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Figure 51-32. Dual electrode capacitance measurement
51.7.1.1 TSI electrode oscillator
The TSI electrode oscillator circuit is illustrated in the following figure. A configurable
constant current source is used to charge and discharge the external electrode
capacitance. A buffer hysteresis defines the oscillator delta voltage. The delta voltage
defines the margins of high and low voltage which are the reference input of the
comparator at different times.
Functional description
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
1428
Preliminary
Freescale Semiconductor, Inc.
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