IS31SE5117 EVB User Manual
Lumissil Microsystems – www.lumissil.com
15
Rev. B, 10/25/2020
The whole interface has prompted box for each programmable parameter.
Figure 16: Set the threshold of KEY0
The address of KEY0 THRESHOLD Register is 0x30.
KEY0_TH[6:0] are the setting bits of KEY0 THRESHOLD Register (0x30).
Threshold range is from 0 to 127.
Key will be triggered when the environmental capacitance of touch key is over key threshold.
5.4
Value of KEY
As shown in Figure 20 below,
Figure 17: The VALUE of the KEY
VALUE is the current touch key value. It shows environmental capacitance if there is no object close to touch key.
The corresponding value will be display in the box when pressing KEYs (KEY0~KEY15) on EVB. The box turns
red if value is over key threshold and it means this key is triggered.
5.5
Key and interrupt enable
Figure 18 below is an example. If you want to disable KEY0, you cannot select the check box in the KEY0 column
of the IO CONFIG page. Key enable setting could shut down any touch key. If disable the KEY0 and
KEY1~KEY15 is enabled, there is no changing by touching KEY0.
Note: If KEY is set to GPIO (High) or GPIO (low) on the IO CONFIG page, the key enable setting corresponding
to KEY will also be disabled.
