Rf Connection - u-blox LISA-C2 Series System Integration Manual

Power-on
•
Ensure V_INT is 0V before power-on (ie no back feed voltage)
•
Ensure VCC is 0V before applying supply for 'VCC method' as described in section 1.6.4.2
Power-off
•
Use AT+CPWROFF AT command to gracefully power down
•
Minimize or avoid entirely using under voltage method to shutdown C200.
•
If under voltage method is the only option, then wait until the module has been powered on for a
minimal 10 sec before doing so
Reset
•
Use AT+CFUN=1 AT command method to perform reset
•
After power-on, it is not necessary and not recommended to perform a reset to ensure modem is
starting from a "fresh" state
•
Minimize or avoid entirely using RESET_N pin to perform reset
•
Asserting RESET_N pin low to perform a reset, should only be 300 to 500 ms
•
Do not hold RESET_N over 500 ms, because as the time gets near 1000 ms it will cause the module to
abruptly power-off.
•
RESET_N should only be used as a last option. If it should be utilized then:
1. Allow the module to be powered on for a minimal of 10 sec before apply this reset method
2. Do allow enough time between each reset attempt with the RESET_N pin method
Control pins
•
Driving/pulling RESET_N high externally is NOT permitted
•
Driving/pulling PWR_ON high externally is NOT permitted

1.7 RF connection

The ANT connector has a 50 Ω nominal characteristic impedance and must be connected to the antenna
through a 50 Ω transmission line to allow transmission and reception of radio frequency (RF) signals in the Cell
and PCS operating bands.
Name Description
ANT RF connector
FW75-C200 Ant
LISA-C200 Ant
Table 11: Antenna connector
The ANT port ESD sensitivity rating is 2KV (according to JESD22-A114D / AEC-Q100-002 for Human Body
Model). Higher protection level could be required if the line is externally accessible on the application board.
Choose an antenna with optimal radiating characteristics for the best electrical performance and overall module
functionality. Focus on minimizing the insertion loss between radiating antenna and the module RF connector.
Overall system performance depends on antenna reception and transmission. See section 2.4 for further details
regarding antenna guidelines.
UBX-13000620 - R21
LISA-C2 series and FW75-C200 - System Integration Manual
Remarks
Zo = 50 Ω nominal characteristic impedance.
U.FL connector
Surface Mount pad
Early Production Information System description
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