Figure 31: Schematic of open circuit detection variant B (for exact pin orientation see data sheet)
The open circuit supervisor circuitry shown in Figure 31 has a quiescent current of approximately 2mA.
This current can be reduced with an advanced circuitry such as shown in Figure 30.
References Value Tolerance Description Remarks
C1 2.2 µF
± 10%
Capacitor, X7R, min 10 V
C2 100 nF
± 10%
Capacitor, X7R, min 10 V
FB1
600 Ω
Ferrite Bead e.g. Murata BLM18HD601SN1
R1
15 Ω ± 10%
Resistor, min 0.063 W
R2
10 Ω ± 10%
Resistor, min 0.250 W
R3, R4
10 kΩ ± 10%
Resistor, min 0.063 W
R5
33 kΩ ± 10%
Resistor, min 0.063 W
T1, T2 PNP Transistor BC856B e.g. Philips Semiconductors
7
Table 8: Active antenna supervisor, bill of material
Status reporting
At startup and on every change of the antenna supervisor configuration the u-blox 6 GPS/GALILEO module will
output a NMEA ($GPTXT) or UBX (INF-NOTICE) message with the internal status of the antenna supervisor
(disabled, short detection only, enabled).
None, one or several of the strings below are part of this message to inform about the status of the active
antenna supervisor circuitry (e.g. “ANTSUPERV= AC SD OD PdoS”).
7
Transistors from other suppliers with comparable electrical characteristics may be used.
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