LEA-6 / NEO-6 - Hardware Integration Manual
GPS.G6-HW-09007-A
Preliminary
Design-in
Page 35 of 62
Short Circuit Detection (SCD)
A short circuit in the active antenna pulls
V_ANT
to ground. This is detected inside the u-blox 6 module and the
antenna supply voltage will be immediately shut down.
Antenna short detection (SCD) and control is enabled by default.
Open Circuit Detection (OCD)
R1
R2
R3
−
+
u-blox 6 Module
GND
RF_IN
GND
V_ANT
VCC_RF
AADET_N
u1
Figure 30: Schematic of open circuit detection variant A (for exact pin orientation see data sheet)
References
Value
Tolerance
Description
Remarks
R1
10
Ω
±
5%
Resistor, min 0.063 W
R2
560
Ω
±
5%
Resistor
R3
100 k
Ω
±
5%
Resistor
u1
LT6000
Rail to Rail Op Amp
Table 7: Active antenna supervisor, bill of material
RF
Vcc
R
R
R
R
I
_
1
3
2
2
•
+
=
Equation 1: Calculation of threshold current for open circuit detection
If the antenna supply voltage is not derived from Vcc_RF, do not exceed the maximum voltage rating of
AADET_N.
The open circuit detection circuit uses the current flow to detect an open circuit in the antenna. The threshold
current can be calculated using Equation 1.
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