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V1.0 – Feb-12

User’s Manual

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10.7 Antenna Status Adaptation

This chapter shall give assistance in designing a circuit for detecting if an active

antenna is connected to the module. The information about the antenna status can

be derived from the ANTSTAT signal generated by this circuit. The examples use

values for components that roughly result in the following ANTSTAT output:

 Logic low when: Iant < 9mA

 Logic high when: 9mA > Iant < 16mA

 Logic low when: Iant > 16mA

10.7.1 Antenna Sensor

The following circuit is a proposal on how you can feed an antenna with 3.3V and

provide an output for the ANTSTAT pin. The value of the components may need an

adaptation in the final application. For example, the input current of the chosen

comparator goes into that equation. The thresholds defined in this circuit are quite

close to the ones described above. Their value is determined by resistors R4, R5,

and R3.

We strongly recommend simulating and testing the GPS receiver integrated in your

product design before implementing the finalized product in the appropriate market

application.

Figure 12: Application note: Antenna sensor adaptation

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Maestro A2200-A Bedienungsanleitung Seite 30