MAX-M10M-Integration manual
If CFG-HW-ANT_CFG_PWRDOWN has been enabled previously (set to true), the polarity of
the ANT_OFF_N signal will change to power down (disable) the antenna supply when a short
is detected.
After a detected antenna short, the reported antenna status will continue to be reported
as a SHORT. If auto-recovery is enabled for the antenna short detection, the antenna status
can recover after a timeout of 60 seconds. Recovering the antenna status immediately
requires either a power cycle or switching the antenna short detection off and on again.
2.4.1.5 Antenna short detection auto-recovery
Enable the antenna short detection auto-recovery by setting the configuration item CFG-HW-
ANT_CFG_RECOVER to true (1).
To use the auto-recovery feature, enable CFG-HW-ANT_CFG_PWRDOWN which requires
CFG-HW-ANT_CFG_SHORTDET and CFG-HW-ANT_CFG_VOLTCTRL to be enabled.
Result:
• UBX-MON-RF: Antenna status = OK. Antenna power status = ON.
• ANT_OFF_N = active low. The pin is pulled high to enable an external antenna.
• ANT_SHORT_N = active low. The pin is default high (PIO pull-up enabled, to be pulled low if a
SHORT is detected).
Startup message at power-up if the configuration is stored:
$GNTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*3E
$GNTXT,01,01,02,ANTSTATUS=INIT*3B
$GNTXT,01,01,02,ANTSTATUS=OK*25
ANTSUPERV=AC SD PDoS SR (indicates short circuit recovery added - SR)
If short circuit is detected (ANT_SHORT_N pulled low):
$GNTXT,01,01,02,ANTSTATUS=SHORT*73
• UBX-MON-RF: Antenna status = SHORT. Antenna power status = OFF (automatic power-down
is enabled).
• ANT_OFF_N = low (external antenna disabled).
After a timeout period of 60 seconds, the receiver will retest the short circuit condition by enabling
the antenna (i.e. pulling ANT_OFF_N high).
If a short is not present, the receiver will report antenna condition is OK:
$GNTXT,01,01,02,ANTSTATUS=OK*25
UBX-MON-RF: Antenna status = OK. Antenna power status = ON.
2.4.1.6 Antenna open circuit detection - ANT_DETECT
Enable the antenna open circuit detection by setting the configuration item CFG-HW-
ANT_CFG_OPENDET to true (1).
Result:
• UBX-MON-RF: Antenna status = OK. Antenna power status = ON.
• ANT_OFF_N = active low. The pin is pulled high to enable an external antenna.
• ANT_SHORT_N = active low. The pin is default high (PIO pull-up enabled, to be pulled low if a
SHORT is detected).
UBX-22038241 - R01
2 Receiver functionality Page 30 of 90
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