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在科技飞速发展的当下,传感器作为获取信息的关键部件,正以前所未有的速度改变着人们的生活与产业格局。MEMS气压传感器,更凭借高精度、低功耗和小尺寸优势,广泛渗透于智能设备、工业制造等诸多领域,市场规模持续扩张。

在正在进行的慕尼黑上海电子展中,兆易创新(N5馆701展位)展示了基于GDY1122防水型高精度气压传感器方案,该方案具备10ATM防水等级,性能卓越,适用于严苛环境下的精准压力测量。兆易创新凭借强大的研发实力,构建了丰富且差异化的MEMS气压传感器产品组合,全面覆盖不同市场需求。公司持续推动技术创新,打造了完善的Sensor技术平台矩阵,并通过实施“3高1低1优”战略,不断突破技术瓶颈,推动行业发展潮流。

气压感知新势力

MEMS气压传感器以其高精度、低功耗和小尺寸的显著优势,深度融入现代生活的各个场景。在室内环境中,MEMS气压传感器便成为楼层定位的隐形标尺,能够捕捉到极其细微的大气压差,在摩天大楼中实现米级的高度识别。在三维定位领域,MEMS气压传感器与GPS、陀螺仪组成传感器矩阵,有效填补了传统定位技术的垂直盲区。在运动健康监测方面,MEMS气压传感器也展现出了独特的应用价值。登山者攀登时,手腕上佩戴的智能设备可利用其功能,悄然化身气压监测仪,提前预判高原反应风险;游泳爱好者佩戴的智能手环,也能借助该传感器构建水下安全警报系统。

日本和美国等国家规定,手机需具备定位人的高度的功能,以应对紧急情况下救援,因此MEMS气压传感器成为手机的标配产品。而且,这一配置正逐渐下沉到更多产品中,甚至包括一些儿童手表中。

在MEMS气压传感器领域,兆易创新公司已经拥有一套清晰且具有前瞻性的产品组合。普通型气压计GDY1121,作为面向手机市场的主力产品,已顺利通过E911测试。在防水型气压计产品方面,兆易创新的产品图谱上也有多款差异化产品。其中,GDY1122已成功在国际知名厂商的产品中实现量产,展现出优异的市场竞争力,该产品具备水下100米深度防水能力。GDY1124则针对中低端穿戴设备市场,支持水下50米防水。两款芯片在核心性能上保持一致,GDY1124的推出,旨在为那些对成本更为敏感、且防水需求较低的客户,提供更具性价比的解决方案。这些产品方案,无论是在高端市场追求极致性能,还是在中低端市场注重成本效益,都能充分满足不同客户、不同应用场景的多样化需求。

从节能先锋到防水强者

兆易创新已经量产的两款产品,充分展示了其在MEMS领域的创新能力。其中,GDY1121以卓越的能效表现脱颖而出,其1Hz采样率下功耗仅3.5μA,工作模式典型电流更低至154μA,均低于业内平均水平,可称微型传感器的节能标杆。该产品搭载精准压力捕捉技术,绝对精度达±0.5hPa,相对精度±0.06hPa,RMS噪声低至0.1Pa,结合24bit高精度ADC,可实现亚帕斯卡级数据解析能力,满足严苛环境下的测量需求。

其智能数据管理架构内置576字节大容量FIFO,支持灵活中断功能,并直接输出校准后压力值,省去外部MCU算法处理环节,显著降低系统复杂度与开发周期,打造即插即用的传感解决方案。此外,GDY1121集成高灵敏度温度传感器,已成功应用于三防手机等高可靠性场景,通过48小时稳定性测试(偏差<5.6Pa),验证其全天候稳定性能。

作为GDY1121的加强型,GDY1122支持10ATM防水等级,远领先于同类产品。其封装尺寸为2.7x2.7x1.7mm,绝对压力精度±0.5hPa,相对精度±0.06hPa,ADC精度达24bit。防水等级高达10ATM,能适应严苛环境。

GDY1122的另一卓越之处就在于出色的防水封装工艺。其采用陶瓷封装增加温度稳定性与抗应力能力。在关键的防水胶方面,传统产品在外层多采用透明胶,如果直接被阳光照射,将会引起精度的偏差,GDY1122则进行了技术革新,可在阳光直射下也保持数据的稳定。

推力测试是模拟传感器在安装或使用中受到的机械推力(如按压、挤压),验证微机械结构的抗形变能力的一个经典测试,可模拟可穿戴设备中的气压计需承受的日常压力等场景。GDY1122的该项测试成绩为显示封装强度超3500g规格(实测达4000~5000g),可以满足严苛环境需求。

MEMS传感器所面临的技术瓶颈主要集中在器件对应力和温度的高敏感性等方面。由于产品在实际应用中会受到自身所测压力、环境温度以及外界压力的共同作用,这使得最终测量数据的绝对精度受到较大干扰。为确保产品性能,在研发过程中,兆易创新针对产品的外形封装开展了严谨细致的验证工作,将外界因素对产品的影响降至了最低水平。

展望今年,兆易创新还将重点推出一款高阶气压传感器产品,不仅具备精确的气压测量功能,还集成了先进的水深测量能力。该产品的气压测量范围覆盖300至1250hPa,相当于标准大气压范围;水压测量则可达300至4000hPa,支持水下30米深度的精准检测。这一产品将主要应用于高端市场,为追求极致性能的客户提供理想的解决方案。

打造Sensor技术平台矩阵

兆易创新在传感器领域的目标是深耕传感器、信号链、算法及解决方案,做全生态的重要贡献者。围绕这一目标,兆易创新在Sensor业务领域构建了4个技术平台:分别为电容技术平台、光谱技术平台、MEMS技术平台、算法和解决方案,各平台相辅相成,能为不同行业提供多样化、高性能的传感器产品及解决方案。

电容技术平台:以自容、互容检测技术为核心,利用高精度ADC和高信噪比AFE、信号链,实现对电容变化的精确测量和信号处理。在手机、PC、平板指纹识别以及大中小各尺寸触控方案中发挥关键作用,通过检测电容变化来识别指纹特征或感知触控操作。

光谱技术平台:聚焦光电相关技术,涵盖高性能光电pixel设计,能精准感知光信号;光学镜头和微镜头设计,可优化光的传输与聚焦;光谱colorfilter设计,实现对不同光谱的筛选与处理。结合高精度ADC和高信噪比AFE、信号链,能将光信号高效转换为精准的电信号并进行处理,可用于光电类生理指标检测等场景。

MEMS技术平台:基于MEMS技术进行传感器开发,并借助先进工艺平台和高精度ADC、高信噪比AFE、信号链,保障传感器的高精度和稳定性。产品广泛应用于楼层高度检测、辅助定位、手机高度位置导航、智能手表/手环运动检测等领域。

算法和解决方案平台:针对不同传感器和应用场景开发高性能算法,如高性能、小面积指纹算法和心率算法等嵌入式指纹算法。还为各行业提供定制化的应用解决方案,将传感器数据与实际应用需求相结合,提升产品的实用性和功能性,满足多领域的应用需求。

通过“3高1低1优”战略(“3高”指高集成、高精度、高灵敏度;“1低”指低功耗;“1优”指开发优秀性能的算法和行业应用解决方案),兆易创新正在引领MEMS传感器技术创新,即采用微型化集成设计融合多维感知与数据处理,依托精密工艺与智能算法实现复杂环境下的稳定测量和高灵敏度;创新低功耗架构显著降低能耗,支撑移动终端长效监测;构建全链技术生态,通过预置算法、标准化校准与场景化方案加速产品落地。

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