Jackson Labs LTE-Lite, User Manual

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© 2020 Jackson Labs Technologies, Inc. 13
LTE-Lite User Manual
2.3 LTE-Lite SMT Module usage
The LTE-Lite SMT Module by itself is designed to be soldered into a customer PCB using standard
SMT pick-and-place procedures. The SMT module is designed as a 0.032 inches thin single-sided
PCB with 32 castellated solder pads on the bottom and on the sides of the module. It is recommended
that the users’ PCB has a filled ground plane under the SMT module, and does not contain any traces
under the SMT module to avoid cross-talk into signals inside the module. It is also recommended that
the users’ PCB has a solid silkscreen layer under the SMT module to generate insulation between the
SMT module and the users’ PCB. Soldering can be done manually, or using standard reflow oven
soldering procedures. The module can be soldered onto the customers’ PCB using lead or RoHs
procedures.
The LTE-Lite SMT module is moisture sensitive, and it must be pre-baked before
reflow-soldering to avoid damage to the internal IC’s from moisture absorbtion. Pre-bakeing
should be done at +110 Degrees C maximum for 24 hours prior to soldering the module to a
customers’ PCB. Pre-bakeing is not required for manually hand-soldering the unit onto a
customers’ PCB using a solder-iron (not a heat-gun).
2.3.1 LTE-Lite SMT Module Minimum Required Setup
The following schematics show the minimum required connections to operate the LTE-Lite SMT
Module. Only a +3.3V power supply is needed, an antenna connection to the internal U.Fl coax
connector, and a connection to the TCXO output and 1PPS output are needed to use the module.
JP1 Debug
Connector Debug status,
Synthesizer
Frequency
selector, 1Hz/5Hz
NMEA selector,
Raw 1PPS output,
RESET# output
signal Pins 9, 10, and 11: Insert
jumpers
Pins 12 and 13: CMOS 3.3V
output of GPS 1PPS and GPS
TXD
Pin 14: Insert jumper for 5Hz
NMEA output
Pin 15: Indicates when
synthesizer is phase-locked (can
be used as a RESET# signal to
other circuits)
Pin 16: +3.3V, 50mA max Insert jumpers between Pins 9
and 8, 10 and 7, 11 and 6 to
select synthesized output
frequency.
Insert jumper between pin 14
and 3.
Pin 15: standard 3.3V CMOS
level RESET# output signal with
up to 1s reset active low