STS1TX:Low data rate, low power sub-1GHz transmitter

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
Product Specifications
DescriptionVersionSize
DS9878: Low data-rate, low power sub 1 GHz transmitter1.02 MB
Brochures
DescriptionVersionSize
Wireless connectivity for IoT applications2.02 MB
Sample & Buy
Part NumberPackagePacking TypeOperating Temperature (°C) (min)Operating Temperature (°C) (max)Unit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
STS1TXQTRVFQFPN 20 4x4x1.0Tape And Reel-40851.0510005A002A1A5A992CPHILIPPINES
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
STS1TXQTRVFQFPN 20 4x4x1.0IndustrialEcopack3
Low data-rate, low power sub 1 GHz transmitter STS1TX
ST7540 power line modem firmware stack STEVAL-IHP005V1