TESEO-LIV3R datasheet(15/30 Pages) STMICROELECTRONICS

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DS12821 Rev 2

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Teseo-LIV3R

Power mode

Standby mode, is the mode where only low power backup domain is running. 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.

Teseo-LIV3R offers two different ways of standby:



Hardware standby



Software standby

8.1

Hardware standby

This standby is ensured by switching OFF VCC (pin 6) and VCC_IO (pin 7) supplies and

setting SYS_RESETn (pin 9) to 0 V. It can be activated asynchronously from GNSS binary

with one GPIO switching OFF the supplies from a host.

During this standby only VBAT (pin 6) is kept ON.

It ensures a current below 6 μA. During this standby mode VCC_RF (pin 14) is OFF.

8.2

Software standby

Software standby is activated by the internal binary.

Software standby can be:



Host driven standby: where the host sends a NMEA commands to force Teseo-LIV3R

into standby; host can be woken up by Teseo-LIV3R using the Wakeup pin (pin 5);



Periodic standby: where Teseo-LIV3R enters and exits from standby using internal

RTC. Periodic fixes are from 5 seconds up to 24 hours between 2 fixes.

It ensures a current below 12 μA on Teseo-LIV3R. Be careful that VCC_RF is ON during this

standby. In case of active antenna or external LNA, it is important to switch them OFF.

TESEO-LIV3R Datasheet(PDF) 15 Page - STMicroelectronics