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)
SymbolParametersDrift CalibrationPTC scan rate (msec)OversamplesTaTyp.Max.Units
IDDCurrent Consumption Disabled104Max 125°C Typ 25°C6.2292.0µA
1612.7300.5
5042.3286.1
163.7290.3
10041.7286.1
162.4286.2
20041.4285.5
161.8286.2
Enabled1048.3293.9
1614.2304.9
5043.0289.2
164.8290.5
10042.3289.2
162.8289.5
20041.9287.9
162.4289.0
Note:
  1. These values are based on characterization. They are not covered in test limits in production.