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STM8T141 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện STM8T141
Giải thích chi tiết về linh kiện  Single-channel capacitive sensor for touch or proximity detection with shielded sensing electrode
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STM8T141 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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Device operation
STM8T141
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Doc ID 15699 Rev 7
7.2.4
30-second latch
Upon the detection of an actuation, the TOUT/POUT pin will latch high. After 30 seconds
from when the actuation stops, the TOUT/POUT pin will go low.
If the TOUT/POUT pin is high and another actuation occur before the 30 seconds has
expired, the counter will reset and only 30 seconds after the new actuation has stopped, will
the TOUT/POUT pin go low. Figure 15 illustrates this output operation.
Figure 15.
30-second latch mode output operation
7.3
Detection threshold
The user has a choice between four detection threshold levels (DTh) at which the touch or
proximity detection condition is triggered. This depends on which threshold configuration is
selected. See Table 7 for more details regarding the detection threshold selections.
Bits [5:4] of option byte OPT0 are used to select the correct detection threshold levels.
Table 7.
Detection thresholds
Sensitivity
DTh setting
Description
Most sensitive
Least sensitive
Sensitive proximity threshold
Proximity for battery-powered applications.
Standard proximity threshold
Proximity with good ground. Contact through
3 mm acrylic glass and no ground.
Sensitive touch threshold
Contact through thin acrylic glass with battery
application.
Standard touch threshold
Contact through thin dielectric with good ground.



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