ST Teseo-LIV3F User Manual
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ST Teseo-LIV3F User Manual

Gnss module
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Introduction
Teseo-LIV3 is a family of tiny GNSS modules sized 9.7 mm × 10.1 mm × 2.5 mm featuring
STMicroelectronics
which embeds the new ST GNSS positioning engine capable of receiving signals from
multiple satellite navigation systems.
This document is relevant for the following Teseo-LIV3 modules.
Teseo-LIV3F
Teseo-LIV3R
In
Figure 1
February 2019
Teseo-LIV3 GNSS Modules - Hardware Manual
®
positioning receiver Teseo III. It is a standalone positioning receiver
Table 1. Teseo-LIV3 supported devices
Device type
pinout of the module is represented as follows:

Figure 1. Teseo-LIV3 pinout

UM2231 Rev 6
User manual
Description
Tiny GNSS module flash based
Tiny GNSS module ROM based
UM2231
1/26
www.st.com
1

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Summary of Contents for ST Teseo-LIV3F

  • Page 1: Figure 1. Teseo-Liv3 Pinout

    ® STMicroelectronics positioning receiver Teseo III. It is a standalone positioning receiver which embeds the new ST GNSS positioning engine capable of receiving signals from multiple satellite navigation systems. This document is relevant for the following Teseo-LIV3 modules. Table 1. Teseo-LIV3 supported devices...

  • Page 2: Table Of Contents

    Contents UM2231 Contents Power ........... . . 6 VCC (pin8) .
  • Page 3 UM2231 Contents Layout recommendation ........19 Antenna recommendations .
  • Page 4 List of tables UM2231 List of tables Table 1. Teseo-LIV3 supported devices ..........1 Table 2.
  • Page 5 UM2231 List of figures List of figures Figure 1. Teseo-LIV3 pinout ............1 Figure 2.

  • Page 6: Power

    Power UM2231 Power Teseo-LIV3 is supplied by 3 power pins: VCC (pin8), VCC_IO (pin7) and VBAT (pin6). VCC (pin8) VCC is the main supply. V limiting values are: 2.1 V - 4.3 V. At startup or during low power application current can change suddenly. It is important that supply IC is able to provide this current variation.

  • Page 7: Vcc_Io (Pin7)

    UM2231 Power fix VBAT prevents current flow as soon as VBAT is lower than VCC. It is important when VBAT is supplied with small battery and especially if battery is not rechargeable. VBAT range can be from 2.1 V to 4.3 V. VCC_IO (pin7) VCC_IO is 3.3 V.

  • Page 8: Power Supply Design Reference

    Power UM2231 Figure 4. Output supply filtering Power supply design reference During prototyping stage, for the first PCBs, it is recommended to plan to have some filtering components on Teseo-LIV3 power supplies as shown In Figure Figure 5. Power supply filtering Inductor size is 0401 (1.0×0.5mm) and capacitors are 0201 (0.6×0.3mm).

  • Page 9: Figure 6. Example Of Smps To Improve Current Consumption

    UM2231 Power Figure 6. Example of SMPS to improve current consumption If VCC_IO is also supplied by an SMPS, this will reach the lowest current consumption. UM2231 Rev 6 9/26...

  • Page 10: Reserved (Pin15, 18)

    Reserved (pin15, 18) UM2231 Reserved (pin15, 18) In Teseo-LIV3 pin15 and 18 are reserved. 10/26 UM2231 Rev 6...

  • Page 11: Interfaces

    UM2231 Interfaces Interfaces I2C (pin16, 17) Teseo-LIV3 supports I2C slave mode only. Internal 10 K pull-up resistor on VCC_IO is present. It is important to avoid having other pull-up for current leakage in low power mode. UART (pin2, 3) UART is a Universal Asynchronous Receiver/Transmitter that supports much of the functionality of the industry-standard 16C650 UART.

  • Page 12: I/O Pins

    SYS_RESETn (pin9) It can force a Teseo-LIV3 under reset. Reset signal is active low. Host processor must have full control of this pin to guarantee the Teseo-LIV3F’s firmware upgrade support. It is mandatory only on Teseo-LIV3F. RF_IN (pin10) It is the RF input.

  • Page 13: Standby Modes

    UM2231 Standby modes Standby modes Standby mode is the mode where only low power backup domain is running. It means VBAT must always be maintained. It allows to have very low current consumption and fast GNSS re-acquisition at the end of the standby time due to RTC. Teseo-LIV3 offers 2 different ways of standby: ...

  • Page 14: Front Ends Management

    Front ends management UM2231 Front ends management RF input impedance is 50 Ω. External LNA External LNA means a passive antenna used with an LNA on the same PCB as Teseo-LIV3 module. To optimize power consumption during low power mode if needed, the LNA should have an enable pin compatible with VCC_IO to be switched OFF/ON.

  • Page 15: Active Antenna

    UM2231 Front ends management Active antenna To optimize the current during low power operating mode, the active antenna can be used with a switch to cut the current flow. Figure 10. Active antenna current switch control To improve the functionality, a current limiter could be used in order to prevent any short circuit on the antenna see Figure Figure 11.

  • Page 16: Reference Schematic And Bom

    Reference schematic and BOM UM2231 Reference schematic and BOM Schematic Figure 12. General schematic 16/26 UM2231 Rev 6...

  • Page 17: Bill Of Material

    UM2231 Reference schematic and BOM 7.1.1 Bill of material Table 2. Bill of material Manufacturing 1 Manufacturing 2 Refs Value Description Name Part number Name Part number Surface mount 0603 capacitor 4 µ7 ceramic 4.7 µF, 10% 10 V X7S Murata GRM188C71A475KE11 4 µ7;...

  • Page 18: Table 2. Bill Of Material

    Reference schematic and BOM UM2231 Table 2. Bill of material (continued) Manufacturing 1 Manufacturing 2 Refs Value Description Name Part number Name Part number Low Noise Amplifier for GPS, BGA72 GLONASS, Galileo and Infineon BGA725L6 Compass BGA725L6 Automotive SAW RF filter for B4327 Epcos B39162B4327P810...

  • Page 19: Layout Recommendation

    Place ground vias below Teseo-LIV3 all around and in the middle and also around the 3 ground pins. The following layout presents layout recommendation to ensure the best performances of Teseo-LIV3. ST heartily recommends having a maximum of ground vias below the module as illustrated in the Figure...

  • Page 20: Figure 15. Layout Proposal

    Layout recommendation UM2231 Figure 15. Layout proposal As GNSS signals are very low, it is important to take care of the layout. There are 2 main recommendations to follow for Teseo-LIV3 layout. Many ground vias have to be placed around the RF ground (Pin10 and 12) to increase ground size.

  • Page 21: Antenna Recommendations

    UM2231 Antenna recommendations Antenna recommendations Patch antennas Patch antennas have different sizes from 25×25mm, 18×18mm and 12×12mm. They have the advantage to be cheap, with good efficiency and highly directive. They can be used when mounted on horizontal support. For performances, the bigger are the antennas and the better are the performances. 9.1.1 Antenna on the opposite side This implementation allows to obtain the best GNSS performances.

  • Page 22: Antenna On The Same Side Than Teseo-Liv3

    Antenna recommendations UM2231 Figure 18. Antenna on bottom layer and Teseo-LIV3 on top layout example On the antenna side, there's only a ground pad as large as the antenna with one big via for antenna pin. If the ground plane can be larger than the antenna side it will improve the antenna performance.

  • Page 23: Chip Antenna

    UM2231 Antenna recommendations Table 4. List of SMD antennas Manufacter Part number Constellation Size Taoglas SGGP.25.4.A.02 GPS+Glonass+Galileo 25×25mm Taoglas SGGP.18.4.A.02 GPS+Glonass+Galileo 18×18mm Yageo ANT1818B00BT1516S GPS+Glonass 18×18mm Yageo ANT2525B00BT1516S GPS+Glonass 25×25mm It is important to follow the example of layout with Teseo-LIV3 placed at 2 cm of the antenna, as shown in Figure Figure 19.

  • Page 24: Remote Antenna

    Antenna recommendations UM2231 Figure 20. Chip Antenna and Teseo-LIV3 on same layer example It is necessary to follow the layout Teseo-LIV3 recommendations in Chapter Remote antenna Remote antenna means antenna connected to PCB where Teseo-LIV3 is soldered with an RF connector. The best performance can be obtained if the remote antenna is placed more than 2cm far from Teseo-LIV3.

  • Page 25: Revision History

    Section 9: Antenna recommendations. Minor text changes. Updated Figure Figure Figure Figure Figure Figure 19 Figure 29-Nov-2018 Added Figure Updated Table 2 Table Updated Introduction. 20-Feb-2019 Replaced “Teseo-LIV3F” with “Teseo-LIV3”. Added Table 1: Teseo-LIV3 supported devices. UM2231 Rev 6 25/26...
  • Page 26 ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.

This manual is also suitable for:

Teseo-liv3 seriesTeseo-liv4ftrTeseo-liv3r

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