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参数资料
| 型号： | MPR084EJR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 2/40页 |
| 文件大小： | 0K |
| 描述： | IC CTLR TOUCH SENSR PROX 16TSSOP |
| 标准包装： | 1 |
| 类型： | 电容性 |
| 输入数/键： | 8 键 |
| 评估套件： | 可供 |
| 数据接口： | I²C，串行 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 电流 - 电源： | 1.62mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 剪切带 (CT) |
| 配用： | KITMPR084EVM-ND - KIT EVAL 8-PAD TOUCH MPR084 |
| 其它名称： | MPR084EJR2CT |
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MPR084
Sensors
10
Freescale Semiconductor
3
Touch Detection
3.1
Introduction
When using a capacitive touch sensor system the raw data must be filtered and interpreted. This process can be done many
different ways but the method used in the MPR084 is explained in this chapter.
3.2
Understanding the Basics
The touch pad interface has to distinguish touch status through varying user conditions (different finger sizes in bare hands or
gloves) and environmental conditions (electrical and RF noise, sensor contamination with dirt or moisture).
The touch pad circuitry reports touch status as one of the following two conditions:
1.
Touch Pad untouched
2.
Touch Pad touched on one of eight pads.
The touch pad is only touched in one position, ideally near the middle of one of the eight pads. If a touch occurs between pads,
untouched will be reported.
3.3
Conditional Output Scenarios
Since it is unlikely that in a real world case a single independent touch will occur two specific multi-touch response cases are
outlined. Methods for changing the sensitivity of the device will be discussed in another Chapter, but the important part is that the
sensitivity is determined by the strength of an input signal. If more than one input signal is above the selected sensitivity then the
touch sensor controller interprets this in a specific way. This functionality is broken down into two different cases.
3.3.1
Simultaneous Touches
Any time multiple touches are detected at the same time the touch sensor controller recognizes this case and accounts for it. The
number of allowed reported touches is settable using the Maximum Number of Touched Positions Register (Section 3.6). In the
case where this register is set to 1, all touches past the first will be ignored and unreported.
A special case is when exact 2 keys are involved in the interaction. In most cases one of the two electrodes will receive a stronger
signal than the other. If the difference in capacitance is statistically significant between the pad with the stronger signal will be
reported
This functionality is sometimes called 1-Keyed Lockout. by changing the Maximum Number of Touched Positions Register
(Section 3.6). this value can be set. Thus the n-key lockout is determined by this register.
3.3.2
Sequential Touches
Another case is when one touch pad is touched and held and a second touch pad is then touched and held. For this situation the
second touch will be ignored and the first touch will continue to be reported.
If the second touch is released before the first touch then the second touch will be completely ignored. But, if the first touch is
released before the second then the system will report that the first key is released and that the second key is now touched. This
functionality is sometimes called 2-Key Rollover.
3.4
Touch Pad Configuration Register
The Touch Pad Configuration Register configures a variety of the MPR084 features. Each of these features is described in
following sections. The I2C slave address of the Touch Pad Configuration Register is 0x03.
Figure 14. Touch Pad Configuration Register
7
6
543210
R
TPSE
0
BKA
ACE
TPRBE
TPTBE
0
TPE
W
Reset:
1
0
000001
= Unimplemented
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPR084Q | 功能描述:电容触摸传感器 4 POSITION ROTARY & RoHS:否 制造商:Microchip Technology 电源电压: 通道数量: 封装 / 箱体: 尺寸: 温度范围: |
| MPR084QR2 | 功能描述:电容触摸传感器 4 POSITION ROTARY & RoHS:否 制造商:Microchip Technology 电源电压: 通道数量: 封装 / 箱体: 尺寸: 温度范围: |
| MPR0854FPXXXZ01A | 功能描述:AC/DC CONVERTER 54V 800W 制造商:ge critical power 系列:MPR，耐火 零件状态:有效 类型:前端 输出数:1 电压 - 输入:90 ~ 264 VAC 电压 - 输出 1:54V 电压 - 输出 2:- 电压 - 输出 3:- 电压 - 输出 4:- 电流 - 输出（最大值）:14.8A 功率（W）:800W 应用:ITE（商业） 电压 - 隔离:3kV（3000V） 效率:88% 工作温度:-10°C ~ 70°C（有降额） 特性:热插拔，I2C? 接口，负载均分，PFC，PMBus?，远程开/关，遥测，待机输出，通用输入 安装类型:机架安装 大小/尺寸:8.93" 长 x 3.40" 宽 x 1.57" 高（226.8mm x 86.4mm x 39.9mm） 所需最小负载:无 认可:- 功率（W） - 最大值:800W 标准包装:5 |
| MPR106M2 | 制造商:DEARBORN ELECTRONICS INC 功能描述:CAPACITOR MILITARY FILM |
| MPR106M2S1 | 制造商:SPEC 功能描述: 制造商:Vishay Sprague 功能描述: |
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