STM8T141 datasheet(33/50 Pages) STMICROELECTRONICS

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STM8T141

Electrical characteristics

Doc ID 15699 Rev 7

33/50

9.5

Capacitive sensing characteristics

Table 16.

General capacitive sensing characteristics(1)

Values guaranteed by design.

Symbol

Parameter

Min.

Typ.

Max.

Unit

fTRANSFER

Charge-transfer frequency at 125-kHz

setting

125

160

kHz

Charge-transfer frequency at 250-kHz

setting

185

250

315

tSAMPLING

Scanning period at 10-ms setting

7.5

12.5

Scanning period at 20-ms setting

tLP

Low Power

4 tSAMPLING

Extreme Low Power

16 tSAMPLING

tELP

Time before switching back to Low

Power mode

540

tRFT

(2)

See tRFT in Figure 9: Reference freeze timeout.

15 s reference freeze timeout

45 s reference freeze timeout

tBURST

Burst detection

214

tTRANSFER

DDC

Detection debounce count

Counts

EDDC

End of detection debounce count

DTh

(3)

Reference value (Ref.) described in Section 5.3.3: Debounce filter on page 16.

Proximity detection threshold

– 8

Counts

Sensitive proximity detection threshold

– 2

Touch detection threshold

Ref./16

Sensitive touch detection threshold

Ref./32

(4)

Between 3 V and 3.5 V,



evolves as shown in Figure 23.

Power supply rejection ratio VDDMIN <

VDD < 3 V)

0.0250

Count/V

Power supply rejection ratio (3.5 V < VDD

< VDDMAX)

0.0005

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