STS1TX

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Low data rate, low power sub-1GHz transmitter

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Product overview

Description

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.

  • All 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

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STMicroelectronics - STS1TX

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STS1TXQTR
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VFQFPN 20 4x4x1.0 Industrial Ecopack3

STS1TXQTR

Package:

VFQFPN 20 4x4x1.0

Material Declaration**:

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Marketing Status

Active

Package

VFQFPN 20 4x4x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack3

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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