STM8T141 datasheet(22/50 Pages) STMICROELECTRONICS

22 / 50 page

Device operation

STM8T141

22/50

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.

STM8T141 Datasheet(PDF) 22 Page - STMicroelectronics