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基于Freescale公司的Kinetis KM34Z256智能电表解决方案

来源：中电网

2019-01-24

类别：工业控制

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拍明

原标题：Freescale Kinetis KM34Z256智能电表解决方案

　　freescale公司的Kinetis KM34Z256 MCU是基于低功耗ARM® Cortex®-M0+内核,工作频率75MHz并集成了计量算法硬件算法单元(MMAU),支持32/64位整数乘法,除法和平方根运算,比标准等效MCU的性能提高135%,和更高成本的ARM Cortex-M4 MCU相比,性能增加35%,适用于单芯片1,2和3相电表和流量计以及其它高精度测量应用.本文介绍了Kinetis KM34Z256主要特性,框图和塔式模块TWR-KM34Z75M主要特性,框图和电路图.

　　The new Kinetis KM34Z256 MCU is designed for 1-, 2- and 3-phase electricity meters, and features a 75MHz ARM® Cortex®-M0+ core plus metering algorithm hardware arithmetic unit (MMAU). The solution supports 32/64 -bit integer multiply, divide and square root operations and delivers a 135 percent performance increase over a standard equivalent MCU, and a 35 percent increase versus higher cost ARM Cortex-M4 MCUs. A sophisticated analog front end (AFE) enables high accuracy voltage and current measurement from four 24-bit Sigma-Delta analog-to-digital converters (ADCs) – each with its own low-noise programmable gain amplifier. Complementing these are a precision voltage reference with low gain drift of 6 ppm/C°, a dedicated hardware block for dynamic sensor phase shift compensation, and three analog comparators for frequency detection in meters that use Fast Fourier Transform (FFT) algorithms.

　　Enabling high accuracy, secure 1-, 2- & 3-phase electricitymetering solutions through a powerful analog front end (AFE),auto-compensated iRTC with hardware tamper detection,segment LCD controller, rich security protection and multiple lowpower features in a 32-bit ARMR CortexR-M0+ MCU. Thisproduct offers:

　　• Enabling single-chip 1-, 2- & 3-phase metering designs

　　• AFE, Security & HMI. Single crystal implementation

　　• Single point of calibration during manufacture

　　• Highest accuracy metrology with regional feature support

　　• Multiple ƩΔ ADCs with PGA

　　• Supports neutral disconnect use case

　　• Compliance with WELMEC/OIML recommendations

　　• Memory & peripheral protection

　　• Hardware tamper detect with time stamping

　　• Low-power RTC, battery backup with tamper memory

　　Kinetis KM34Z256主要特性:

　　Core

　　• ARMR CortexR-M0+ core up to 75 MHz

　　• Metering specific Memory Mapped Arithmetic Unit

　　(MMAU)

　　Clocks

　　• 75 MHz high-accuracy internal reference clock

　　• 32 kHz, and 4 MHz internal reference clock

　　• 1 kHz LPO clock

　　• 32.768 kHz crystal oscillator in iRTC power domain

　　• 1 MHz to 32 MHz crystal oscillator

　　• FLL and PLL

　　System peripherals

　　• Memory Protection Unit (MPU)

　　• 4-channel DMA controller

　　• Watchdog and EWM

　　• Low-leakage Wakeup Unit (LLWU)

　　• SWD debug interface and Micro Trace Buffer (MTB)

　　• Bit Manipulation Engine (BME)

　　• Inter-peripheral Crossbar Switch (XBAR)

　　Analog Modules

　　• 4 AFE channels (4× 24-bit ƩΔ ADCs with PGA)

　　• 16-channel 16-bit SAR ADC with 4 result registers

　　• High-speed analog comparator containing a 6-bit DACand programmable reference input

　　• Internal 1.2 V reference voltage 10–15 ppm/℃

　　Memories

　　• 256 KB program flash memory

　　• 32 KB SRAM

　　Operating Characteristics

　　• Voltage range: 1.71 to 3.6 V (without AFE)

　　• Voltage range: 2.7 to 3.6 V (with AFE)

　　• Temperature range (ambient): –40 to 105 ℃

　　Low power features

　　• 13 power modes to provide power optimizationbased on application requirements

　　• 7.69 mA @ 75 MHz run current

　　• Less than 171 μA/MHz very low power run current

　　• 6.05 μA very low power stop current

　　• Down to 220 nA deep sleep current

　　• VBAT domain current < 1 μA with iRTC operational

　　• Low-power boot with less than 2.33 mA peakcurrent

　　Communication interfaces

　　• 16-bit SPI modules

　　• Low-power UART module

　　• UART module complying with ISO7816-3

　　• Basic UART module

　　• I2C with SMBus

　　Timers

　　• Quad Timer (QTMR)

　　• Periodic Interrupt Timer (PIT)

　　• Low Power Timer (LPTMR)

　　• Programmable Delay Block (PDB)

　　• Independent Real Time Clock (iRTC)

　　Human-machine interface

　　• Up to 4×60 (8×56, 6×58) segment LCD controlleroperating in all low-power modes

　　• General purpose input/output (GPIO)

　　Security and integrity modules

　　• Memory Mapped Cryptographic Acceleration Unit(MMCAU) for AES encryption

　　• Random Number Generator (RNGA), complyingwith NIST: SP800-90

　　• Programmable Cyclic Redundancy Check (PCRC)

　　• 80-bit unique identification number per chip

　　图1.Kinetis KM34Z256框图

　　塔式模块TWR-KM34Z75M

　　The TWR-KM34Z75M microcontroller module is designed to work either in a standalone mode or as a part of the Freescale Tower System development board platform, a modular development platform that enables rapid prototyping and tool re-use through reconfigurable hardware. You can take your design to the next level and begin constructing your Tower System today.

　　The TWR-KM34Z75M is a Tower MCU Module featuring the MKM34Z256VLQ7 a Kinetis-M family (metering) microcontroller in a LQFP144 package with Sigma-Delta ADC and tamper detection with a secure real-time clock with independent battery supply. It is intended for use in the Freescale Tower System development board platform but can also operate in a standalone mode. An on-board OpenSDA debug circuit provides a SWD programming interface, USB to serial interface, and power supply input through a single mini-USB connector. An optional on-board sinus waveform generator allows emulating of electricity net signals for software development purposes.