MAX-M10S - Integration manual
The internal LNA mode can also be permanently configured in the receiver's one-time programmable
(OTP) memory. Changes to the bits in the OTP memory cannot be modified after they are
programmed. The OTP configuration is only done once in production, and is subsequently applied
automatically at every startup. The internal LNA mode can be reconfigured in BBR and RAM layers
with the configuration item CFG-HW-RF_LNA_MODE and applying a software reset.
The default low-gain mode is pre-configured in the receiver and does not require configuration in
production. The configuration string for setting the internal LNA in bypass mode in the OTP memory
is given in
Once the internal LNA mode is configured to bypass mode, it cannot be reverted to low-gain
mode in the OTP memory.
Internal LNA mode
Configuration string
Low gain
Default
Bypass
B5 62 06 41 10 00 03 00 05 1F 79 B2 0A E5 28 EF 12 05 9F FF FF FF 62 FB
Table 2: Internal LNA mode configuration in OTP memory
To configure the internal LNA in bypass mode in OTP memory:
1.
Power up the system.
2.
Test the communication interface by polling the UBX-MON-VER message.
3.
Send the configuration string in
.
4.
Power the receiver off and on or send UBX-CFG-RST message (the reset type must be set to a
hardware reset). The new internal LNA setting is applied at startup.
5.
Verify that the configuration item is correctly set by polling CFG-HW-RF_LNA_MODE at RAM
layer using the UBX-CFG-VALGET message.
6.
The OTP memory configuration is completed.
2.1.1.3 GNSS signal configuration
MAX-M10S supports concurrent reception of four major GNSS constellations using the GPS L1C/A,
Galileo E1, BeiDou B1C, and GLONASS L1OF signals. BeiDou B1I signal is also supported, but cannot
be used simultaneously with BeiDou B1C or GLONASS L1OF signals. The default configuration is
concurrent reception of GPS, Galileo and BeiDou B1I with QZSS and SBAS enabled.
BeiDou B1I signal cannot be used simultaneously with BeiDou B1C or GLONASS L1OF
signals.
GNSS constellations and signals can be configured using the CFG-SIGNAL-* configuration group.
Each GNSS constellation can be enabled or disabled independently except for QZSS and SBAS,
which are functional only with GPS. In addition to the configuration key for each constellation, there
is a configuration key for each signal supported by the firmware. Unsupported combinations will be
rejected with a UBX-ACK-NAK message, and the warning "invalid sig cfg" will be sent via UBX-INF
and NMEA-TXT messages (if enabled).
For example, if CFG-SIGNAL-GPS_ENA is set to zero, all signals from the GPS constellation are
disabled. Alternatively, if CFG-SIGNAL-GPS_L1CA_ENA is set to zero, only the GPS L1 C/A signal is
disabled.
It is recommended to enable QZSS L1C/A when GPS L1C/A is enabled in order to mitigate
possible cross-correlation issues between the signals.
Refer to the interface description [
] for more information on the CFG-SIGNAL-* configuration group.
UBX-20053088 - R03
2 Receiver functionality
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