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参数资料
| 型号： | AT42QT1111-AU |
| 厂商： | ATMEL CORP |
| 元件分类： | 速度传感器和接近开关 |
| 英文描述： | PROXIMITY SENSOR-CAPACITIVE, 0-5V, SQUARE, SURFACE MOUNT |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MS-026ABA, TQFP-32 |
| 文件页数： | 14/50页 |
| 文件大小： | 637K |
| 代理商： | AT42QT1111-AU |
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21
9571B–AT42–08/10
AT42QT1111-MU/AT42QT1111-AU
4.11
Signal Processing
4.11.1
Detection Integrator
The device features a detection integration mechanism, which acts to confirm a detection in a
robust fashion. A per-key counter is incremented each time the key has exceeded its threshold.
When this counter reaches a preset limit the key is finally declared to be touched. For example,
if the DI limit is set to 10, then a key’s signal must fall by more than the key threshold, and
remain below that level for 10 acquisitions, before the key is declared to be touched.
Similarly, the DI is applied to a key that is going out of detect: it must take 10 acquisitions where
the signal has not exceeded its detect threshold before it is declared to leave touch.
4.11.2
Burst Length Limitations
The maximum burst length is 2048 pulses. The recommended design is to use a capacitor that
gives a signal of <1000 pulses.
The number of pulses in the burst can be obtained by reading the key signal (that is, the number
of pulses to complete measurement of the key’s signal) over the SPI interface (see Section 6.8
on page 26). Alternatively, a scope can be used to measure the entire burst, and then the burst
length divided by the time for a single pulse.
Note that the keys are independent of each other. It is therefore possible, for example, to have a
signal of 100 on one key and a signal of 1000 on another.
4.11.3
Adjacent Key Suppression Technology
The device includes Atmel’s patented Adjacent Key Suppression (AKS) technology to allow the
use of tightly spaced keys on a keypad with no loss of selectability by the user.
AKS is enabled or disabled for each key individually; only one key out of those enabled for AKS
may be reported as touched at any one time. The first key touched dominates and stays in
detect until it is released, even if another stronger key is reported. Once it is released, the next
strongest key is reported. If two keys are simultaneously detected, the strongest key is reported,
allowing a user to slide a finger across multiple keys with only the dominant key reporting touch.
Each key can be enabled for AKS processing via the AKS mask (see Section 7.11 on page 33).
Keys outside the group of enabled keys may be in detect simultaneously.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT42QT1111-AU QS383 | 制造商:Atmel Corporation 功能描述:QTOUCH 11 KEY TOUCH SENSOR IC |
| AT42QT1111MU | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:QTouch? 11-key Sensor IC |
| AT42QT1111-MU | 功能描述:电容触摸传感器 QTouch 11 Key Touch Sensor IC 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: |
| AT42QT1111-MU QS384 | 制造商:Atmel Corporation 功能描述:QTOUCH 11 KEY TOUCH SENSOR IC |
| AT42QT1244-AU | 功能描述:电容触摸传感器 QMatrix FMEA 24 Key Sensor IC 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: |
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