Ublox MAX-M10S, Integration Manual

Page: 82 / 89

MAX-M10S - Integration manual
• V_BCKP supply is optional. If present, the hardware backup mode is supported. This mode
maintains the time and GNSS orbit data in the battery-backed RAM memory if the main supply
is switched off.
If there is no backup supply, the EXTINT pin can be used for time aiding and the GNSS orbit data
can be aided using AssistNow services or downloaded to the host and fed back to the receiver
at startup.
• A passive or active antenna can be used. An active antenna can be supplied either with the
VCC_RF output from MAX-M10S, as shown in Figure 38 , or from an external supply, as shown in
Figure 39 . Nevertheless, the internal LNA provides enough gain for passive antennas.
• MAX-M10S has an internal SAW filter and no additional RF front-end components are needed.
However, in cellular applications, an external SAW filter can be added in front of RF_IN as shown
in
Figure 38 , which allows an SAW-LNA-SAW RF front-end circuit for improved out-of-band
immunity against RF interference from other sources.
• UART and I2C communication interfaces are available.
• For an absolute minimum design using UART, other PIOs (RESET_N, EXTINT, TIMEPULSE, SDA,
SCL, SAFEBOOT_N) can be left open.
Figure 36: Typical 3.3 V design
UBX-20053088 - R03 Appendix Page 82 of 89
C1-Public