The STS1TX is a very low-power RF transmitter 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 frequencies in the 300-348, 387-470, and 779-956 MHz bands. The air data rate is programmable from 1 to 500 kbps, and the STS1TX can be used in systems with channel spacing of 12.5/25 kHz, complying with the EN 300 220 standard. It uses very few discrete external components and integrates a configurable baseband modem, which supports data management and modulation. The data management handles the data in the proprietary fully-programmable packet format, and also allows the M-Bus standard compliance format (all performance classes).
●An AES 128-bit encryption co-processor is available for secure data transfer. The STS1TX supports different modulation schemes: 2-FSK, GFSK, OOK, ASK, and MSK. Transmitted data bytes are buffered in FIFO (TX 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 (21 mA TX at +11 dBm)
● Programmable channel spacing (12.5 kHz min.)
● Programmable output power up to +16 dBm
● Fast startup and frequency synthesizer settling time (6 μs)
● Integrated temperature sensor
● Battery indicator and low battery detector
● TX FIFO buffer (96 bytes each)
● Configurability via SPI interface
● AES 128-bit encryption co-processor
● Fully integrated ultra low power RC oscillator
● Wakeup on internal timer and on external event
● Flexible packet length with dynamic payload length
● Automatic CRC handling
● FEC with interleaving
● 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 85 °C
