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