LEA-6 / NEO-6 / MAX-6 - Hardware Integration Manual
UBX-14054794 Production Information Design-in
Page 45 of 85
Table 17: Short circuit protection, bill of material
Short circuits on the antenna input without limitation (R_BIAS) of the current can result in
permanent damage to the receiver! Therefore, it’s recommended to implement an R_BIAS in all
risk applications, such as situations where the antenna can be disconnected by the end-user or
that have long antenna cables.
An additional R_BIAS is not required when using a short and open active antenna supervisor circuitry as
defined in Section 2.6.4.1, as the R_BIAS is equal to R2.
2.6.4 Active antenna supervisor (LEA-6)
u-blox 6 Technology provides the means to implement an active antenna supervisor with a minimal number of
parts. The antenna supervisor is highly configurable to suit various different applications.
u-blox 6 Module
GND
RF_IN
GND
Active Antenna
V_ANT
VCC_RF
LNA
AADET_N
Antenna
Supervisor
Circuitry
external
antenna
voltage
supply
Figure 44: External antenna power supply with full antenna supervisor (for exact pin orientation see data sheet)
2.6.4.1 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. Active antenna status
can be determined also polling UBX-MON-HW.
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 45 applies. If an antenna is
connected, the initial state after power-up is “Active Antenna OK”.
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