NXP Semiconductors K32 L2A Series, Reference Manual, Page: 1285 / 1379

49.4.13.2 Single threshold noise modes
These modes reset by MODE[3:2]=01 and 10. The difference between these two modes
is that in mode 2 (MODE[3:2]=10) there is a frequency limitation circuit that enables the
circuit to operate in higher frequencies. In mode 1 (MODE[3:2]=01) this frequency
limitation circuit is not enabled.
In this mode the thresholds are set by user via register bits as described in the following
table.
During these modes the internal oscillator rails are set to the maximum (equivalent to
DVOLT[1:0]=00).
Table 49-5. Signal properties in single noise modes (1,2)
Name Function I/O type Power up / reset
MODE[3:2] 01 or 10- Single thrshold
noise mode operation. I 00
DVOLT[1:0], EXTCHRG[2:1] In this operation mode these 4
bits are used select the noise
threshold.
0000 - DVpm = 0.038 V, Vp =
0.834 V, Vm = 0.796 V
0001 - DVpm = 0.050 V, Vp =
0.830 V, Vm = 0.790 V
0010 - DVpm = 0.066 V, Vp =
0.848 V, Vm = 0.782 V
0011 - DVpm = 0.087 V, Vp =
0.858 V, Vm = 0.772 V
0100 - DVpm = 0.114 V, Vp =
0.872 V, Vm = 0.758 V
0101 - DVpm = 0.150 V, Vp =
0.890 V, Vm = 0.740 V
0110 - DVpm = 0.197 V, Vp =
0.914 V, Vm = 0.716 V
0111 - DVpm = 0.260 V, Vp =
0.945 V, Vm = 0.685 V
1000 - DVpm = 0.342 V, Vp =
0.986 V, Vm = 0.644 V
1001 - DVpm = 0.450 V, Vp =
1.040 V, Vm = 0.590 V
1010 - DVpm = 0.592 V, Vp =
1.111 V, Vm = 0.519 V
1011 - DVpm = 0.780 V, Vp =
1.205 V, Vm = 0.425 V
1100 - DVpm = 1.026 V, Vp =
1.328 V, Vm = 0.302 V
I XXXX
Table continues on the next page...
Chapter 49 Touch Sensing Input (TSI)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 1285