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參數(shù)資料
| 型號： | AT42QT1070-SSU |
| 廠商： | ATMEL CORP |
| 元件分類： | 速度傳感器和接近開關 |
| 英文描述： | PROXIMITY SENSOR-CAPACITIVE, 0.6-2.6V, RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, MS-012AB, SOIC-14 |
| 文件頁數(shù)： | 6/38頁 |
| 文件大小： | 509K |
| 代理商： | AT42QT1070-SSU |
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14
9596A–AT42–10/10
AT42QT1070
LED terminals which are multiplexed or switched into a floating state, and which are within, or
physically very near, a key (even if on another nearby PCB) should be bypassed to either Vss or
Vdd with at least a 10 nF capacitor. This is to suppress capacitive coupling effects which can
induce false signal shifts. The bypass capacitor does not need to be next to the LED, in fact it
can be quite distant. The bypass capacitor is noncritical and can be of any type.
LED terminals which are constantly connected to Vss or Vdd do not need further bypassing.
3.3
PCB Cleanliness
Modern no-clean flux is generally compatible with capacitive sensing circuits.
If a PCB is reworked in any way, clean it thoroughly to remove all traces of the flux residue
around the capacitive sensor components. Dry it thoroughly before any further testing is
conducted.
3.4
Power Supply
See Section6.2 on page24 for the power supply range. If the power supply fluctuates slowly
with temperature, the device tracks and compensates for these changes automatically with only
minor changes in sensitivity. If the supply voltage drifts or shifts quickly, the drift compensation
mechanism is not able to keep up, causing sensitivity anomalies or false detections.
The usual power supply considerations with QT parts apply to the device. The power should be
clean and come from a separate regulator if possible. However, this device is designed to
minimize the effects of unstable power, and except in extreme conditions should not require a
separate Low Dropout (LDO) regulator.
It is assumed that a larger bypass capacitor (like 1 F) is somewhere else in the power circuit;
for example, near the regulator.
To assist with transient regulator stability problems, the QT1070 waits 500 s any time it wakes
up from a sleep state (in LP modes) before acquiring, to allow Vdd to fully stabilize.
CAUTION:
If a PCB is reworked in any way, it is almost guaranteed that the behavior
of the no-clean flux will change. This can mean that the flux changes from an inert
material to one that can absorb moisture and dramatically affect capacitive
measurements due to additional leakage currents. If so, the circuit can become
erratic and exhibit poor environmental stability.
CAUTION:
A regulator IC shared with other logic can result in erratic operation and is
not advised.
A single ceramic 0.1 F bypass capacitor, with short traces, should be placed very
close to the power pins of the IC. Failure to do so can result in device oscillation,
high current consumption and erratic operation.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT42QT1070-SSU QS529 | 功能描述:IC TOUCH SENSOR 7KEY 14SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:QTouch™ 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準:- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AT42QT1070-SSUR | 功能描述:IC TOUCH SENSOR 7KEY 14SOIC 制造商:microchip technology 系列:QTouch?? 包裝:Digi-Reel? 零件狀態(tài):在售 類型:按鈕 接近探測:無 輸入數(shù):最高 7 LED 驅(qū)動器通道:最高 5 接口:I2C 分辨率:- 電壓 - 電源:1.8 V ~ 5.5 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商器件封裝:14-SOIC 標準包裝:1 |
| AT42QT1085-AU | 功能描述:電容觸摸傳感器 8 Channel QTouch Haptic Sensor IC RoHS:否 制造商:Microchip Technology 電源電壓: 通道數(shù)量: 封裝 / 箱體: 尺寸: 溫度范圍: |
| AT42QT1085-AUR | 功能描述:電容觸摸傳感器 8 Channel QTouch Haptic Sensor IC RoHS:否 制造商:Microchip Technology 電源電壓: 通道數(shù)量: 封裝 / 箱體: 尺寸: 溫度范圍: |
| AT42QT1085-MU | 功能描述:電容觸摸傳感器 8 Channel QTouch Haptic Sensor IC RoHS:否 制造商:Microchip Technology 電源電壓: 通道數(shù)量: 封裝 / 箱體: 尺寸: 溫度范圍: |
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