF) |
| 其它名称： | MPR032EPR2DKR |
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MPR03X
Sensors
20
Freescale Semiconductor
8Filtering
8.1
Introduction
The MPR03X has three levels of filtering. The first and second level filters will allow the application to condition the signal for
undesired input variation. The third level filter can be configured to reject touch stimulus and be used as a baseline for touch
detection. Each level of filtering will be further described in this section.
8.2
First Level
The first level filter is designed to filter high frequency noise by averaging samples taken over short periods of time. The number
of samples can be configured to equal a set of values ranging from 6 to 34 samples. This value is set by the FFI in the AFE
Configuration Register (Section 7.4.1). The timing of this filter is also determined by the configuration of the electrode charge time
in the Filter Configuration Register (Section 8.3.1).
Note that the electrode charge time must be configured for the capacitance in the application. The resulting value will affect the
period of the first level filter.
8.3
Second Level
The second level filter is designed to filter low frequency noise and reject false touches due to inconsistent data. The number of
samples can be configured to equal a set of values ranging from 4 to 18. This value is set by the SFI in the Filter Configuration
Register (Section 8.3.1). The timing of this filter is also determined by the configuration of ESI in the Filter Configuration Register
Note that the ESI (Electrode Sample Interval) must be configured to accommodate the low power requirements of a system.
Thus, the resulting value will affect the period of the second level filter.
The raw data from the second level of filtering is output in the Filtered Data High and Filtered Data Low registers, as shown in
8.3.1
The Filter Configuration register is used to set the electrode charge/discharge time (CDT), second level filter iteration (SFI), and
electrode sample intervals (ESI). The address of the Electrode Configuration Register is 0x43.
Figure 26. Filter Configuration Register
7
6
543210
R
CDT
SFI
ESI
W
Reset:
0
100100
= Unimplemented
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPR03X | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Proximity Capacitive Touch Sensor Controller |
| MPR03X_09 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Proximity Capacitive Touch Sensor Controller |
| MPR03XEJ | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Proximity Capacitive Touch Sensor Controller |
| MPR03XEP | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Proximity Capacitive Touch Sensor Controller |
| MPR03XQ | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Proximity Capacitive Touch Sensor Controller |
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