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Teseo-LIV4F Hardware documentation 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.
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...
VCC_RF is an output supply for external active antenna. The current is limited below 35 mA. 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.
UM3004 Current consumption optimization 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 –...
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.
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 ). EXTINT (pin 5) It is a GPIO which, by default, is a trigger pin to external interrupt.
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.
RF input impedance is 50 Ω. 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.
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.
UM3004 Active antenna Active antenna There is 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 6.
Layout recommendations Layout recommendations It is important to have a whole ground plane below Teseo-LIV4F module. Avoid any signals below Teseo-LIV4F. Do not place the module close to any EMI source, like antenna, RF routing, DC/DC or power conductor, clock signal or other high-frequency switching signal, etc.
UM3004 Contents Contents Pin out ................2 Power .
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UM3004 List of tables List of tables Table 1. Document revision history ............. 13 UM3004 - Rev 1 page 15/17...
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UM3004 List of figures List of figures Figure 1. Pin out................2 Figure 2.
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