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© 2020 Jackson Labs Technologies, Inc.

17

LTE-Lite User Manual

2.3.4 Adding a USB output to the LTE-Lite SMT Module for NTP

applications

The following schematics show an example of how to connect a USB serial adaptor chip to the
LTE-Lite SMT Module to supply NMEA PVT/status information and a 1PPS pulse to NTP
applications.

Figure 2.12 Adding a USB output to the LTE-Lite SMT Module

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Содержание LTE-Lite

Страница 1: ...LTE Lite tm User Manual Document 80200522 Version 1 4 Date 25 June 2020...

Страница 2: ...LTE Lite User Manual Copyright 2013 to 2020 Jackson Labs Technologies Inc...

Страница 3: ...SMT Module usage 13 2 3 1 LTE Lite SMT Module Minimum Required Setup 13 2 3 2 Using the LTE Lite SMT Module with external TCXOs 14 2 3 3 Using the LTE Lite SMT Module Synthesized Frequency Output 16...

Страница 4: ...LTE Lite User Manual ii 2020 Jackson Labs Technologies Inc...

Страница 5: ...rface precision voltage references power filters and DACs It generates a low noise 10 19 2 20MHz signal with typically better than 1E 09 precision and accuracy 1ppb better than typ 135fs jitter 100Hz...

Страница 6: ...ch as power supply ground This should be done before handling the circuit board or anything connected to it i e the GPS antenna 1 2 2 Antenna Lightning Protection Always use a UL certified properly in...

Страница 7: ...e is possible 4 sats are required for Mobile mode non Position Hold operation The Evaluation Board is powered directly from the USB cable and or from an optional external 5V DC source on the 5V header...

Страница 8: ...nna cable can be extended to 100m or more with high quality antenna cable use quad shielded RG 6 75 Ohms cable or high quality 50 Ohms coax cable without significant loss of signal quality WARNING Mak...

Страница 9: ...directly connected to a PC s USB port from which it will receive power and to which it will send serial output sentences with no external RS 232 to USB adaptor is required The term RS 232 and USB ser...

Страница 10: ...ase Noise and ADEV Plots The following plot shows a typical ADEV plot for the LTE Lite Evaluation Board The unit had been operating for 5 days has not been moved or vibrated in any way and was complet...

Страница 11: ...ypical Phase Noise plot of the TCXO buffered RF output for the LTE Lite Evaluation Board The unit had been operating for 1 day and was completely shielded from airflow by placing the unit into an airt...

Страница 12: ...LTE Lite User Manual 8 2020 Jackson Labs Technologies Inc 2 1 6 Evaluation Board Mechanical Dimensions Figure 2 6 Mechanical dimensions...

Страница 13: ...igure 2 7 Mechanical dimensions of the LTE Lite SMT Module 2 1 8 LTE Lite Evaluation Board Schematics The following schematics may be used as an example of how to connect the LTE Lite SMT Module and t...

Страница 14: ...LTE Lite User Manual 10 2020 Jackson Labs Technologies Inc Figure 2 8 Schematics of LTE Lite Evaluation Board...

Страница 15: ...ned off WARNING DO NOT CHANGE THE SETTING OF THIS JUMPER WITH POWER APPLIED TO THE UNIT THIS MAY CORRUPT THE FLASH OF THE GPS RECEIVER PERMANENTLY J2 20MHz 10MHz or 19 2MHz CMOS Out Buffered RF output...

Страница 16: ...to indicate Auto Survey is in process Lights up during Auto Survey LED D6 LOCK OK Indicates No Events are pending and oscillator is locked Lights up when oscillator is locked to UTC via GPS receiver...

Страница 17: ...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 ha...

Страница 18: ...2 Using the LTE Lite SMT Module with external TCXOs The following schematics shows how to connect an external 3 0V TCXO to the LTE Lite SMT Module using the internal low noise 3 0V regulator output to...

Страница 19: ...to allow the internal TCXO to operate by default Allowable external frequencies are 10MHz 15 36MHz 19 2MHz and 20MHz Additional frequencies may be supported by the firmware at a later date External os...

Страница 20: ...3 3 Using the LTE Lite SMT Module Synthesized Frequency Output The following schematics show an example of how to use the un buffered synthesized RF output of the LTE Lite SMT Module Figure 2 11 Using...

Страница 21: ...he LTE Lite SMT Module for NTP applications The following schematics show an example of how to connect a USB serial adaptor chip to the LTE Lite SMT Module to supply NMEA PVT status information and a...

Страница 22: ...r pin 20 can support up to 100mA current and antenna voltage ranges of 3 0V to 5V The unit supports external passive antennae 0dB gain or active antennae with up to 30dB antenna amplification at GPS L...

Страница 23: ...ows the available output frequency selections based on the TCXO frequency and the required resistor straps for the desired synthesized frequency Leaving an FS strap pin unconnected results in a 1 high...

Страница 24: ...l port output pin with a 2 7K Ohms series resistor and to the USB serial port transmit pin via switch SW3 on the evaluation board This allows the GPS receiver to send NMEA serial information to the mi...

Страница 25: ...RF Output from TCXO default or RF input External TCXO option 3 3V CMOS can supply up to 24mA buffered TCXO output by default 3 3V CMOS or TTL input when internal TCXO is disabled by pulling pin 8 high...

Страница 26: ...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 Cont...

Страница 27: ...RF Synthesizer output and In System Programming ISP mode initialization Do not pull low at any time 3 3V CMOS output Can drive up to 10mA ISP mode for factory use only This pin generates the synthesi...

Страница 28: ...a number of standard navigation messages that are compatible with most GPS based navigation software and are sent to the USB port Alternatively a toggle switch can be used to select a NMEA style prop...

Страница 29: ...software for 38400 Baud 8 bits no parity 1 stop bit and no flow control where applicable 2 5 1 Proprietary PSTI NMEA GPS Status Sentence When in timing mode the GPS receiver NMEA serial status output...

Страница 30: ...esent on this serial port 2 5 2 1 Lock Status Definition Lock Status definitions The third binary bit in the status parameter is encoded in the same status as the LOCK OK LED 2 5 2 2 Health Status Def...

Страница 31: ...ologies Inc 27 LTE Lite User Manual If the TCXO voltage is too high HEALTH STATUS 0x40 If the TCXO voltage is too low HEALTH STATUS 0x80 For the first 2 minutes after a phase reset or a coarse DAC cha...

Страница 32: ...LTE Lite User Manual 28 2020 Jackson Labs Technologies Inc...

Страница 33: ...mer shall prepay shipping charges and shall pay all duties and taxes for products returned to Jackson Labs Technologies Inc for warranty service Except for products returned to Customer from another c...

Страница 34: ...son Labs Technologies Inc products are not intended for use in medical life saving or life sustaining applications 3 1 3 Exclusive Remedies THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXC...

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