MICROCHIP ATSAM4CMS8CC-AU

The Atmel | SMART SAM4CM series represents a family of system-on-chip solutions for residential and polyphase metering applications. The devices offer up to class 0.2 metrology accuracy over a dynamic range of 3000:1 within the industrial temperature range and are compliant with ANSI C12.20-2002 and IEC 62053-22 standards. A seamless extension of Atmel's SAM4, SAM4CP and SAM4C family of microcontrollers and solutions for smart grid security and communications applications, these metrology-enabled devices offer an unprecedented level of integration and flexibility with dual 32-bit ARM Cortex-M4 RISC processors running at a maximum speed of 120 MHz each, up to 2 Mbytes of embedded Flash, 304 Kbytes of SRAM and on-chip cache. The unique dual ARM Cortex-M4 architecture supports implementation of signal processing, application and communications firmware in independent partitions, and offers the ability to extend program and data memory via parallel external bus interface (EBI) to ensure scalability of the design to meet future requirements. The peripheral set includes metrology-specific precision voltage reference, up to seven (7) simultaneously sampled Sigma-Delta ADC subsystems supporting three (3) voltage and four (4) current measurement channels (polyphase versions only), an extensive set of embedded cryptographic features, anti-tamper, Floating Point Unit (FPU), four USARTs, two UARTs, two TWIs, four SPIs, three 16-bit PWMs, two 3-channel general-purpose 16-bit timers, 6-channel 10-bit ADC, battery-backed RTC with <1 μA consumption and a 38×6 segmented LCD controller. To ensure the distinct separation of metrology and application or communication functions, the SAM4CM integrates a dedicated Cortex-M4F core that manages all necessary metrology resources and memory.

• Application/Master Core
  • ARM Cortex-M4 running at up to 120 MHz
  • Memory Protection Unit (MPU)
  • DSP Instruction
  • Thumb-2 instruction set
  • Instruction and Data Cache Controller with 2 Kbytes Cache Memory
  • Memories
    • Up to 2 Mbytes of Embedded Flash for Program Code (I-Code bus) and Program Data (D-Code bus) with Built-in ECC (2-bit error detection and 1-bit correction per 128 bits)
    • Up to 256 Kbytes of Embedded SRAM (SRAM0) for Program Data (System bus)
    • 8 Kbytes of ROM with embedded bootloader routines (UART) and In-Application Programming (IAP) routines
• Coprocessor (provides ability to separate application, communication or metrology functions)
  • ARM Cortex-M4F running at up to 120 MHz
  • IEEE 754 Compliant, Single-precision Floating-Point Unit (FPU)
  • DSP Instruction
  • Thumb-2 instruction set
  • Instruction and Data Cache Controller with 2 Kbytes of Cache Memory
  • Memories
    • Up to 32 Kbytes of Embedded SRAM (SRAM1) for Program Code (I-Code bus) and Program Data (D-Code bus and System bus)
    • Up to 16 Kbytes of Embedded SRAM (SRAM2) for Program Data (System bus)
• Symmetrical/Asynchronous Dual Core Architecture
  • Interrupt-based Interprocessor Communication
  • Asynchronous Clocking
  • One Interrupt Controller (NVIC) for each core
  • Each Peripheral IRQ routed to each NVIC Input
• Cryptography
  • High-performance AES 128 to 256 with various modes (GCM, CBC, ECB, CFB, CBC-MAC, CTR)
  • TRNG (up to 38 Mbit/s stream, with tested Diehard and FIPS)
  • Public Key Crypto accelerator and associated ROM library for RSA, ECC, DSA, ECDSA
  • Integrity Check Module (ICM) based on Secure Hash Algorithm (SHA1, SHA224, SHA256), DMA-assisted
• Safety
  • Up to two physical Anti-tamper Detection I/Os with Time Stamping and Immediate Clear of General Backup Registers
  • Security Bit for Device Protection from JTAG Accesses
• Shared System Controller Power Supply
  • Embedded core and LCD voltage regulator for single-supply operation
  • Power-on-Reset (POR), Brownout Detector (BOD) and Dual Watchdog for safe operation
  • Ultra-low-power Backup mode (<0.5 μA Typical @ 25℃)
• Clock
  • 3 to 20 MHz oscillator supporting crystal, ceramic resonator or external clock signal. Also supports clock failure detection
  • Ultra-low power 32.768 kHz oscillator supporting crystal or external clock signal and frequency monitoring
  • High-precision 4/8/12 MHz factory-trimmed internal RC oscillator with on-the-fly trimming capability
  • One high-frequency PLL up to 240 MHz, one 8 MHz PLL with internal 32 kHz input, as source for high-frequency PLL
  • Low-power slow clock internal RC oscillator as permanent clock
• Ultra-low-power RTC with Gregorian and Persian Calendar, Waveform Generation in Backup mode and Clock Calibration Circuitry for 32.768 kHz Crystal Frequency Compensation Circuitry
• Up to 23 Peripheral DMA (PDC) Channels
• One Low-power Segmented LCD Controller
  • Display capacity of 38 segments and 6 common terminals
  • Software-selectable LCD output voltage (Contrast)
  • Low current consumption in Low-power mode
  • Can be used in Backup mode
• Up to four USARTs with ISO7816, IrDA, RS-485, SPI and Manchester Mode
• Two 2-wire UARTs with one UART (UART1) supporting optical transceiver providing an electrically isolated serial communication with hand-held equipment, such as calibrators, compliant with ANSI C12.18 or IEC62056-21 norms
• Up to two 400 kHz Master/Slave and Multi-Master Two-wire Interfaces (I²C compatible)
• Up to four Serial Peripheral Interfaces (SPI)
• Two 3-channel 16-bit Timer/Counters with Capture, Waveform, Compare and PWM modes
• Quadrature Decoder Logic and 2-bit Gray Up/Down Counter for Stepper Motor
• 3-channel 16-bit Pulse Width Modulator
• 32-bit Real-time Timer
• Energy Metering Analog Front-End
  • Two-phase (SAM4CMS) or three-phase (SAM4CMP) Energy Metering Analog Front-End
  • Works with the Atmel MCU Metrology library
  • Compliant with Electricity Metering Standards up to Class 0.2 (ANSI C12.20-2002 and IEC 62053-22)
  • Four or seven Sigma-Delta ADC measurement channels, 20-bit resolution, 102 dB dynamic range

• Residential and polyphase metering applications
• Smart grid security and communication applications