Figure 28: External antenna power supply with full antenna supervisor (for exact pin orientation see data sheet)
2.5.5.1 Short and open circuit active antenna supervisor
The Antenna Supervisor can be configured by a serial port message (using only UBX binary message). When
enabled the active antenna supervisor produces serial port messages (status reporting in NMEA and/or UBX
binary protocol) which indicates all changes of the antenna circuitry (disabled antenna supervisor, antenna
circuitry ok, short circuit, open circuit) and shuts the antenna supply down if required.
The active antenna supervisor provides the means to check the active antenna for open and short circuits and to
shut the antenna supply off, if a short circuit is detected. The state diagram in Figure 29 applies. If an antenna is
connected, the initial state after power-up is “Active Antenna OK”.
Figure 29: State diagram of active antenna supervisor
Firmware supports an active antenna supervisor circuit, which is connected to the pin AADET_N. An example of
an open circuit detection circuit is shown in Figure 30 and Figure 31. High on AADET_N means that an external
antenna is not connected.
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