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參數(shù)資料
| 型號： | AT42QT2161-MMU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 5/14頁 |
| 文件大小： | 0K |
| 描述： | IC TOUCH SENSOR 16KEY 28QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QMatrix™, QSlide™ |
| 類型： | 電容性 |
| 觸摸面板接口： | 8，2 線 |
| 輸入數(shù)/鍵： | 16 鍵，滑塊 |
| 分辨率（位）： | 10 b |
| 評估套件： | * |
| 數(shù)據(jù)接口： | I²C，串行 |
| 電壓基準(zhǔn)： | 內(nèi)部 |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 電流 - 電源： | 1.14mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 28-VQFN |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | AT42QT2161-MMUDKR |
13
9614A–AT42–08/10
AT42QT2161
Key sizes should be in the 5 – 7 mm range when used in the slider to get the best linearity. The
slider should be made up of however many of these elements are required to fit their
dimensions.
The slider will be treated as an object in the Adjacent Key Suppression (AKS) groupings. The
keys in the slider would normally be set to the same burst length and threshold, although
adjustments can be made in these at the expense of linearity.
3.9.2
AKS Technology and the Slider
There can be up to three AKS groups, implemented so that only one key in each group may be
reported as being touched at any one time. The AKS technique will lock onto the dominant key,
and until this key is released, other keys in the group will not be reported as in detection. This
allows a user to slide a finger across multiple keys with only the dominant key reporting touch.
Each key may be in one of the groups 1 – 3, or in group 0 meaning that it is not AKS enabled.
Keys in the slider are not able to use AKS technique against each other. This is necessary to
enable smooth scrolling. Multiple keys within the slider can be in detect at the same time,
regardless of the AKS settings. The AKS technique will, however, work against keys outside the
object or within another object. For example, if a slider is in the same AKS group as keys, then
touching anywhere on the slider will cause the AKS technique to suppress the keys. Similarly
touching the keys first will suppress the slider.
Note:
For normal operation all keys in the slider should be placed in the same AKS group.
3.10
PCB Layout, Construction
3.10.1
Overview
It is best to place the chip near the touch keys on the same PCB so as to reduce X and Y trace
lengths, thereby reducing the chances for EMC problems. Long connection traces act as RF
antennae. The Y (receive) lines are much more susceptible to noise pickup than the X (drive)
lines.
Even more importantly, all signal related discrete parts (resistors and capacitors) should be very
close to the body of the chip. Wiring between the chip and the various resistors and capacitors
should be as short and direct as possible to suppress noise pickup.
Ground planes, if used, should be placed under or around the QT chip itself and the associated
resistors and capacitors in the circuit, under or around the power supply, and back to a
connector. Ground planes can be used to shield against radiated noise, but at the expense of a
reduction in sensitivity as described previously.
Note:
When using ground planes/floods, parasitic capacitance on Y lines can lead to reduced
charge-transfer efficiency. For noise suppression, ground planes/floods can be beneficial around
and between keys on the touch side of the PCB. However, it is advisable to route Y lines on the
PCB layer furthest away from the plane/flood, to reduce parasitic capacitance. Cross-hatched
ground patterns can act as effective shields, while helping to reduce parasitic capacitance.
Ground planes/floods around the chip are generally acceptable, taking into account the same con-
siderations as for the Y line parasitics.
3.10.2
LED Traces and Other Switching Signals
Digital switching signals near the Y lines will induce transients into the acquired signals,
deteriorating the SNR performance of the device. Such signals should be routed away from the
Y lines, or the design should be such that these lines are not switched during the course of
signal acquisition (bursts).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT42QT2161-MMU QS519 | 制造商:Atmel Corporation 功能描述:QSLIDE, 16 KEY - QMATRIX SENSO |
| AT42QT2640-AU | 功能描述:Capacitive Touch Buttons, Slider, Wheel 44-TQFP (10x10) 制造商:atmel 系列:QMatrix?? 包裝:托盤 零件狀態(tài):有效 類型:按鈕，滑塊，撥輪 接近探測:無 輸入數(shù):最高 64 LED 驅(qū)動器通道:- 接口:SPI 分辨率:11 b 電壓 - 電源:4.75 V ~ 5.25 V 電流 - 電源:13mA 工作溫度:-40°C ~ 105°C 封裝/外殼:44-TQFP 供應(yīng)商器件封裝:44-TQFP（10x10） 標(biāo)準(zhǔn)包裝:160 |
| AT42QT2640-AUR | 功能描述:64 CHANNEL QMATRIX FMEA EN60730 制造商:microchip technology 系列:QMatrix?? 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:按鈕，滑塊，撥輪 接近探測:無 輸入數(shù):最高 64 LED 驅(qū)動器通道:- 接口:SPI 分辨率:11 b 電壓 - 電源:4.75 V ~ 5.25 V 電流 - 電源:13mA 工作溫度:-40°C ~ 105°C 封裝/外殼:44-TQFP 供應(yīng)商器件封裝:44-TQFP（10x10） 標(biāo)準(zhǔn)包裝:1 |
| AT42QT4120 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Patented spread-spectrum charge-transfer (transverse mode) |
| AT42QT4160 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Patented spread-spectrum charge-transfer (transverse mode) |
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