Link switch

The link switch input (LINK\_SW) can be used to interface with a momentary (monostable) closing push button to facilitate a simple user interface. This is an alternative to using the SPI interface to integrate into a host device's menu system.

This signal shall be pulled to VDD using an external 4.7kΩ-10kΩ resistor to ensure proper function.

The switch input has several functions, among others to controlling the radio link or to force driver update mode. Please see the table below for details about the functions of the switch input:

The functions of the link switch button are available through SPI or via the CRMX Toolbox app, and can many times be recommended over using the link switch button for a more user friendly integration. But for minimal integrations, the functions can be used via the switch.

Function Conditions
Link Pull signal low (button pressed) for 0.1-1 second. (Only in TX mode.)
Unlink Hold signal low (button pressed) for >3 seconds.
Force firmware update mode Hold signal low (button pressed) during power on.
Toggle Bluetooth on/off  Short push (0.1-1s) followed by long push (>3s).
Change TX protocol 3x short push (0.1-1s) followed by long push (>3s).
Change RX/TX mode 5x short push (0.1-1s) followed by long push (>3s).
Reset PIN code  7x short push (0.1-1s) followed by long push (>3s).
Enable/disable proxy 9x short push (0.1-1s) followed by long push (>3s). (Only in TX mode, with license.)