47.4.8 PTC Characteristics

Table 47-17. Sensor Load Capacitance (1)
Symbol Mode PTC channel Max. Units
Cload Self-capacitance Y0 16 pF
Cload Self-capacitance Y1 24 pF
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
Y10
Y11
Y12
Y13
Y14
Y15
Y16
Y17
Y18
Y19
Y20
Y21
Y22
Cload Self-capacitance Y23 22 pF
Y24
Cload Self-capacitance Y25 24 pF
Y26
Y27
Y28
Y29
Y30
Y31
Cload Mutual-capacitance All 31 pF
Note:
  1. Capacitance load that the PTC circuitry can compensate for each channel.

PTC Power Consumption

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

  • Operating conditions
    • VDD = 5.0V
  • Clocks
    • OSC48M used as main clock source, running undivided at 48 MHz
    • CPU is running on Flash with 2 wait states at 48 MHz
    • PTC running at 4 MHz
  • PTC configuration
    • Mutual-Capacitance mode
    • One-touch channel
  • System configuration
    • Standby Sleep mode enabled
    • RTC running on ULP32K: 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 47-18. Power Consumption (1)
Symbol Parameters Drift Calibration PTC scan rate Oversamples Ta Typ. Max. Units
IDD Current Consumption Disabled 10 4 Max. 105°C Typ. 25°C 24 609 µA
16 43 633
50 4 17 602
16 22 608
100 4 16 601
16 19 605
200 4 16 601
16 17 603
Enabled 10 4 30 620
16 50 644
50 4 20 607
16 24 612
100 4 18 606
16 21 608
200 4 17 605
16 19 607
Note:
  1. These values are based on characterization.