Описание
The 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 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 x 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(1)
- 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 boot loader 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(1)
- 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°C)
- Clock
- Optional 3 to 20 MHz quartz or ceramic resonator oscillators with clock failure detection
- Ultra-low-power 32.768 kHz crystal oscillator for RTC with 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
