Power-line communications chipset simplifies smart meter design
The turnkey chipset consolidates protocol handling to package and adapt data so it can be transmitted and line driving for sending over mains wires. It enables designers to implement powerline communications cost-effectively, either as part of new designs or as the core of an add-on module on older devices.
The chipset also works for markets with specific regulatory requirements as the PLC-modem chipset acts as an external communication module that interfaces with either the existing or a new metering or controlling device. The two-chip set consists of the ST8500 programmable PLC engine and STLD1 line-driver.
The ST8500 is a System-on-Chip (SoC) IC containing a quad-core DSP for real-time protocol processing, and an ARM Cortex-M4F core for upper-layer processing and system management. Each has its own code and data SRAM on-chip, and a dedicated set of peripherals focused on smart-energy applications is provided, including an AES cryptographic engine.
The Analogue Front End (AFE) for connecting to the STLD1 line driver is also integrated. It consumes less than 100mW in receive mode, ensuring ultra-low-power performance in line with the latest specifications to minimize the grid load imposed by new smart meters.
The STLD1 line driver communicates reliably, even across noisy cables and with low impedance, with high-drive capability and high linearity over a wide output range of 18V in single-ended or 36V in differential mode.
“ST has been serving the leading smart-meter manufacturers since the roll-out of the first generation of digital meters, with more than 60 million chipsets deployed in homes and buildings across Europe, China, and the Americas,” said Domenico Arrigo, General Manager Industrial and Power Conversion Division, STMicroelectronics.
“Building on the lessons from this first phase, next-generation metering and other IoT programs across the world have new design requirements, to which our new chipset is the best answer: a flexible and cost-effective PLC connectivity solution with full programmability to enable simpler global deployment in support of the different PLC standards.”
Market research firm IHS Markit says the industry is shipping more than 100 million smart meters a year, and expects a market growth of more than 8% through 2021. Three leading global smart-meter manufacturers are already designing solutions based on this new platform.
The chipset is supplied with certified G3-PLC and PRIME power-line protocol stacks and complies with CENELEC, FCC, and ARIB frequency-band regulations.
The chipset is in production and available now. The ST8500 SoC is packaged as a 7mm x 7mm x 1mm QFN56, and the STLD1 is a 4mm x 4mm x 1mm QFN24.
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