CC1021RSSR - Narrowband FSK/OOK UHF Transceiver | TI

The Texas Instruments CC1021RSSR is a true single-chip, low-power narrowband FSK/GFSK/OOK UHF RF transceiver operating in the 402 MHz to 470 MHz and 804 MHz to 960 MHz bands, supporting channel spacings of 50 kHz or higher, with a maximum data rate of 153.6 kBaud, packaged in a 32-pin VQFN (RSS) exposed-pad package rated from -40C to +85C.

A narrowband RF transceiver is a radio IC that transmits and receives digitally modulated data over a shared radio channel using narrow channels (here 50 kHz or more), maximizing spectral efficiency in congested license-free ISM/SRD bands. Within the system hierarchy, the CC1021 sits at the physical layer of a wireless link: it is a half-duplex transceiver - containing both a transmitter chain and a superheterodyne-style receiver chain - that pairs with an external MCU which configures it and feeds it data through its serial interface.

Key features include true single-chip integration (only the antenna matching network and crystal are external), multichannel operation with programmable channel spacing of 50 kHz or higher, three modulation schemes (FSK, GFSK, OOK), and very low power consumption aimed at battery-operated nodes. The supported data rate reaches 153.6 kBaud, sufficient for metering, alarm, and telemetry payloads. Output power is programmable, with -20 dBm listed among the supported output-power settings for short-range SRD compliance.

Technically, the CC1021 is fabricated in CMOS and integrates the complete frequency synthesis, modulation, demodulation, and baseband filtering functions on one die. It targets the 433, 868, 915, and 960 MHz ISM/SRD bands, making it suitable for regulatory environments in Europe, North America, and Asia. According to the TI datasheet (document SWRS045C), the device is optimized for very low voltage, very low power wireless applications.

Typical applications include Automatic Meter Reading (AMR) networks, wireless alarm and security systems, home automation, low-power telemetry, Remote Keyless Entry (RKE), Tire Pressure Monitoring Systems (TPMS), and general Short Range Device (SRD) links - all cases where narrowband channels and long battery life matter more than raw throughput.

Design consideration: because channel spacing is narrow (50 kHz class), crystal accuracy and proper frequency planning dominate link reliability; budget for crystal tolerance and use the datasheet frequency-programming registers rather than assuming fixed-band defaults.

This page synthesizes distributor availability data, datasheet-derived specifications, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet, providing unique engineering value for sourcing and design decisions. Pricing and stock levels are quoted as of 2026-10-19 where available.