Si12t and si14t low power capacitive touch chips

Low power capacitive touch chip Si12T and Si14T, Because it has touch pause detection function ,ACD（ Automatic detection card ） In mode ,Si512/522/523 adopt SCT Pin control Si12T and Si14T Touch function , The card swiping part and the touch part do not interfere with each other , Greatly reduces the chance of false triggering .

working principle

ACD( Automatic detection card ) In mode , adopt Si522A Turn on ARI function , adopt D1 Pin outputs synchronous level signal , adopt SCT Pin control Si12T/Sil4T Pause or turn on .

stay Si522A chip ACD( Auto detect card mode ) Timed interval to , Before launching card inspection field strength 1μs, chip D1 Pin output high level SCT Synchronous signal ,Si12T/Si14T stay SCT Pause the current touch sensing state at high level , After completing the field strength of launch card inspection 1us after , The chip will output low level SCT Synchronous signal ,Si12T/Si14T Turn on the current touch sensing state at low level .

The whole automatic detection card ACD（ Automatic detection card ） In mode , The time interval of emission field strength is 15us, Pause the touch function at this interval , Will not have any impact on the touch experience . Through the synchronization signal SCT, It ensures that the card swiping part and the touch part do not interfere with each other .

The main features

Si12T Fully compatible ADS Of TSM12, The software and hardware do not need to be modified .

Si14T contrast Si12T Two more channels , At the same time, it can support 14 Key functions ,Si14T and Si12T It has multi chip synchronization function .

Application field

Door lock application

Touch screen application

Control panel 、 keyboard

Thin film switch

Mobile application （ mobile phone /PDA/PMP etc. ）