Jackson Labs LTE-Lite, User Manual

Page: 26 / 34

LTE-Lite User Manual
22 © 2020 Jackson Labs Technologies, Inc.
10 +3.0V Out +3.0V output of
internal Low
Noise Linear
regulator +3.0V +/-0.1V, can supply up to
50mA This pin connects to the internal
Low Noise Low Dropout 3.0V
Linear Regulator. Can be used to
attach optional external
bypassing caps for lower noise,
or to power external 3.0V
TCXOs or buffers
11 NMEA_1Hz/
5Hz Selects NMEA
output Rate
1Hz/5Hz Pull to ground to initiate 5Hz
GPS NMEA output rate
Leave floating for 1Hz rate Pulling this pin low initiates 5Hz
NMEA GPS fix outputs. Leave
floating for default 1Hz output
rate
12 RXD_CPU RXD serial port
input of internal
microprocessor 3.3V CMOS input This pin is internally connected
to the GPS receiver TXD output
via a 2.7K Ohms resistor. Leave
unconnected, used for factory
purposes
13 TXD_GPS TXD serial output
from GPS
receiver 3.3V CMOS TXD serial output from GPS
receiver. Contains various
NMEA messages in 38.4K
Baud, 8N1 format. Do Not
connect directly to RS-232
levels
14 TXD_CPU TXD serial output
from internal
microprocessor 3.3V CMOS Serial data output from internal
microprocessor. Contains the
JLT proprietary status and health
NMEA-like sentence
15 PPS_GPS_
RAW GPS receiver
1PPS output 3.3V CMOS, synchronized to
UTC(GPS). Contains sawtooth
error Raw GPS 1PPS output signal
generated directly by GPS
receiver. Not sawtooth corrected
16 MOBILE# Initiates Mobile
(3D) GPS mode Pull to ground to initiate Mobile
GPS mode and disable Auto
Survey Position Hold mode.
WARNING: DO NOT CHANGE THE
SETTING OF THIS PIN WITH
POWER APPLIED TO THE UNIT,
THIS MAY CORRUPT THE FLASH
OF THE GPS RECEIVER
PERMANENTLY.
Pulling this pin low causes the
internal GPS receiver to boot up
the mobile GPS mode (3D
mode), disabling the Position
Hold Auto Survey feature. Leave
floating for Timing GPS receiver
mode.
WARNING: DO NOT CHANGE THE
SETTING OF THIS PIN WITH
POWER APPLIED TO THE UNIT,
THIS MAY CORRUPT THE FLASH
OF THE GPS RECEIVER
PERMANENTLY.
17 GND3 Ground Ground Ground. Connect all module
grounds together