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工业"自主系统"需要靠谱的微控制器

2018-7-9 11:16| 发布者: admin| 查看: 6113| 评论: 270

—— TI 带传感、连接或DSP的MCU很靠谱

  自主系统离不开三部分

本文引用地址:http://www.eepw.com.cn/article/201805/379364.htm

  (微控制器)在工业应用中看到很大的发展空间。无论是在“工业4.0”还是在“中国制造2025”,工业自动化都被提及。无论是哪类自动化领域,都可以看到这三个部分——感知、连接,控制和处理。

图片1.png

  它们的共性是都需要较强的系统知识,产品具有坚固耐用性,有很强的质量和可靠性,能够提供长期供货支持。

  此外,工业很难用一颗芯片满足所有应用的需求,需要多代和多样性产品。例如无线应用就很多样,有不同的无线标准,诸如BLE、Zigbee、sub-1GHz、WiFi等,因此需要满足不同标准的一整套产品,以适合不同标准、频率、存储等需求,最好还能实现芯片间的引脚兼容、软件兼容,再集成部分模拟和传感器等。因此平台化产品彰显优势。

  的三类齐头并进

  近日,德州仪器()半导体事业部中国区业务拓展总监吴健鸿先生来京,向媒体介绍了的嵌入式处理器战略。

图片2.png

  主要围绕传感、连接和处理。并介绍了近期发布的三款新产品:

  *采用TICapTIvate技术的电容式触摸,可实现金属触摸;

  *带无线功能的第六代SimpleLink MCU平台;

  *面向成本敏感的C2000微处理器。

  感知和测量

  有很多固定的传感器已经集成在MCU或处理器里。例如TI有专门为传感器去设计的产品,像毫米波(mmWave)的传感器把“DSP+毫米波传感器”集成在同一块芯片里。MSP430系列MCU有很多不同的传感应用,例如很早以前TI就有专门为烟感器做的MCU,还有2017年发布的为水表发布的超声波MCU。

  TI最新推出了带电容式触摸的MCU——MSP430系列的FR2512产品,可实现强大的电容式触摸屏的功能。实际上,TI在过去两年里做了很多改善和开发,这款产品有16个按键。最大的亮点是可以实现金属触摸,而目前大都是塑胶或玻璃介质。金属触摸非常适合工业应用,因工业环境通常比较苛刻,往往需要按键有超过五年、十年的操作时间,所以在这方面,金属触摸屏会比较适用。例如工业电梯的按钮。

图片3.png

  图 FR2512的防水演示(左)与开发板(右)

  那么,市面上还有触摸IC,与之相比,触摸MCU的优势是什么?吴健鸿先生称,触摸MCU的优势是除了触摸按键功能以外,还能跑很多MCU程序。而触摸IC只有一个I2C输出,没有其他功能。因此主要看客户的应简单还是复杂,如果是普通的标准按键——只有三五个按键,应用情景较为简单,后期无需调整改变,触摸IC即可。但很多工业应用情景较为复杂,例如有放误触发的情况,触摸MCU的优势是可编程,滤波器等特别功能程序可以在MCU上运行,因此可以提供特定的方案给客户。

  处理与控制

  传感器把不同的数据搜集汇聚,有可能在云端做一些运算,也有可能在本地做实时处理和控制。所以在本地处理和控制角度,TI有处理器、DSP或是一些带DSP内核的MCU。产品有包括基于Arm核的Sitara系列的处理器(MPU)。

  另外TI还有带DSP内核专门去做实时控制的MCU——C2000系列,优势是有DSP内核,同时有一个速度很快的ADC(模数转换器)——可以很快地搜集数据,同时也有很精准的PWM等,适合控制马达、数字电源等。

  2018年2月,TI推出了F28004X,是C2000 Piccolo微控制器家族的最新产品,其最大的优势在于是面向很多成本比较敏感的电容控制或者电机控制。另外,28004X与以往C2000产品都是软件兼容的。F28004X非常适合电动汽车车载充电器、电机控制逆变器和工业电源等成本敏感性应用的电源控制进行优化。

图片4.png

  连接

  在工业领域有一些与一般的消费应用不同的连接需求,在这方面TI有完整的方案可以提供给客户——无论是无线、有线的工业通讯。

  TI的SimpleLink MCU主要是面向与无线连接相关的应用。优势如下。

  在工业连接方面,无法用一种类型的连接方式达到互联互通的目的。因为在很多工业应用场合里,需要处理的环境不同,在某些环境里,有可能WiFi或BLE适用;有的情况下,sub-1GHz适用。TI的SimpleLink系列产品有170多种型号,涵盖大部分无线标准。

图片5.png

  图:演示了Thread网络。左图电脑中显示了控制(TI美国总部Dallas)状态。TI工作人员打电话给Dallas的总部人员调节电脑中的一个控制,右图对应的末端节点(现场,北京)就会动作,这些末端节点右侧有边缘路由器,使Wi-Fi与Thread网络相连

  TI的MSP430、432系列以及CC系列产品都在SimpleLink产品家族里。所有MCU都在同一个平台里的优势是,所以如果用户过去已在MCU应用里进行了开发,例如在有线 I2C MCU开发了一些应用,可以很快地转移到无线产品。而且当你做好了BLE应用,如果要很快地转移到不同的无线标准时,这个平台里都是很方便实现的。因为TI有统一的API,并且在底层有很多不同的标准和协议。

  最新的SimpleLink MCU如今已经到了第六代产品,无论从兼容性、稳定性等很靠谱。

  在SimpleLink的产品,TI的新品是CC家族的两个产品,都基于Cortex-M4内核。其他优势如下。

  *CC1352R。是多波段产品,可以支持2.4GHz,诸如ZigBee、BLE标准,除此之外还可以跑sub-GHz。即可以在同一个芯片里跑不同的频段。另外在数据上传部分增加了flash(闪存),有352KB flash。那么为什么是352KB,似乎有点少?实际上,这款产品与友商产品不同,因为TI有很多的标准功能和协议已经提前放在ROM里,因此352KB里的flash不需要跑无线部分,352KB主要给客户运行自己的控制软件,所以是足够的。

  *CC2652R。该平台最主要是支持2.4GHz频率,即多标准无线MCU。何谓多标准无线MCU?以前很多客户在设计Zigbee的时候,就会买一个Zigbee的芯片,当你设计BLE的时候,会买一个BLE的芯片。可是也有很多的客户,他们有可能一天有一个客户要做BLE的电子锁,第二天另外一个客户要一个Zigbee的电子锁,在这样情况下,以前的客户通常要开发两套方案,非常耗时。在CC2652R平台里,用一颗芯片里,可以标配不同的无线标准,甚至可以同时跑多标准。

  同样,在CC2652R MCU里也有352KB flash,有80KB的SRAM。同时特别在这个应用里,TI有很好的保密加速器,可以方便客户更安全地去保护他们的数据。

  另外,这颗CC2652R与之前版本的芯片2650芯片是完全兼容的。

  *如果客户除了无线的连接需求,还有一些有线的连接需求,诸如以太网,TI在MSP43系列有MSP432产品,基于Arm Cortex-M4内核。

  MSP432不带无线功能,MSP432的P4系列产品有以太网连接。

  启用从传感器到云的自治系统

  当讲到连接,需要考虑与云端服务连接。TI与全球各地的云端服务器都有连接,把他们的协议放在TI产品上面。

图片6.png

          在美国也是看了一些市场分析,当很多器件与网连起来以后,发现有82%的控制效率大为提高,而且有49%的用户通过大数据的分析,可以很快地把产品存在的隐患或问题很方便地找出来,从而提高生产效率。

  “TI很多客户采用了SDK觉得很方便,可能几天的时间就能直接与网连接起来。”吴健鸿称。

  小结

  TI在整个自主网络里最主要是做三个部分:传感感知;连接;处理控制。TI有全面可靠的产品。


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