Gemalto M2M GmbH EMS31-X Manuel D’Utilisation

®

3 Operating Characteristics



EMS31_US_HIO_v00.001

2018-09-21

Confidential / Preliminary

Page 19 of 33

The table below briefly summarizes the various operating modes referred to throughout the
document. 

The power supply of EMS31-X has to be a single voltage source at BATT+. It must be able to
provide the current for all operation modes of the module.

All the key functions for supplying power to the device are handled by the power management
section of the analog controller. This IC provides the following features:

•

Stabilizes the supply voltages for the baseband using low drop linear voltage regulators and
a DC-DC step down switching regulator.

•

Switches the module's power voltages for the power-up and -down procedures.

•

SIM switch to provide SIM power supply.

Overview of operating modes

Normal 

operation

Active TX

LTE data transfer in progress. Power consumption depends on net-

work settings, data transfer rate and radio conditions.

IDLE

No data transfer is in progress. The LTE part of the device can be in 

LTE DRX, LTE eDRX or LTE PSM mode. Activity on ASC0 /ASC1 

interfaces can be present. Power consumption depends on the LTE 

power saving mode and its parameters and on the activity on the 

ASC interfaces.

Sleep

The module is in low power consumption state. There is no activity inside the module 

but module preserves the state in which it was before entering the sleep mode, including 

the electrical states of the GPIOs. The module will enter sleep state only when the LTE 

part of the module is in LTE DRX, LTE eDRX or LTE PSM mode or if it is in airplane 

mode. To allow sleep mode the host application shall indicate via RTS lines that it has 

no intention to send data.

Power 

Down

Normal shutdown after sending the power down command. Software is not active. Inter-

faces are not accessible. Operating voltage remains applied.

Suspend mode is foreseen to be implemented in future product variants.

Suspend 

Mode

There is no any activity inside the module, only internal counter and circuit for wake-up 

mechanism are active. The module does not preserve the state in which it was before 

entering the suspend mode, including the GPIOs. Meaning, the state of the module after 

waking up from suspend will be the same as after restarting the module.

The module will enter suspend mode only when the LTE part of the module is in LTE DRX, 

LTE eDRX, LTE PSM mode or if it is in airplane mode. To allow suspend mode the host 

application shall indicate via RTS lines (Legacy mode) or via GPIO25 (Advanced mode)

that it has no intention to send data.

Airplane 

mode

Airplane mode shuts down the radio part of the module, causes the module to log off from 

the LTE network and disables all AT commands whose execution requires a radio con-

nection.

Airplane mode can be controlled by AT command (see 

).

Sleep mode can be entered when airplane mode is enabled.