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AT42QT1111-MU Datasheet(PDF) 37 Page - ATMEL Corporation |
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AT42QT1111-MU Datasheet(HTML) 37 Page - ATMEL Corporation |
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37 / 50 page  37 9571A–AT42–02/10 AT42QT1111-MU/AT42QT1111-AU 7.17 Addresses 31–41: Negative Drift Compensation (NDRIFT)/Negative Recalibration Delay (NRD) KEY_n_NDRIFT: the negative drift compensation for key n (where n is 0–10). When changing ambient conditions cause a change in the key signal, the QT1111 will compensate through its drift functions. “Negative Drift” refers to the case where the signal for a key is lower than the reference. Drift compensation occurs at a rate of 1 count per drift compensation period. The entered number is a multiple of 320 ms. Note that as a key touch, or an approaching touch, naturally causes a negative change in the signal, negative drift should be carried out at a much slower rate than positive drift. Otherwise, a slowly approaching finger will not cause a touch detection, as the falling signal could be compensated through the negative drift mechanism. Note: Drift compensation timing is paused while Drift Hold is activated, and continues when Drift Hold has timed out. KEY_n_NRD: the negative recalibration delay for key n (where n is 0–10). In order to avoid a situation where a key remains “stuck” in detect due to, for example, changing environmental conditions, the “Negative Recalibration Delay” sets an upper limit on how long a key can remain “touched”. When this time is exceeded, the QT1111 (that is, all keys) is recalibrated, taking this key (and any others which are in detect) out of detection. This delay is set in a multiple of 2560 ms. Note: A setting of “0” disables the NRD Timeout. Default KEY_n_NDRIFT value: 7 (2240 ms) Default KEY_n_NRD value: 10 (25.6 seconds) Table 7-17. Negative Drift Compensation/Negative Recalibration Delay Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 31 KEY_0_NDRIFT KEY_0_NRD 32 KEY_1_NDRIFT KEY_1_NRD 33 KEY_2_NDRIFT KEY_2_NRD 34 KEY_3_NDRIFT KEY_3_NRD 35 KEY_4_NDRIFT KEY_4_NRD 36 KEY_5_NDRIFT KEY_5_NRD 37 KEY_6_NDRIFT KEY_6_NRD 38 KEY_7_NDRIFT KEY_7_NRD 39 KEY_8_NDRIFT KEY_8_NRD 40 KEY_9_NDRIFT KEY_9_NRD 41 KEY_10_NDRIFT KEY_10_NRD |
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