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Cinterion
®
LGA DevKit User Guide
10.3 Errata/Troubleshooting
27
lga_devkit_ug_v02
2019-05-27
Preliminary
Page 26 of 28
10.3
Errata/Troubleshooting
PCB B22 Antenna Matching
The LGA DevKit's PCB revision B22 - built in a smaller quantity - has a decreased RF matching
that will be fixed in an upcoming version. The below figure shows the S11 DevKit's MAIN an-
tenna (left) and the S21 DevKit's MAIN antenna RF path loss (right) of the PCB's B22 revision.
Radio/Temperature Measurement
The LGA DevKit comes with minor limitations in terms of radio frequency and temperature eval-
uation because of a slightly increased RF path loss and module temperature encapsulation in-
side the LGA socket.
PCB22/23 with DSB-Mini as Expander Board - ON LED
When the DSB-Mini is used as port expander there is a current back feeding that results in an
constant glowing ON LED on the LGA DevKit.
There is no impact in functionality. To fix this, place a 4k7 resistor from the ASC0 switch (upper
pad) to V480 close to the patch field.