46.11.9 Peripheral Touch Controller (PTC) Characteristics
Symbol | Description | Min | Max | Units |
---|---|---|---|---|
FPTC_ACQ | PTC Acquisition Clock | - | 8 | Mhz |
Symbol | Mode | PTC channel | Min PCB External (2) | Max Sensor Load (3) | Units |
---|---|---|---|---|---|
Cload | Self-capacitance | Y0 | 5 | 54 | pF |
Y1 | - | ||||
Y2 | - | 50 | |||
Y3 | 5 | 54 | |||
Y4 | 5 | ||||
Y5 | - | ||||
Y6 | 5 | ||||
Y7 | 5 | ||||
Y8 | 5 | ||||
Y9 | 5 | ||||
Y10 | - | 45 | |||
Y11 | 5 | 54 | |||
Y12 | 5 | ||||
Y13 | - | ||||
Y14 | - | ||||
Y15 | 5 | 50 | |||
Y16 | 5 | 54 | |||
Y17 | 5 | ||||
Y18 | 5 | ||||
Y19 | 5 | ||||
Mutual-capacitance | All | - | 31 |
Note:
- These values are based on characterization. They are not covered in test limits in production.
- Minimum external capacitance must be added on PCB design per PTC channel. Ensure that the PCB and sensor design add enough parasitic capacitance on each PTC channel, otherwise, an external capacitor must be added.
- Capacitance load, the PTC circuitry, can compensate for each channel.
Symbol | Setting | Average |
---|---|---|
Gain | GAIN_1 | 1.0 |
GAIN_2 | 2.0 | |
GAIN_4 | 3.9 | |
GAIN_8 | 8.1 |
Note:
- Analog Gain is a parameter of the QTouch Library. Refer to the QTouch Library Peripheral Touch Controller User Guide.
- These values are based on characterization. They are not covered in test limits in production.
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 (wakeup) the CPU to perform PTC scans. PTC drift calibration is performed every 1.5 sec.
Symbol | Parameters | Drift Calibration | PTC scan rate (msec) | Oversamples | Ta | Typ. | Max. | Units |
---|---|---|---|---|---|---|---|---|
IDD | Current Consumption | Disabled | 10 | 4 | Max. 85°C Typ. 25°C | 6.2 | 49.2 | µA |
16 | 12.7 | 58.1 | ||||||
50 | 4 | 2.3 | 43.7 | |||||
16 | 3.7 | 45.5 | ||||||
100 | 4 | 1.7 | 43.2 | |||||
16 | 2.4 | 43.9 | ||||||
200 | 4 | 1.4 | 42.8 | |||||
16 | 1.8 | 43.2 | ||||||
Enabled | 10 | 4 | 8.3 | 51.7 | ||||
16 | 14.2 | 60.5 | ||||||
50 | 4 | 3.0 | 44.8 | |||||
16 | 4.8 | 47.0 | ||||||
100 | 4 | 2.3 | 44.5 | |||||
16 | 2.8 | 45.4 | ||||||
200 | 4 | 1.9 | 43.9 | |||||
16 | 2.4 | 44.2 |
Note:
- These values are based on characterization. They are not covered in test limits in production.