ELSEMA
433MHz Keyring Remote with Frequency Hopping – PCK Series
KEYRING DIMENSIONS
THEORY OF OPERATION
The microcontroller upon detecting an active tact switch input, reads the setting of the 12-way dipswitch. The
active input and the dipswitch data is then sent to the RF IC. The RF IC sends the frequency modulated (FM)
carrier to the PCB antenna via the LC filter and antenna matching.
BLOCK DIAGRAM
