Cm, Cs: are the mutual capacitance and parasitic capacitance of sensor.
If the touch sensor intrinsic sensitivity is limited due to parasitic, sensitivity boost feature
can be activated by setting M_SEN_BOOST<4:0>. The basis average charge current will
be subtracted by boost current which enlarge the signal current.
Example
In one typical case, ∆V=100 mV, Rs=10k, Vp-Vm=1 V, Ci=90 pF, M_PMIRRORL=8,
M_PMIRRORR= M_NMIRROR= 2, Tsw=1 μs, t3=0.25 μs.
NSTEP=144, TNSTEP=144 μs.
Dec=8, Order=2, TSICNT=144 × 64 = 9216, SCANTIME=144 μs × 8 × 2 = 2304 μs.
NOTE
Keep M_PMIRRORR and M_NMIRROR the same.
48.5.5 Enable TSI module
The TSI module can be fully functional in run, wait and low power modes. The
TSI_GENCS[TSIEN] bit must be set to enable the TSI module in run and wait mode.
When TSI_GENCS[STPE] bit is set, it allows the TSI module to work in low power
mode.
48.5.6 Software and hardware trigger
The TSI module allows a software or hardware trigger to start a scan. When a software
trigger is applied ( TSI_GENCS[STM] bit clear), the TSI_DATA[SWTS] bit must be
written "1" to start the scan electrode channel that is identified by TSI_DATA[TSICH].
When a hardware trigger is applied ( TSI_GENCS[STM] bit set), the TSI will not start
scanning until the hardware trigger arrives. The hardware trigger is different depending
on the MCU configuration. Generally, it could be an event that RTC overflows. See chip
configuration section for details.
Chapter 48 Touch Sensing Input (TSI)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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