47.4.7 Peripheral Touch Controller (PTC) Characteristics

Power Consumption

The values in the Power Consumption table below are measured values of power consumption under the following conditions:

Operating Conditions

  • VDD = 3.3V

Clocks

  • OSC16M divided to 4MHz used as main clock source
  • CPU is running on Flash with 0 wait state, at 4MHz
  • PTC Acquisition Clock (FPTC_ACQ) at 4MHz
  • Voltage Regulator mode: LPEFF enabled

PTC Configuration

  • Mutual-Capacitance mode
  • One touch channel

System Configuration

  • Standby Sleep mode enabled
  • RTC running on OSCULP32K: used to define the PTC scan rate, through the event system
  • Drift Calibration disabled: no interrupts, PTC scans are performed in Standby mode
  • Drift Calibration enabled: RTC interrupts (wake-up) the CPU to perform PTC scans. PTC drift calibration is performed every 1.5 sec.
Table 47-15. Power Consumption (1)
Symbol Parameters Drift Calibration PTC scan rate (msec) Oversamples Ta Typ. Max. Units
IDD Current Consumption Disabled 10 4 Max 125°C Typ 25°C 6.2 292.0 µA
16 12.7 300.5
50 4 2.3 286.1
16 3.7 290.3
100 4 1.7 286.1
16 2.4 286.2
200 4 1.4 285.5
16 1.8 286.2
Enabled 10 4 8.3 293.9
16 14.2 304.9
50 4 3.0 289.2
16 4.8 290.5
100 4 2.3 289.2
16 2.8 289.5
200 4 1.9 287.9
16 2.4 289.0
Note:
  1. These values are based on characterization. They are not covered in test limits in production.