R01UH0823EJ0100 Rev.1.00 Page 1515 of 1823
Jul 31, 2019
RX23W Group 43. Capacitive Touch Sensing Unit (CTSU)
43.3.2 Measurement Modes
The CTSU supports self-capacitance and mutual capacitance methods. Figure 43.8 illustrates these methods.
Figure 43.8 Overview of Self-Capacitance Method and Mutual Capacitance Method
In the self-capacitance method, a single touch pin is allocated to a single touch key to measure individual electrostatic
capacitance when a finger is in close proximity. In this method, single scan and multi-scan can be used as measurement
modes.
In the mutual capacitance method, the capacitance between two opposite electrodes (transmit and receive pins) is
measured.
Key 1 Key 2
Key 3 Key 4 Key 5
Touch key arrangement for
self-capacitance method
TS0 TS1 TS2
TS3
TS4
TS5
Receive pin
Transmit pin
Touch sensor arrangement for
mutual capacitance method
Touch key
TS1 TS2 TS3 TS4
TS5 TS6
To Next Page
Loading...
Need help?
General
