User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 UICC/SIM/USIM Interface
- 2.1.7 Digital Audio Interface
- 2.1.8 Pulse Code Modulation Interface (PCM)
- 2.1.9 Inter IC Sound Interface (I2S)
- 2.1.10 GPIO Interface
- 2.1.11 I2C Interface
- 2.1.12 SPI Interface
- 2.1.13 Pulse Counter
- 2.1.14 HSIC Interface (ELS51-VA Only)
- 2.1.15 SDIO Interface (ELS51-VA Only)
- 2.1.16 Control Signals
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 2.1 Application Interface
- 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
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ELS31-VA/ELS51-VA Hardware Interface Description
3.2 Power Up/Power Down Scenarios
76
ELS31-VA_ELS51-VA_HID_v01.000 2017-01-04
Confidential / Preliminary
Page 60 of 106
3.2.2 Restart ELS31-VA/ELS51-VA
After startup ELS31-VA/ELS51-VA can be re-started as described in the following sections:
• Software controlled reset by AT+CFUN command: Starts Normal mode (see Section
3.2.2.1)
• Hardware controlled reset by EMERG_RST line: Starts Normal mode (see Section 3.2.2.2)
3.2.2.1 Restart ELS31-VA/ELS51-VA via AT+CFUN Command
To reset and restart the ELS31-VA/ELS51-VA module use the command AT+CFUN. See [1]
for details.
3.2.2.2 Restart ELS31-VA/ELS51-VA Using EMERG_RST
The EMERG_RST signal is internally connected to the central GSM processor. A low level for
more than 10 milliseconds sets the processor and with it all the other signal pads to their re-
spective reset state. The reset state is described in Section 3.2.3 as well as in the figures show-
ing the startup behavior of an interface.
After releasing the EMERG-RST line, i.e., with a change of the signal level from low to high,
the module restarts. The other signals continue from their reset state as if the module was
switched on by the ON signal.
Figure 33: Emergency restart timing
BATT_BB
ON
EMERG_RST
VCORE
V180
>10ms
System
started
System
started again
Reset
state
Ignition