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STCOMET：Smart meter and powerline communication system-on-chip

The STCOMET is a device that integrates a power line communication (PLC) modem, a high-performance application core and metrology functions.

The PLC modem architecture has been designed to target the EN50065, FCC, ARIB compliant PLC applications. Together with the application core, it enables the STCOMET to support the ITU-T G.9001, ITU-T G.9903 (G3-PLC^®), ITU-T G.9904 (PRIME), IEEE 1901.2, IEC 61334-5-1 (G1), CLC/TS 50568 (METERS AND MORE^®) and other narrow band PLC protocol specifications.

The metrology sub-system is suitable for EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22 and IEC 62053-23 compliant class1, class0.5 and class0.2 AC metering applications.

Key Features

• Integrated differential PLC analog front-end
  • PGA with automatic gain control and ADC
  • Current DAC with transmission predriver
  • Digital transmission level control
  • Zero crossing comparator
  • Up to 500 kHz PLC signal bandwidth
• Integrated dual line driver
  • 14 V p-p single ended, 28 V p-p differential output range
  • Very high linearity for EMC compliance
  • Externally configurable amplifier topology
  • 1 A rms max. current
  • Embedded overtemperature protection
  • Suitable for all PLC signals up to 500 kHz
• Fully reprogrammable real-time engine (RTE) modem for PLC standards up to 500 kHz
• High accuracy metering front-end
  • 3 independent 24-bit ΣΔ ADC channels
  • 3.6 kHz bandwidth
  • Dedicated DSP for turnkey calculation of metrology parameters
  • Direct access to 24-bit ΣΔ data
• Integrated application core: ARM® 32-bit Cortex™-M4F CPU
  • 96 MHz maximum frequency
  • 8-channel direct memory access controller
  • 8-region memory protection unit
  • Serial wire and JTAG interfaces
  • Cortex-M4 Embedded Trace Macrocell™
  • Up to 86 multiplexed GPIOs
  • 11 timers
  • 1 flexible CRC calculation unit
  • 5 USARTs (ISO 7816 compliant), 5 SPI, 3 I2 C
  • 12-bit general purpose ADC with 6 channels
• Cryptographic engine
  • AES 128/192/256 engine
  • True random number generator
• Memories
  • 640 kB or 1 MB of embedded Flash
  • 128 kB of embedded SRAM
  • 8 kB of embedded shared RAM
  • Flexible static memory controller
• Clock management
  • 24 MHz external crystal for system clock with internal QFS synthesizer
  • 32.768 kHz external crystal for RTC
• Power management
  • 3.3 V and 8 - 18 V external supply voltages
  • 1.2 V and 5 V integrated linear regulators
  • Normal and low power modes
• Real-time clock (RTC)
  • VBAT supply with battery health monitoring for RTC and backup registers
• -40 °C to +85 °C operating temperature range

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