SPIRIT1  

The SPIRIT1 is a very low-power RF transceiver, intended for RF wireless applications in the sub-1 GHz band. It is designed to operate both in the license-free ISM and SRD frequency bands at 169, 315, 433, 868, and 915 MHz, but can also be programmed to operate at other additional frequencies in the 300-348 MHz, 387-470 MHz, and 779-956 MHz bands. 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).

However, the SPIRIT1 can perform cyclic redundancy checks on the data as well as FEC encoding/decoding on the packets. The SPIRIT1 provides an optional automatic acknowledgement, retransmission, and timeout protocol engine in order to reduce overall system costs by handling all the high-speed link layer operations.

Moreover, the SPIRIT1 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.

Key Features

• Frequency bands: 150-174 MHz, 300-348 MHz, 387-470 MHz, 779-956 MHz
• Modulation schemes: 2-FSK, GFSK, MSK, GMSK, OOK, and ASK
• Air data rate from 1 to 500 kbps
• Very low power consumption (9 mA RX and 21 mA TX at +11 dBm)
• Programmable RX digital filter from 1 kHz to 800 kHz
• Programmable channel spacing (12.5 kHz min.)
• Excellent performance of receiver sensitivity (-118 dBm), selectivity, and blocking
• Programmable output power up to +16 dBm
• Fast startup and frequency synthesizer settling time (6 μs)
• Frequency offset compensation
• Integrated temperature sensor
• Battery indicator and low battery detector
• RX and TX FIFO buffer (96 bytes each)
• Configurability via SPI interface
• Automatic acknowledgment, retransmission, and timeout protocol engine
• AES 128-bit encryption co-processor
• Antenna diversity algorithm
• Fully integrated ultra low power RC oscillator
• Wake-up on internal timer and wake-up on external event
• Flexible packet length with dynamic payload length
• Sync word detection
• Address check
• Automatic CRC handling
• FEC with interleaving
• Digital RSSI output
• Programmable carrier sense (CS) indicator
• Automatic clear channel assessment (CCA) before transmitting (for listen-before-talk systems). Embedded CSMA/CA protocol
• Programmable preamble quality indicator (PQI)
• Whitening and de-whitening of data
• Wireless M-BUS, EN 300 220, FCC CFR47 15 (15.205, 15.209, 15.231, 15.247, 15.249), and ARIB STD T-67, T93, T-108 compliant
• QFN20 4x4 mm RoHS package
• Operating temperature range from -40 °C to 105 °C