ST Teseo-LIV4FM User Manual
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ST Teseo-LIV4FM User Manual

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UM3004
User manual
Teseo-LIV4F and Teseo-LIV4FM hardware documentation
Introduction
The Teseo-LIV4F and Teseo-LIV4FM modules are an easy-to-use Global Navigation Satellite System (GNSS) standalone low
power module, embedding Teseo IV single die GNSS receiver IC working simultaneously on multiple constellations (GPS/
Galileo/Glonass/BeiDou/QZSS) able to provide positioning (Teseo-LIV4F) or raw measurement data (Teseo-LIV4FM).
UM3004 - Rev 3 - November 2023
www.st.com
For further information contact your local STMicroelectronics sales office.

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Summary of Contents for ST Teseo-LIV4FM

  • Page 1 Teseo-LIV4F and Teseo-LIV4FM hardware documentation Introduction The Teseo-LIV4F and Teseo-LIV4FM modules are an easy-to-use Global Navigation Satellite System (GNSS) standalone low power module, embedding Teseo IV single die GNSS receiver IC working simultaneously on multiple constellations (GPS/ Galileo/Glonass/BeiDou/QZSS) able to provide positioning (Teseo-LIV4F) or raw measurement data (Teseo-LIV4FM).

  • Page 2: Pin Out

    UM3004 Pin out Pin out In the following figure, the pin out of the module: Figure 1. Pin out RF ground Reset GND RF RESETn Antenna connexion (50 Ω) Main supply RF IN RF ground GND RF Reserved Backup supply Reserved VBATT Antenna supply...

  • Page 3: Power

    UM3004 Power Power Teseo-LIV4F/FM is supplied by two power pins: • VCC (pin 8) VCC is the main supply: its range can be from 1.8 V to 3.3 V. At startup or during low power application, current can change suddenly. It is important to use power device able to provide this current variation.

  • Page 4: Current Consumption Optimization

    UM3004 Power Current consumption optimization To optimize battery current consumption, it is possible to use a SMPS at 1.8 V to supply VCC. Here is an application example with ST1S15J18R with an efficiency around 85%. Figure 3. Example of SMPS to improve current consumption MODE 2.3V –...

  • Page 5: Reserved (Pin 7, Pin 13 And Pin 15)

    UM3004 Reserved (pin 7, pin 13 and pin 15) Reserved (pin 7, pin 13 and pin 15) In Teseo-LIV4F/FM, the pin 7, pin 13 and pin 15 are reserved. Let the pin floating. UM3004 - Rev 3 page 5/17...

  • Page 6: Interfaces

    UM3004 Interfaces Interfaces C (pin 16, pin 17) C is in slave only. Internal 4.7 kΩ pull-up resistor on VCC is present. It is important to avoid having other pull-up for current leakage in low power mode. UART (pin 2, pin 3) UART is Universal Asynchronous Receiver/Transmitter that supports much of the functionality of the industry- standard 16C650 UART.

  • Page 7: O Pins

    UM3004 I/O pins I/O pins PPS (pin 4) PPS is the time pulse every one second. It can be configured with different condition of pulses. For firsts PCB, it is recommended to plan to have some filtering components on Teseo-LIV4F/FM PPS (pin 4). EXTINT (pin 5) It is a GPIO which, by default, is a trigger pin to external interrupt.

  • Page 8: Standby Mode

    UM3004 Standby mode Standby mode Standby mode is the mode where only low power backup domain is running and VCC is OFF. It means VBAT must be always maintained. It allows to have very low current consumption and fast GNSS reacquisition at the end of the standby time due to RTC.

  • Page 9: Front Ends Management

    UM3004 Front ends management Front ends management RF input impedance is 50 Ω. Passive antenna A passive antenna can be directly connected to Teseo-LIV4F/FM. Take care that the antenna must be close to the module. In addition, it could be possible that a matching component must be necessary to match the antenna. As RF_IN provides supply for antenna, a DC cut capacitor could be necessary in case antenna presents a DC GND short cut.

  • Page 10: External Lna

    UM3004 Front ends management External LNA External LNA means a passive antenna used with an LNA on the same PCB as Teseo-LIV4F/FM module. There are built-in LNA and SAW in the GNSS module. It is recommended to use an LNA with gain less than 36 dB and noise figure less than 1.5 dB.

  • Page 11: Active Antenna

    UM3004 Front ends management Active antenna There are built-in LNA and SAW in the GNSS module. It is recommended to use an active antenna with gain less than 36 dB and noise figure less than 1.5 dB. The active antenna can be supplied directly via RF_IN supply. Figure 7.

  • Page 12: Layout Recommendations

    For RF passive components, ST recommends using the 0402 (1 x 0.5 mm) components. Please choose the RF ground layer to be able to get 50 Ω RF line width as close as possible to components pads.

  • Page 13: Revision History

    UM3004 Revision history Table 2. Document revision history Date Version Changes 22-Mar-2022 Initial release. 22-Nov-2022 Add Section 5.3.1 Reset minimum timing. 29-Nov-2023 Updated Section Introduction. UM3004 - Rev 3 page 13/17...

  • Page 14: Table Of Contents

    UM3004 Contents Contents Pin out ................2 Power .
  • Page 15 UM3004 List of tables List of tables Table 1. Reset minimum timing ..............7 Table 2.
  • Page 16 UM3004 List of figures List of figures Figure 1. Pin out................2 Figure 2.
  • Page 17 ST’s terms and conditions of sale in place at the time of order acknowledgment. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of purchasers’...

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