Description

This reference design describes an ETSI Cat. 2 receiver-capable RF subsystem for smart meters: fully compliant with the most popular wM-Bus S: T and C-modes at 868 MHz as per EN13757-4:2014. The SimpleLink RF transceiver device delivers market leading blocking: selectivity and RX sensitivity numbers in wM-Bus applications: such as bi-directional flow meters: e-meters and heat cost allocators. This cost-optimized design handles the worst case frequency offset of +-60ppm in S2-mode by utilizing an inexpensive XTAL component. Neither an external SAW filter nor costly TCXO component are needed to meet the specification of the wM-Bus modes @ 868 MHz. Additionally: this design uses a ultra-low Iq DC/DC converter with dynamically adjustable output voltage: enables a new level of optimization of the design's power consumption: significantly extending the battery lifetime.