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
- 3.1 Operating Modes
- 3.2 Power Up/Power Down Scenarios
- 3.3 Power Saving
- 3.4 Power Supply
- 3.5 Operating Temperatures
- 3.6 Electrostatic Discharge
- 3.7 Blocking against RF on Interface Lines
- 3.8 Reliability Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
®
ELS61-AUS Hardware Interface Description
3.2 Power Up/Power Down Scenarios
73
ELS61-AUS_HID_v00.031 2016-06-03
Confidential / Preliminary
Page 60 of 102
3.2.4 Turn off ELS61-AUS
To switch the module off the following procedures may be used:
• Software controlled shutdown procedure: Software controlled by sending an AT command
over the serial application interface. See Section 3.2.4.1.
• Hardware controlled shutdown procedure: Hardware controlled by disconnecting the mod-
ule‘s power supply lines BATT+ (see Section 3.2.1.1).
• Automatic shutdown (software controlled): See Section 3.2.5
- Takes effect if ELS61-AUS board temperature or voltage levels exceed a critical limit.
3.2.4.1 Switch off ELS61-AUS Using AT Command
The best and safest approach to powering down ELS61-AUS is to issue the appropriate AT
command. This procedure lets ELS61-AUS log off from the network and allows the software to
enter into a secure state and safe data before disconnecting the power supply. The mode is
referred to as Power Down mode. In this mode, only the RTC stays active.After sending
AT^SMSO command DO NOT enter any other AT commands. To verify that the module is
turned off it is allowed to monitor the PWR_IND signal (see Section 2.1.13.2). Note that a high
state of the PWR_IND signal line indicates that the module is switched off.
Be sure not to disconnect the operating voltage V
BATT+
before V180 pad has gone low. Other-
wise you run the risk of losing data. The system power down procedure may take up to a few
seconds.
While ELS61-AUS is in Power Down mode the application interface is switched off and must
not be fed from any other voltage source. Therefore, your application must be designed to
avoid any current flow into any digital pads of the application interface.
Figure 34: Switch off behavior
BATT+
VCORE
V180
VDDLP
AT^SMSO System power down procedure Power down
EMERG_RST
ON