r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 596

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
25. Sensor Control Unit
The sensor control unit (TSCU) is a function to control the capacitive touch electrode.
The unit measures the floating capacitance of the touch electrode connected to the measurement pin.
As shown in Figure 25.1, there exist electrostatic capacitances between the electrode and the surrounding conductors.
Because the human body is an electrical conductor, when a finger is placed close to the electrode, the value of the
floating capacitance increases.
The sensor control unit detects the increase in floating capacitance to determine whether the electrode is being touched
or not.
For details of the measurement operation principle of the unit’s capacitive touch electrode, refer to 25.4 Principle of
Measurement Operation.
Figure 25.1
R8C/3xT-A
Group
Metal enclosures, etc.
Preliminary document
Specifications in this document are tentative and subject to change.
Increased Floating Capacitance due to Presence of Finger
electrode
Touch
on the circuit board
Pattern foils, etc.,
Ground (earth)
R8C/3xT-A
Group
Metal enclosures, etc.
electrode
Touch
on the circuit board
25. Sensor Control Unit
Pattern foils, etc.,
Ground (earth)
Page 565 of 725
Finger