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参数资料
| 型号： | AT42QT1111-AU |
| 厂商： | ATMEL CORP |
| 元件分类： | 速度传感器和接近开关 |
| 英文描述： | PROXIMITY SENSOR-CAPACITIVE, 0-5V, SQUARE, SURFACE MOUNT |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MS-026ABA, TQFP-32 |
| 文件页数： | 31/50页 |
| 文件大小： | 637K |
| 代理商： | AT42QT1111-AU |
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37
9571B–AT42–08/10
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 7-16.
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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