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| 型号： | KITMPR03XEVM |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 32/33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
8
Freescale Semiconductor
3
Functional Overview
3.1
Introduction
The MPR03X has an analog front, a digital filter, and a touch recognition system. This data interpretation can be done many
different ways but the method used in the MPR03X is explained in this chapter.
3.2
Understanding the Basics
MPR03X is a touch pad controller which manages two or three touch pad electrodes. An IC interface communicates with the
host, and an optional interrupt output advises the host of electrode status changes. The interrupt output is a multiplexed function
with the third electrode input, so using the interrupt output reduces the number of electrode inputs to two.
The primary application for MPR03X is the management of user interface touch pads. Monitoring touch pads involves detecting
small changes of pad capacitance. MPR03X incorporates a self calibration function which continually adjusts the baseline
capacitance for each individual electrode. Therefore, the host only has to configure the delta thresholds to interpret a touch or
release.
MPR03X uses a state machine to operate a capacitive measurement engine to analyze the electrodes and determine whether a
pad has been touched or released. Between measurements the MPR03X draws negligible current. The application controls
MPR03X's configuration, making trade-offs between noise rejection, touch response time, and power consumption.
3.3
Implementation
The touch sensor system can be tailored to specific applications by varying the following: a capacitance detector, a raw data low
pass filter, a baseline management system, and a touch detection system. In the following sections, the functionality and
configuration of each block will be described.
Electrodes can be connected to the MPR03X in two different configurations, one with an IRQ and one without (Figure 13).
Figure 13. MPR03X Pad and Interrupt Connection Options
1
2
3
ELE0
ELE1
ELE2
Interface
IC Serial
VSS
SDA
SCL
MPR03X
ELE0
ELE1
VDD
INT
1
2
SDA
SCL
MPR03X
VDD
Interface
IC Serial
VSS
75k
REXT
VSS
75k
REXT
MPR03X with 2 Electrodes and 2 Pads
MPR03X with 3 Electrodes and 3 Pads
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