31.12 Peripheral Touch Controller (PTC) Electrical Specifications

Table 31-14. Peripheral Touch Controller AC Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDDIO = AVDD = VDD 1.62V to 3.63V (unless otherwise stated)

Operating Temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
PTC_1CLOAD SC(1)Self Capacitance Mode (PTC Channel Y0 - Y15)Y015pFMaximum sensor load capacitance
Y122pF
Y218pF
Y3 - 1522pF
PTC_3CLOAD MC(1)Mutual Capacitance Mode

(PTC Channel Y0 - Y15)

29pF
PTC ANALOG GAIN SETTINGS(2)
PTC_5PTCGAIN(2, 3)Analog Gain SettingsGain_11.0
Gain_22.0
Gain_43.8
Gain_87.8
Gain_1612.8
Note:
  1. Maximum capacitive load that the PTC circuitry can compensate for each channel.
  2. Analog Gain is a parameter of the Touch Library. Refer to the “Touch Library Peripheral Touch Controller User’s Guide”.
  3. GAIN_16 and GAIN_32 settings are not recommended, otherwise the PTC measurements might get unstable.