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Link switch and Antenna selector

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.

Function Conditions
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.

Antenna selection

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.

Function Conditions
High Level (Logical 1) External U.FL/IPEX connector (default)
Low Level (Logical 0) Internal Chip Antenna