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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： | 26/50页 |
| 文件大小： | 637K |
| 代理商： | AT42QT1111-AU |
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32
9571B–AT42–08/10
AT42QT1111-MU/AT42QT1111-AU
PHYST: positive hysteresis. This setting provides a greater degree of control over the
implementation of the positive threshold recalibration. The positive hysteresis operates as a
“modifier” for the positive threshold. When a key signal is detected as being over the positive
threshold, the positive threshold is reduced by a factor corresponding to the positive hysteresis
so that the key will not go in and out of positive detection when the signal is on the borderline
between drift-compensation of a positive error or recalibration.
The settings for positive hysteresis are:
00 = No change to positive threshold
01 = 12.5 percent reduction in positive-detect threshold
10 = 25% reduction in positive-detect threshold
11 = 37.5% reduction in positive-detect threshold
Default PTHR value:
4 (4 counts above reference)
Default PHYST value:
2 (25% positive hysteresis)
7.8
Address 4: Positive Drift Compensation (PDRIFT)
When changing ambient conditions cause a change in the key signal, the QT1111 will
compensate through its drift functions. “Positive Drift” refers to the case where the signal for a
key is greater than the reference.
Drift compensation occurs at a rate of 1 count per drift compensation period.
PDRIFT: the drift compensation period, in multiples of 160 ms. The valid range is 0 to 127,
where 0 disables positive drift compensation.
Note:
Drift compensation timing is paused while Drift Hold is activated, and continued when
Drift Hold has timed out.
Default value:
6 (960 ms)
7.9
Address 5: Positive Recalibration Delay (PRD)
If a key signal is determined to be above the positive threshold, the QT1111 will wait for this
delay and confirm that the error condition is still present before initiating a recalibration.
PRD: the positive recalibration delay, in multiples of 160 ms.
Note:
All keys are recalibrated in the case of a positive recalibration.
Default value:
6 (960 ms)
Table 7-6.
Positive Drift Compensation
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
40
PDRIFT
Table 7-7.
Positive Recalibration Delay
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
5PRD
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