Freescale Semi

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  • Sub1 GHz Low Power Node Solution Transceiver

  • Created: May 06, 2015

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This project is designed for wireless applications in the sub-1 GHz band using Freescale Semiconductor's MC12311CHN 8bit MCU. It is intended to operate both in the license-free ISM and SRD frequency bands at 315, 433, 470, 868, 915, 928, and 955 MHz. This configuration allows users to minimize the use of external components.

The MC12311CHN is a very low-power RF transceiver, intended for RF wireless applications in the sub-1 GHz band. The air data rate is programmable from 1 to 500 kbps, and the SPIRIT1 can be used in systems with channel spacing of 12.5/25 kHz, complying with the EN 300 220 standard. It uses a very small number of discrete external components and integrates a configurable baseband modem, which supports data management, modulation, and demodulation. The data management handles the data in the proprietary fully programmable packet format also allows the M-Bus standard compliance format (all performance classes).

Moreover, MC12311CHN supports an embedded CSMA/CA engine. An AES 128-bit encryption co-processor is available for secure data transfer. The SPIRIT1 fully supports antenna diversity with an integrated antenna switching control algorithm. The SPIRIT1 supports different modulation schemes: 2-FSK, GFSK, OOK, ASK, and MSK. Transmitted/received data bytes are buffered in two different three-level FIFOs (TX FIFO and RX FIFO), accessible via the SPI interface for host processing. With the aforementioned features, this design can be used in wireless alarm and security systems, industrial monitoring control, and automatic meter reading.