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AT42QT1011 Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT42QT1011 Datasheet(HTML) 5 Page - ATMEL Corporation |
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5 / 18 page  5 9542G–AT42–03/10 AT42QT1011 Figure 3-1. Fast Mode Bursts (SYNC Held High) 3.1.3 Low Power Mode The QT1011 runs in Low Power (LP) mode if the SYNC pin is held low. In this mode it sleeps for approximately 80 ms at the end of each burst, saving power but slowing response. On detecting a possible key touch, it temporarily switches to Fast mode until either the key touch is confirmed or found to be spurious (via the detect integration process). It then returns to LP mode after the key touch is resolved, as shown in Figure 3-2 on page 5. Figure 3-2. Low Power Mode (SYNC Held Low) 3.1.4 SYNC Mode It is possible to synchronize the device to an external clock source by placing an appropriate waveform on the SYNC pin. SYNC mode can synchronize multiple QT1011 devices to each other to prevent cross-interference, or it can be used to enhance noise immunity from low frequency sources such as 50Hz or 60Hz mains signals. The SYNC pin is sampled at the end of each burst. If the device is in Fast mode and the SYNC pin is sampled high, then the device continues to operate in Fast mode (Figure 3-1 on page 5). If SYNC is sampled low, then the device goes to sleep. From then on, it will operate in SYNC mode (Figure 3-2). Therefore, to guarantee entry into SYNC mode the low period of the SYNC signal should be longer than the burst length (Figure 3-3 on page 6). SNSK SYNC ~1ms SNSK Sleep Fast detect integrator OUT ~80 ms SYNC Sleep Sleep |
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