Link switch and Antenna selector
Link switch input¶
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 two functions: controlling the radio link or to force driver update mode. Please see the table below for details about the functions of the switch input.
|Link||Only for transmitters. Pull signal low (button pressed) for 0.1-1 second.|
|Unlink||Hold signal low (button pressed) for >3 seconds.|
|Force driver update mode||Hold signal low (button pressed) during power on.|
The antenna selection input can be used to select the required RF antenna for use on TiMo. This pin is internally pulled high, meaning the External U.FL/IPEX connector is the default option. This pin can be overridden by writing to the ANTENNA register. See page 19 for details.
|High Level (Logical 1)||External U.FL/IPEX connector (default)|
|Low Level (Logical 0)||Internal Chip Antenna|