NT1160 Datasheet, PDF (7/22 Pages) List of Unclassifed Manufacturers – The Nuvoton touch key series

NT1160
4 CAPACITIVE TOUCH KEY
4.1 Input Circuit
Each capacitive touch key needs to be connected with one resistor as shown in Figure 4-1. It is
strongly recommended that the resistor value is 390 kΩ and the capacitor value is 4.7pF. At the
same time, all the resistors need to be kept as close to sensor pad as possible during PCB layout.
Touch
Pad
CPn
4.7pF
390K
SENn
Figure 4-1 Touch Key Reference Circuit
There are two touch key driving signals (CPn) for NT1160 to operate matrix scan. One SIN pin can
distinguish two touch keys through the driving signal as shown in Figure 4-2.
Mar 12, 2016
Figure 4-2 Scanning Touch Key Reference Circuit
Page 7 of 22
Rev 1.00