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AT42QT2100 Datasheet(PDF) 18 Page - ATMEL Corporation |
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AT42QT2100 Datasheet(HTML) 18 Page - ATMEL Corporation |
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18 / 44 page  18 AT42QT2100 [DATASHEET] 9554E–AT42–01/13 Sleep mode is a special case of LP mode, where the sleep duration between bursts is infinite. All comments concerning LP mode, including about SPI communications, apply equally to Sleep mode, except that the LPB bit is ignored and bursts are always generated after an SPI transfer or SS wake pulse as if LPB = 1. Note: In Sleep mode the QT2100 only performs acquisition bursts following being woken by SS. This has two effects: Touch detection only occurs following SS-wake pulses, and hence CHANGE can only go high at that time. The QT2100 cannot drift its internal references unless the host sends periodic SS-wake pulses. If the host does not do this, then it should command the QT2100 to recalibrate when it sets the QT2100 into a different operating mode. This mode can be used by the host to create its own LP Mode timings via the SS wakeup pulse method. 4.4.5 Sync Mode This mode is useful for low frequency noise suppression, for example from mains frequencies in line-operated appliances. Acquisition bursts are synchronized to the SS-wake pulses from the host. Sync mode is very similar to LP Mode 4, with two differences: It does not operate as in Free Run mode when a touch is first detected The LPB bit is ignored and a burst is always generated after each SS wakeup or SPI transfer as if LPB = 1 Not operating as in Free Run mode when a touch is first detected (before DI confirmation has taken place) means that acquisition bursts are restricted to the immediate time after a sync signal (SS), heightening the effect of low frequency noise suppression. In many applications of Sync mode the DI filter will need to be set to two counts, to avoid the QT2100 response time being unacceptably lengthened as a consequence of this. |
Similar Part No. - AT42QT2100_14 |
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Similar Description - AT42QT2100_14 |
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