u-blox LEA-M8S, Руководство по интеграции оборудования

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LEA-M8S / LEA-M8T - Hardware Integration Manual
UBX-13003140 - R07 Production Information Design
Page 13 of 31
Active antenna design powered from external supply
Figure 10 shows a design with direct externally powered active antenna.
This circuit has to be used if the active antenna has a different supply voltage than the VCC_RF (for example if a
5 V active antenna is used).
Figure 10: Active antenna design, direct external supply (for exact pin orientation see the LEA-M8S Data Sheet [1] and the
NEO/LEA-M8T Data Sheet [2])
For recommended parts, see Appendix .
In case
VCC_RF
voltage does not match with the antenna supply voltage, use a filtered external supply
as shown in Figure 10.
Antenna design with active antenna using antenna supervisor
An active antenna supervisor provides the means to check the antenna for open and short circuits and to shut
off the antenna supply if a short circuit is detected. The Antenna Supervisor is configured using serial port UBX
binary protocol message. Once enabled, the active antenna supervisor produces status messages, reporting in
NMEA and/or UBX binary protocol. These indicate the particular state of the antenna supervisor shown in the
state diagram (see Figure 11
)
.