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參數(shù)資料
| 型號： | AT42QT2161-MMU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 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 |
11
9614A–AT42–08/10
AT42QT2161
Dwell time is the duration in which charge coupled from X to Y is captured (Figure 3-4
on page 10). Increasing Rx values will cause the leading edge of the X pulses to increasingly roll
off, causing the loss of captured charge (and hence loss of signal strength) from the keys.
The dwell time is a minimum of 250 ns. If the X pulses have not settled within 250 ns, key gain
will be reduced; if this happens, either the stray capacitance on the X line(s) should be reduced
(by a layout change, for example by reducing X line exposure to nearby ground planes or
traces), or, the Rx resistor needs to be reduced in value (or a combination of both approaches).
One way to determine X line settling time is to monitor the fields using a patch of metal foil or a
small coin over the key (Figure 3-5). Only one key along a particular X line needs to be
observed, 250 ns dwell time should exceed the observed 95 percent settling of the X-pulse by
25 percent or more.
In almost all cases, Ry should be set equal to Rx, which will ensure that the charge on the Y line
is fully captured into the Cs capacitor.
Figure 3-5.
Probing X-Drive Waveforms With a Coin
3.8
Key Design
Circuits can be constructed out of a variety of materials including conventional FR-4, Flexible
Printed Circuit Boards (FPCB), silver silk-screened on PET plastic film, and even inexpensive
punched single-sided CEM-1 and FR-2.
The actual internal pattern style is not as important as the need to achieve regular X and Y
widths and spacings of sufficient size to cover the desired graphical key area or a little bit more;
~3 mm oversize is acceptable in most cases, since the key’s electric fields drop off near the
edges anyway. The overall key size can range from 6 mm x 6 mm up to 100 mm x 100 mm but
these are not hard limits. The keys can be any shape including round, rectangular, square, etc.
The internal pattern can be interdigitated as shown in Figure 3-6.
For small, dense keypads, electrodes such as shown in the lower half of Figure 3-6 can be used.
Where the panels are thin (under 2 mm thick) the electrode density can be quite high.
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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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