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| 型号： | KITMPR03XEVM |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 11/33页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MPR03X |
| 产品培训模块： | MPR03x - Low-Power Proximity Sensors |
| 视频文件： | KITMPR03XEVM |
| 标准包装： | 1 |
| 传感器类型： | 触摸，电容式 |
| 接口： | I²C |
| 电源电压： | 1.71 V ~ 2.75 V |
| 嵌入式： | 是，其它 |
| 已供物品： | 4 个板，线缆，CD，样品 IC |
| 已用 IC / 零件： | MPR031 |
| 产品目录页面： | 2808 (CN2011-ZH PDF) |
| 相关产品： | MPR031EPR2DKR-ND - IC CTLR TOUCH SENSOR 8-DFN MPR031EPR2CT-ND - IC CTLR TOUCH SENSOR 8-DFN MPR031EPR2TR-ND - IC CTLR TOUCH SENSOR 8-DFN |
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MPR03X
Sensors
Freescale Semiconductor
19
7.4
Configuration
From the implementation above, there are two elements that can be configured to yield a wide range of capacitance readings
ranging from 0.455 pF to 2874.39 pF. The two configurable components are the electrode charge current and the electrode
charge time.
The electrode charge current can be configured to equal a range of values between 1
A and 63 A. This value is set in the CDC
in the AFE Configuration register (Section 7.4.1).
The electrode charge time can be configured to equal a range of values between 500 ns and 32
S. This value is set in the CDT
in the Filter Configuration Register (Section 8.3.1).
7.4.1
The AFE (Analog Front End) Configuration Register is used to set both the Charge/Discharge Current and the number of samples
taken in the lowest level filter. The address of the AFE Configuration Register is 0x41.
Figure 25. AFE Configuration Register
7
6
543210
R
FFI
CDC
W
Reset:
0
010000
= Unimplemented
Table 12. AFE Configuration Register Field Descriptions
Field
Description
7:6
FFI
First Filter Iterations – The first filter iterations field selects the number of samples
taken as input to the first level of filtering.
00 Encoding 0 – Sets samples taken to 6
01 Encoding 1 – Sets samples taken to 10
10 Encoding 2 – Sets samples taken to 18
11 Encoding 3 – Sets samples taken to 34
5:0
CDC
Charge Discharge Current – The Charge Discharge Current field selects the
supply current to be used when charging and discharging an electrode.
000000 Encoding 0 – Disables Electrode Charging
000001 Encoding 1 – Sets the current to 1uA
~
111111 Encoding 63 – Sets the current to 63uA
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