TESEO-LIV3F datasheet(20/37 Pages) STMICROELECTRONICS

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Power mode

Teseo-LIV3F

20/37

DS12152 Rev 7

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-LIV3F offers two different ways of standby:



Hardware standby



Software standby

9.1

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.

9.2

Software standby

Software standby is activated by the internal binary.

Software standby can be:



Host driven standby: where the host raises a NMEA commands to force Teseo-LIV3F

in standby; host can woken up Teseo-LIV3F using the Wakeup pin (pin 5);



Periodic standby: where Teseo-LIV3F 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-LIV3F. Be careful that VCC_RF is ON during this

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

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