SLWSTK6000A Datasheet, PDF (6/80 Pages) Silicon Laboratories – ConfidentialMighty Gecko Wireless SoC EFR32MG1X232

EFR32MG1X232 Data Sheet
System Overview
3.3.5 Transmitter Architecture
Confidential ^{The EFR32MG1X232 uses a direct-conversion transmitter architecture. For constant envelope modulation formats, the modulator con-}
trols phase and frequency modulation in the frequency synthesizer. Transmit symbols or chips are optionally shaped by a digital shap-
ing filter. The shaping filter is fully configurable, including the BT product, and can be used to implement Gaussian or Raised Cosine
shaping.
Automated PA up and down ramping is applied to each transmitted frame, in order to ensure the Adjacent Channel Power (ACP) meets
regulatory requirements.
Carrier Sense Multiple Access - Collision Avoidance (CSMA-CA) or Listen Before Talk (LBT) algorithms can be automatically timed by
the EFR32MG1X232. These algorithms are typically defined by regulatory standards to improve inter-operability in a given bandwidth
between devices that otherwise lack synchronized RF channel access.
3.3.6 Wake on Radio
The Wake on Radio feature allows flexible, autonomous RF sensing, qualification, and demodulation without required MCU activity, us-
ing a subsystem of the EFR32MG1X232 including the Radio Controller (RAC), Peripheral Reflex System (PRS), and Low Energy pe-
ripherals. Wake on Radio implementation may typically include the following functionality:
• Periodic trigger to start RF evaluation from the RTCC, GPIO or other low energy peripherals
• Received Signal Strength Indicator (RSSI) qualification
• Preamble and frame sync qualification
• Frame header qualification, including address filtering
• Autonomous packet demodulation and buffering
• Optional transfer of RSSI values to RAM via DMA
• Timeout to disable the receiver through the PRS in case of false alarm
3.3.7 RFSENSE
The RFSENSE module generates a system wakeup interrupt upon detection of wideband RF energy at the antenna interface, providing
true RF wakeup capabilities from low energy modes including EM2, EM3 and EM4.
RFSENSE triggers on a relatively strong RF signal and is available in the lowest energy modes, allowing exceptionally low energy con-
sumption. RFSENSE does not demodulate or otherwise qualify the received signal, but software may respond to the wakeup event by
enabling normal RF reception.
Various strategies for optimizing power consumption and system response time in presence of false alarms may be employed using
available timer peripherals.
silabs.com | Smart. Connected. Energy-friendly.
Preliminary Rev. 0.71 | 5