9

Power mode

Standby mode, is the mode where only a low-power backup domain is running. It means that VBAT must be

always maintained. It allows to have a very low current consumption and fast GNSS reacquisition at the end of

the standby time due to RTC.

Teseo-LIV3FL offers three different ways of standby:

•

Hardware standby

•

Software standby

•

Hardware off standby

9.1

Hardware standby

This standby is ensured by setting nReset (pin 9) to 0 V.

During this standby, only VCC (pin#8), VBAT(pin#6) and VCC_IO(pin#7) are kept ON.

During this standby, mode VCC_RF (pin 14) is ON.

9.2

Software standby

Software standby is activated in the internal binary. Software standby can be:

•

Host driven standby: where the host raises an NMEA command to force Teseo-LIV3FL in standby; the host

can be woken up Teseo-LIV3FL using the wake-up pin (pin 5);

•

Periodic standby: where Teseo-LIV3FL enters and exits from standby using the internal RTC. Periodic fixes

are from 5 seconds up to 24 hours between two fixes.

Make sure that VCC_RF is active during this standby. In the case of active antenna or external LNA, it is

important to turn them off.

9.3

Hardware off standby

This standby is ensured by switching OFF VCC (pin 8) and VCC_IO (pin#7) supplies and setting nReset (pin#9)

to 0 V. It can be activated asynchronously from the GNSS track with a GPIO turning off power from a host.

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

During this standby, mode VCC_RF (pin#14) is OFF.

Teseo-LIV3FL

Power mode

DS13881 - Rev 4

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