ASMgrid

 

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Accent's ASM221 addresses next generation metering needs for geographies such as Europe requiring advanced OFDM powerline communication including G3, PRIME, and IEEE P1901.2 as it becomes available. The ASM221 represents the industry's first single-chip meter solution to integrate an ARM® Cortex™-M3 processor system, energy measurement system, ample on-chip Flash (576 KB) and SRAM (96 KB), external SRAM/Flash/SDRAM support, and Accent's SUNFX™-PLC modem plus dedicated AFE.

 

The SUNFX-PLC modem's software-based, hardware accelerated architecture provides equipment manufacturers a cost-effective, flexible solution that provides in-field customizability and the ability to track standard changes. The SUNFX-PLC maintains the cost and low power benefits of fixed-function solutions, achieving the industry lowest power consumption for OFDM PLC applications such as G3-PLC. SUNFX-PLC implements OFDM techniques with a variety of modulation schemes and numerous modem features for maximum data rate and robustness. The dedicated AFE for PLC eliminates the need for external ADC, DAC, and numerous discrete components.

 

ASM221's energy measurement module integrates a high precision AFE and proprietary DSP for a best-in-class single-phase, residential metering solution, with added support for tamper detection. The ASM221 implements a powerful memory system for maximizing Cortex M3 performance and all meter processing including communication protocol and vendor application stacks. Software expandability is further supported via the ASM221's EMIF for numerous external memory types.

 

The ASM221's full-featured PMU simplifies power management and provides microamp operation in standby mode. The ASM221 supports a number of communication interfaces including SPI, I2C, and UART as well as hardware-based security mechanisms. Additional system capabilities includes multi-channel DMAs, general purpose ADC, temperature sensor, and GPIOs.

 

KEY PRODUCT AND PERFORMANCE FEATURES

  • SUNFX- PLC COMMUNICATION SYSTEM
    • Fully integrated advanced PLC modem and AFE, supporting:
      • G3-PLC, PRIME, ITU G.990x, IEEE P1901.2
      • G1, METERS AND MORE, as well as proprietary protocols
    • Complete, certified communication stacks as well as DLMS-COSEM
    • Innovative hybrid flexible and cost-optimized architecture
    • Support for OFDM with up to 256 subcarriers based on band of operation
    • DBPSK, DQPSK, D8PSK and QAM modulations
    • Frequency support for CENELEC, FCC and ARIB bands from 10 KHz to 490 KHz
    • Industry lowest PLC application power consumption (106 mW in continuous RX mode)
    • Very low cost external BOM including passives, power amplifier and transformer
  • ARM CORTEX-M3 AND ADVANCED MEMORY SYSTEM
    • Single processor for PHY, MAC, protocol, and complete meter processing
    • Ample available DMIPS and open platform for further software processing (112 DMIPS @ 90 MHz)
    • Integrated memory protection unit
    • On-chip Flash (576 KB) dual bank architecture to support robust firmware update
    • Cache memory:1 KB on embedded Flash, 2 KB 4-way set associative to SDRAM
    • 96 KB SRAM
    • Single chip 2 MB/8 MB SDRAM options
    • SPI Flash support
  • SECURITY FEATURES
    • Mechanical and electrical anti-tampering support
    • AES-128 Encryption Engine
    • ARM Cortex-M3 Memory Protection Unit
    • Secure Metrology Processing
    • Secure JTAG interface
  • SYSTEM AND COMMUNICATION PERIPHERALS
    • Serial communication: up to 2 SPI, 1 I2C, 4 UART
    • Real Time Clock: 32 KHz counter and alarms
    • Temperature compensation, calibration support
    • Embedded Temperature Sensor
    • ADC at up to 1 Msps
    • Up to 40 configurable GPIO pins
    • Four 32-bit timers, Watchdog timer
    • Two 4-channels DMAs
  • AEMET2: HIGH ACCURACY ENERGY MEASUREMENT
    • Supports single-phase, split-phase and three-phase residential and C&I applications
    • Frequency, RMS, active, reactive, apparent powers and power factor calculations
    • Total and fundamental only energy calculations
    • Synthetic voltage and current generator with programmable frequency, amplitude and phase
    • Accent ultra-small 64 bit DSP @ 36 MHz, enabling industry-best dynamic range
    • Software programmable enabling vendor customizations and additional energy applications
    • Support for CT, Shunt, and Rogowski Coil sensors
    • Measurement accuracy: 0.1%
    • Dynamic range: 10,000:1
    • Voltage reference: 30 ppm/°C
    • Applicable standards including IEC62053, ANSI C12.20, EN50470, IEC 61036 
  • OPTIMIZED POWER MANAGEMENT UNIT
    • RTC Standby Mode 1.3 uA
    • Brownout mode for a low-power system operation
  • PACKAGE
    • 128LQFP with additional 2 MB or 8 MB options
  • OPERATING CONDITIONS
    • Temperature range -40°C to 85°C
    • Voltage 1.8 – 3.6 V ( optional dual support 1.8/3.3 V)