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Figure 48-6. Mutual-cap sensing mode
Mutual-cap sensing includes transmitter and receiver. Under clocking, transmitter outputs
pulses which couple through mutual cap then reach receiver. Receiver amplifies the
signal and converts to charge current on integration cap Ci which creates step voltage
Vci.
The formula is given by:
,
,
where
Ci: is integration capacitance. Typical 90pF.
Vp, Vm: dual reference voltage which can be configured by DVOLT<1:0>.
Fsw: is the switching frequency which is controlled by SSC (Spread Spectrum Clocking)
block.
Tsw: is the switching period, and Tsw =1/Fsw.
t3: is the SSC output low period.
Rs: is parameter of analog front end which can be configured by M_SEN_RES<3:0>.
M: is a parameter decided by M_PMIRRORR<1:0> and M_PMIRRORL<2:0>.
∆V: is signal voltage received. It is decided by
which can be tens to hundreds of volts.
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
1302
NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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