Gemalto M2M GmbH EMS31-VR1 ユーザーズマニュアル
Cinterion
®
EMS31-V Hardware Interface Overview
3 Operating Characteristics
19
EMS31_V_HIO_v00.004
2018-02-27
Confidential / Preliminary
Page 19 of 35
3
Operating Characteristics
3.1
Operating Modes
The table below briefly summarizes the various operating modes referred to throughout the
document.
document.
3.2
Power Supply
The power supply of EMS31-V has to be a single voltage source at BATT+. It must be able to
provide the current for all operation modes of the module.
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:
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.
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.
Table 5:
Overview of operating modes
Mode
Function
Normal
opera-
tion
Active TX
LTE data transfer in progress. Power consumption depends on network
settings, data transfer rate and radio conditions.
No data transfer is in progress and no active communication via ASC0/
ASC1.
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 inter-
faces can be present. Power consumption depends on the LTE power
saving mode and its parameters and on the activity on the ASC inter-
faces.
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.
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 connec-
tion.
Airplane mode can be controlled by AT command (see
).
Sleep mode can be entered when airplane mode is enabled.