Specifications
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
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ELS81-US Hardware Interface Description
3.3 Power Saving
77
els81-us_hid_v01.004 2017-09-27
Confidential / Preliminary
Page 68 of 107
3.3.3 Wake-up via RTS0
RTS0 can be used to wake up ELS81-US from SLEEP mode configured with AT^SPOW.
Assertion of RTS0 (i.e., toggle from inactive high to active low) serves as wake up event, thus
allowing an external application to almost immediately terminate power saving. After RTS0
assertion, the CTS0 line signals module wake up, i.e., readiness of the AT command interface.
It is therefore recommended to enable RTS/CTS flow control (default setting).
Figure 38 shows the described RTS0 wake up mechanism.
Figure 38: Wake-up via RTS0
RTS0
CTS0
TXD0
RXD0
AT command
Reply URC
RTS assertion (falling edge)
Wake up from SLEEP mode
Return to SLEEP mode
RTS back