User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 3 Operating Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
®
ELS31-/ELS51-US Hardware Interface Overview
3 Operating Characteristics
30
ELS31-US_ELS51-US_HIO_v01.000a 2016-12-28
Confidential / Preliminary
Page 30 of 46
3 Operating Characteristics
3.1 Operating Modes
The table below briefly summarizes the various operating modes referred to throughout the
document.
3.2 Power Supply
ELS31-US/ELS51-US needs to be connected to a power supply at the SMT application inter-
face - 2 BATT lines and GND. There are two separate voltage domains for BATT:
• BATT_BB with a line mainly for the baseband power supply.
• BATT_RF with a line for the RF power amplifier supply.
Please note that throughout the document BATT refers to both voltage domains and power
supply lines - BATT_BB and BATT_RF.
The power supply of ELS31-US/ELS51-US has to be a single voltage source at BATT_BB and
BATT_RF. 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.
Table 6: Overview of operating modes
Mode Function
Normal
opera-
tion
LTE IDLE No data transfer is in progress and the USB connection is suspended
by host (or is not present) and no active communication via ASC0/
ASC1. In IDLE mode, the software can be active or in SLEEP state.
LTE DATA LTE data transfer in progress. Power consumption depends on network
settings and data transfer rate.
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 [1]).
In Airplane mode, the software can be active or in SLEEP state.