MAX-M10M-Integration manual
Part Description
R8 Current limiter in the event of a short circuit
Table 17: Components in two-pin antenna supervisor
The open drain buffer shown in Figure 11 is not needed if V_ANT is the same voltage level as V_IO.
3.3.1.3 Antenna voltage control - ANT_OFF_N
The antenna voltage control is enabled by default in MAX-M10M with the configuration item CFG-
HW-ANT_CFG_VOLTCTRL set to true (1).
The antenna status (as reported in UBX-MON-RF and UBX-INF-NOTICE messages) is not
reported unless the antenna voltage control has been 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 or LNA.
Startup message at power-up if the configuration is stored:
$GNTXT,01,01,02,ANTSUPERV=AC *00
$GNTXT,01,01,02,ANTSTATUS=INIT*3B
$GNTXT,01,01,02,ANTSTATUS=OK*25
ANTSUPERV=AC indicates that antenna control is activated.
3.3.1.4 Antenna short detection - ANT_SHORT_N
Enable the antenna short detection by setting the configuration item CFG-HW-
ANT_CFG_SHORTDET to true (1).
Result:
• UBX-MON-RF: Antenna status = OK. Antenna power status = ON.
• ANT_OFF_N = active low to disable an external antenna. Therefore, the pin is pulled high to
enable an external antenna.
• ANT_SHORT_N = active low to report a short circuit. The pin is default high (PIO pull-up
enabled).
Startup message at power-up if the configuration is stored:
$GNTXT,01,01,02,ANTSUPERV=AC SD *37
$GNTXT,01,01,02,ANTSTATUS=INIT*3B
$GNTXT,01,01,02,ANTSTATUS=OK*25
ANTSUPERV=AC SD indicates that antenna control and short detection are activated.
If a short circuit is detected in the antenna (ANT_SHORT_N pulled low):
$GNTXT,01,01,02,ANTSTATUS=SHORT*73
• UBX-MON-RF: Antenna status = SHORT. Antenna power status = ON (automatic power-down
is not enabled, CFG-HW-ANT_CFG_PWRDOWN is off by default).
• ANT_OFF_N = high (external antenna enabled).
UBX-22038241 - R02
3 Receiver functionality Page 31 of 92
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