Table 1. PTC Acquisition Clock
Symbol |
Description |
Min |
Max |
Units |
FPTC_ACQ |
PTC Acquisition Clock |
- |
8 |
Mhz |
Table 2. Sensor Load Capacitance
(1)
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 |
Notes:
- 1.These values are based on characterization. They are not covered in test limits
in production.
- 2.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.
- 3.Capacitance load, the PTC
circuitry, can compensate for each channel.
Table 3. Analog Gain Settings (1)
(2)
Symbol |
Setting |
Average |
Gain |
GAIN_1 |
1.0 |
GAIN_2 |
2.0 |
GAIN_4 |
3.9 |
GAIN_8 |
8.1 |
Notes:
- 1.Analog Gain is a parameter of the QTouch Library. Refer to the QTouch Library
Peripheral Touch Controller User Guide.
- 2.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
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.
Table 4. Power Consumption (1)
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:
- 1.These values are based on
characterization. They are not covered in test limits in production.