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AT42QT2100 Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT42QT2100 Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 44 page  7 AT42QT2100 [DATASHEET] 9554E–AT42–01/13 2.5 Proximity Effect Any number of keys can be programmed to have hand or body proximity. By using a relatively large electrode inside the product enclosure and a larger value of CsB, the product can auto power up or activate its display with hand approach. This simple feature can add enormous sales appeal to almost any product.However, if using AKS see Section 4.3.6 on page 15. 2.6 Moisture Tolerance The presence of water (condensation, sweat, spilt water, and so on) on a sensor can alter the signal values measured and thereby affect the performance of any capacitive device. The moisture tolerance of QTouch devices can be improved by designing the hardware and fine-tuning the firmware following the recommendations in the application note Atmel AVR3002: Moisture Tolerant QTouch Design ( www.atmel.com/Images/doc42017.pdf). 2.7 SPI Interface The QT2100 is an SPI slave mode device, utilizing a four-wire full-duplex SPI interface. In addition to the standard four SPI signals (SS, SCK, MOSI and MISO), there is a DRDY (data ready) output which may optionally be used to time communications such that they do not occur during channel measurement bursts. During each burst DRDY is held low by the QT2100. After each group burst, DRDY is driven high for 500 µs or until 3 bytes have been exchanged. The QT2100 also provides a CHANGE signal to indicate when there has been a change in detection state. This removes the need for the host to poll the QT2100 continuously. On each SPI transfer the host sends three bytes to the QT2100 and the QT2100 simultaneously sends three bytes to the host. The bytes sent from the host provide the QT2100 with all its configuration information; the bytes sent from the QT2100 convey the states of the touch keys and slider or wheel. |
Similar Part No. - AT42QT2100_14 |
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Similar Description - AT42QT2100_14 |
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