STM8T143 datasheet(43/65 Pages) STMICROELECTRONICS

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STM8T143

Electrical characteristics

tRECAL

Time after recalibration before optimal device

sensitivity (see Section 6: Device operation).

Note: this value depends on the signal variation

including noise level

-354

tSAMPLING

tSU

Device startup time(5)

-51

DDC

Detection debounce count (touch)

Detection debounce count (proximity)

EDDC

End of detection debounce count (touch)

End of detection debounce count (proximity)

VCXL

Low state voltage value on CX during burst

0.6

Vtrip

Acquisition reference voltage

0.8

1. Min and max values for fTRANSFER are given for a 3 V to 5.5 V operating range.

2. If Data streaming mode is activated, tSAMPLING is increased by the data frame period. Please refer to Section 9.6:

Streaming mode characteristics.

3. tAET depends on the CX capacitance value. This typical value is given for an electrode of 18 pF

4. Response time for detection depends on the event occurrence time during the acquisition period, the threshold settings,

and the signal strength.

5. The device startup time is the time after power-up before any possible actuation.

Table 16. General capacitive sensing characteristics (continued)

Symbol

Parameter

Min

Typ

Max

Unit

Table 17. Internal CS value

Internal sampling capacitor selection bits (ICS)

CS capacitance value (nF)

ICS2(1)

1. This bit is also used for EPCC selection. Please refer to Table 18: Implemented EPCC values (pF).

ICS1

ICS0

Typ

000

1.5

001

010

011

100

4.5

101

110

111

17.5

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