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
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ELS61-AUS Hardware Interface Description
3.3 Power Saving
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ELS61-AUS_HID_v00.031 2016-06-03
Confidential / Preliminary
Page 63 of 102
3.3 Power Saving
ELS61-AUS can be configured to control power consumption:
• Using the AT command AT^SPOW it is possible to specify a so-called power saving mode
for the module (<mode> = 2; for details on the command see [1]). The module‘s UART inter-
faces (ASC0 and ASC1) are then deactivated and will only periodically be activated to be
able to listen to network paging messages as described in Section 3.3.1 and Section 3.3.2.
See Section 3.3.3 for a description on how to immediately wake up ELS61-AUS again using
RTS0.
Please note that the AT^SPOW setting has no effect on the USB interface. As long as the
USB connection is active, the module will not change into its SLEEP state to reduce its func-
tionality to a minimum and thus minimizing its current consumption. To enable switching
into SLEEP mode, the USB connection must therefore either not be present at all or the
USB host must bring its USB interface into Suspend state. Also, VUSB_IN should always
be kept enabled for this functionality. See “Universal Serial Bus Specification Revision 2.0”
1
for a description of the Suspend state.
3.3.1 Power Saving while Attached to WCDMA Networks
The power saving possibilities while attached to a WCDMA network depend on the paging tim-
ing cycle of the base station.
During normal WCDMA operation, i.e., the module is connected to a WCDMA network, the
duration of a power saving period varies. It may be calculated using the following formula:
t = 2
DRX value
* 10 ms (WCDMA frame duration).
DRX (Discontinuous Reception) in WCDMA networks is a value between 6 and 9, thus result-
ing in power saving intervals between 0.64 and 5.12 seconds. The DRX value of the base sta-
tion is assigned by the WCDMA network operator.
In the pauses between listening to paging messages, the module resumes power saving, as
shown in Figure 35.
Figure 35: Power saving and paging in WCDMA networks
The varying pauses explain the different potential for power saving. The longer the pause the
less power is consumed.
1. The specification is ready for download on http://www.usb.org/developers/docs/