ST Teseo-LIV4F Bedienungsanleitung

Introduction

Teseo-LIV4F is a GNSS modules sized 9.7 mm x 10.1 mm x 2.5 mm featuring STMicroelectronics positioning receiver TeseoIV.

It is a standalone positioning receiver which embeds the new ST GNSS positioning engine capable of receiving signals from

multiple satellite dual bands (L1 and L5) navigation systems, including GPS, Galileo and Glonass or BeiDou.

It embeds serial flash.

Teseo-LIV4F Hardware documentation

UM3004

User manual

UM3004 - Rev 1 - March 2022

For further information contact your local STMicroelectronics sales office.

www.st.com

1Pin out

In the following figure, the pin out of the module:

Figure 1. Pin out

LIV4F

GND RF

RF IN

GND RF

Reserved

VCC RF

Reserved

SDA

SCL

PRTRG

Main supply

Reset

GPIO

General ground pin

RF ground

Antenna connexion (50 Ω)

Antenna supply

I2C (internal pull-up)

Backup supply

PPS

UART Rx from MCU

UART Tx to MCU

RESETn

VCC

VBATT

EXTINT

PPS

UART_RX

B0/UART_TX

GND

Reserved

Mode pin

UM3004

Pin out

UM3004 - Rev 1 page 2/17

2Power

Teseo-LIV4F 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.

A startup or during low power application current can change suddenly. It is important to use power device

able to provide this current variation. Use LDO above 200 mA current.

•VBAT (pin 6)

VBAT is the supply for the low power domain backup: RAM and RTC. Its range can be from 1.8 V to 3.3 V.

It can be either connected to VCC or it can be supply by a dedicated supply always ON. VBAT supply can be

kept ON during low power mode to allow fast recovery of GNSS fix.

If no backup supply is available, leave VBAT pin floating.

2.1 VCC_RF (pin 14)

VCC_RF is an output supply for external active antenna. The current is limited below 35 mA.

2.2 Power supply design reference

For first PCB, it is recommended to plan to have some filtering components on Teseo-LIV4F power supplies as

follows:

Figure 2. Power supply filtering

Note: Decoupling capacitor must be placed close to module pin.

UM3004

Power

UM3004 - Rev 1 page 3/17

2.3 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

1MΩ

4.7µF

VIN 2.3V – 5.5V

470nH

ST1S15J18R

MODE

VIN

GND C2

4.7µF

LQM21PNR47MC0D

UM3004

Current consumption optimization

UM3004 - Rev 1 page 4/17

3Reserved (pin 7, pin 13 and pin 15)

In Teseo-LIV4F pin 7, pin 13 and pin 15 are reserved. Let the pin floating.

UM3004

Reserved (pin 7, pin 13 and pin 15)

UM3004 - Rev 1 page 5/17

4Interfaces

4.1 I2C (pin 16, pin 17)

I2C 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.

4.2 UART (pin 2, pin 3)

UART is Universal Asynchronous Receiver/Transmitter that supports much of the functionality of the industry-

standard 16C650 UART.

These UARTs vary from industry-standard 16C650 on some minor points which are:

• Receive FIFO trigger levels.

• The internal register map address space, and the bit function of each register differ.

• The deltas of the modem status signals are not available.

• 1.5 stop bits is not supported.

• Independent receive clock feature is not supported.

UM3004

Interfaces

UM3004 - Rev 1 page 6/17

5I/O pins

5.1 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 PPS (pin4 ).

5.2 EXTINT (pin 5)

It is a GPIO which, by default, is a trigger pin to external interrupt.

Leave it floating if not used.

5.3 RESETn (pin 9)

It can force a Teseo-LIV4F under reset.

Reset signal is active low.

Host processor must have full control of this pin to guarantee the Teseo-LIV4F’s firmware upgrade support. Do not

use pull-up or pull-down when connecting to MCU.

5.4 RF_IN (pin 10)

It is the RF input.

DC (equals to VCC voltage) is present Teseo-LIV4F version.

5.5 PRTRG (pin 18)

Keep PRTRG pin floating during system power-up or the external reset (RESETn from low to high), and the

module will enter User Normal Mode.

It’s a programming pin used to program the module in production line.

Leave PRTRG pin floating.

UM3004

I/O pins

UM3004 - Rev 1 page 7/17

6Standby mode

Standby mode is the mode where only low power backup domain is running and VCC is OFF. It means VBAT

must be always maintain. It allows to have very low current consumption and fast GNSS reacquisition at the end

of the standby time due to RTC.

Teseo-LIV4F offers 1 way of standby: HW standby.

As IO buffers are not supplied during standby mode, it is important to keep all IO without external voltage to avoid

any current leakage.

UM3004

Standby mode

UM3004 - Rev 1 page 8/17

7Front ends management

RF input impedance is 50 Ω.

7.1 Passive antenna

A passive antenna can be directly connected to Teseo-LIV4F. Take care that the antenna must be close to the

module. In addition, it could be possible that 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.

Figure 4. Passive antenna

LIV4F

RESETn

VCC

VBATT

EXTINT

PPS

UART_RX

B0/UART_TX

GND

GND RF

RF IN

GND RF

Reserved

VCC RF

Reserved

SDA

SCL

PRTRG

Reserved

56pF

UM3004

Front ends management

UM3004 - Rev 1 page 9/17

7.2 External LNA

External LNA means a passive antenna used with an LNA on the same PCB than Teseo-LIV4F module.

There is 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.

Here is a bloc diagram describing the connection:

Figure 5. External LNA control

LNA

VCC

LIV4F

RESETn

VCC

VBATT

EXTINT

PPS

UART_RX

B0/UART_TX

GND

GND RF

RF IN

GND RF

Reserved

VCC RF

Reserved

SDA

SCL

PRTRG

Reserved

UM3004

External LNA

UM3004 - Rev 1 page 10/17

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