鏃犵嚎鍙戝皠鑺墖 – 涓婃捣涓板疂鐢靛瓙淇℃伅绉戞妧鏈夐檺鍏徃缃戠珯 //huaanxuan.com 全球电子元器件授权代理方案分销?丰宝电子网上商城 Thu, 16 Nov 2023 08:05:03 +0000 zh-CN hourly 1 //wordpress.org/?v=6.5.5 //huaanxuan.com/wp-content/uploads/2022/12/logo-300px-32x32.png 鏃犵嚎鍙戝皠鑺墖 – 涓婃捣涓板疂鐢靛瓙淇℃伅绉戞妧鏈夐檺鍏徃缃戠珯 //huaanxuan.com 32 32 华普微CMT2119A在智能马桶动能开关中的应?/title> <link>//huaanxuan.com/cmt2119a-toilet-switch/</link> <comments>//huaanxuan.com/cmt2119a-toilet-switch/#respond</comments> <dc:creator><![CDATA[吴丽?Ameko Wu]]></dc:creator> <pubDate>Mon, 10 Jul 2023 05:00:00 +0000</pubDate> <category><![CDATA[产品线]]></category> <category><![CDATA[HOPERF]]></category> <category><![CDATA[方案]]></category> <category><![CDATA[消费电子]]></category> <category><![CDATA[无线发射芯片]]></category> <category><![CDATA[智能家居]]></category> <category><![CDATA[智能马桶]]></category> <guid isPermaLink="false">//huaanxuan.com/?p=19531</guid> <description><![CDATA[华普微的微能量收集无线发射芯片CMT2119A可用于自发电无线遥控设备,如智能马桶遥控器。该芯片具有可上位机软件配置参数、高次谐波余量充足、可软件设置不同频率等特点。自发电无线遥控设备可免布线、免电池、防触电、安全级别高,适用于智能家居中的多种遥控场景。]]></description> <content:encoded><![CDATA[<div date-time="1734850318" dir="ufacwk" style="height:50px" aria-hidden="true" class="wp-block-spacer"></div><h2 class="wp-block-heading">一?背景概述</h2><div date-time="1734850318" dir="yusjbt" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><p>党的二十大报告指出,要积极稳妥推进碳达峰碳中和。国务院印发?030年前碳达峰行动方案》,把节能减排作为推进碳达峰碳中和工作的重大举措;多省市已发布了碳中和奖励、补贴政策?/p><div date-time="1734850318" dir="sfqgcy" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><div date-time="1734850318" dir="ztombk" class="wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex"><div date-time="1734850318" dir="tpceug" class="wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow"><figure class="wp-block-image aligncenter size-full"><img fetchpriority="high" decoding="async" width="375" height="234" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-1_副本.jpg" alt="" class="wp-image-19532"/></figure></div> <div date-time="1734850318" dir="qrrfpc" class="wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow"><figure class="wp-block-image aligncenter size-full"><img decoding="async" width="467" height="295" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-2_副本.png" alt="" class="wp-image-19533"/></figure></div></div><div date-time="1734850318" dir="kwxxkq" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><p>自发电无线遥控设备(开?遥控器)是一种不需用电池或市电能源的无线发射设备,降低了电池污染和减少了布线,便于打造绿色简洁的智能家居系统,助力节能减排?/p><div date-time="1734850318" dir="ndfgjn" style="height:100px" aria-hidden="true" class="wp-block-spacer"></div><h2 class="wp-block-heading">二?应用案例与电路框?/h2><div date-time="1734850318" dir="msktmt" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><p>针对于自发电无线遥控设备,华普微推出了微能量收集无线发射芯片CMT2119A、CMT215x和CMT218x等系列,搭配接收芯片CMT221x系列一起使用,该无线发射芯片比较适于开?按键较少的应用场合?br>在智能马桶简易型自发电遥控器(动能开关)上选用了CMT2119A;全功能遥控器的功能按键多、用电池供电,选用CMT2119B;接收端一个接收需对二个发射,可选用CMT2219B解调遥控信号输出给主控板,如下图?/p><div date-time="1734850318" dir="ehdqjh" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><figure class="wp-block-image aligncenter size-large is-resized"><img decoding="async" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-3_副本_upscayl_4x_realesrgan-x4plus-1024x872.png" alt="" class="wp-image-19534" width="512" height="436" srcset="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-3_副本_upscayl_4x_realesrgan-x4plus-1024x872.png 1024w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-3_副本_upscayl_4x_realesrgan-x4plus-600x511.png 600w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-3_副本_upscayl_4x_realesrgan-x4plus-768x654.png 768w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-3_副本_upscayl_4x_realesrgan-x4plus-1536x1308.png 1536w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-3_副本_upscayl_4x_realesrgan-x4plus-2048x1744.png 2048w" sizes="(max-width: 512px) 100vw, 512px" /></figure><div date-time="1734850318" dir="htzlsk" style="height:50px" aria-hidden="true" class="wp-block-spacer"></div><p>简易型遥控器收发端的框图如下:</p><div date-time="1734850318" dir="bmqovf" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><figure class="wp-block-image aligncenter size-large is-resized"><img loading="lazy" decoding="async" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-4_upscayl_4x_realesrgan-x4plus-1024x510.png" alt="" class="wp-image-19535" width="768" height="383" srcset="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-4_upscayl_4x_realesrgan-x4plus-1024x510.png 1024w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-4_upscayl_4x_realesrgan-x4plus-600x299.png 600w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-4_upscayl_4x_realesrgan-x4plus-768x383.png 768w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-4_upscayl_4x_realesrgan-x4plus-1536x765.png 1536w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-4_upscayl_4x_realesrgan-x4plus-2048x1020.png 2048w" sizes="(max-width: 768px) 100vw, 768px" /></figure><div date-time="1734850318" dir="bcixzy" style="height:50px" aria-hidden="true" class="wp-block-spacer"></div><p>微能量收集无线发射芯片CMT2119A的主要特点:</p><div date-time="1734850318" dir="fmgosc" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><ul><li>可上位机软件配置参数,操作简单且人性化,节省MCU配置时间</li> <li>高次谐波余量充足,轻松通过欧美各种安规认证</li> <li>可软件设置不同频率,无需更换晶体,外围原件少</li> <li>频率范围?40~480 | 240?60MHz,穿墙能力强</li> <li>调制模式?G)FSK | OOK?G)FSK</li> <li>速率?.5?0Kbps(OOK)/0.5?00Kbps(FSK)</li> <li>输出功率?10?13dBm,支持软件设?/li> <li>低电压:1.8?.6V</li> <li>工作电流?5.5mA (+10dBm?0% duty cycle\9.6Kbps)</li> <li>小封装:SOT23-6</li></ul><div date-time="1734850318" dir="vxfyah" style="height:50px" aria-hidden="true" class="wp-block-spacer"></div><p>CMT2119A的应用电路如下:</p><div date-time="1734850318" dir="zunqpq" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><figure class="wp-block-image aligncenter size-large is-resized"><img loading="lazy" decoding="async" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-5_upscayl_4x_realesrgan-x4plus-1024x262.png" alt="" class="wp-image-19536" width="768" height="197" srcset="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-5_upscayl_4x_realesrgan-x4plus-1024x262.png 1024w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-5_upscayl_4x_realesrgan-x4plus-600x153.png 600w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-5_upscayl_4x_realesrgan-x4plus-768x196.png 768w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-5_upscayl_4x_realesrgan-x4plus-1536x393.png 1536w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-5_upscayl_4x_realesrgan-x4plus-2048x523.png 2048w" sizes="(max-width: 768px) 100vw, 768px" /></figure><div date-time="1734850318" dir="rbkuew" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><p>在智能马桶的应用中,针对于主控板、加热控制板和翻盖齿轮箱,我们还可以提供MCU、电源、过温保护、霍尔传感器、MOS管、继电器、马达驱动、蜂鸣器、语音芯片、光耦、电位器等产品?/p><div date-time="1734850318" dir="xywfrj" style="height:100px" aria-hidden="true" class="wp-block-spacer"></div><h2 class="wp-block-heading">三?工作原理与优?/h2><div date-time="1734850318" dir="khiflw" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><p>自发电无线遥控设备,是将手按开关或按键产生的微量动能、通过能量采集模组转化为电能供给控制器工作,再把控制信号通过无线射频发射出去控制其他设备工作。能量采集转换模组目前主要有微型发电机(闭合导线去切割磁感线)和压电生电2种方式(如下图)。前者产生的电量较多、成本高,做成的自发电遥控开关也较贵,后者产生的电量较少、很便宜,硬件结构和软件设计需更多考量?/p><div date-time="1734850318" dir="atbxqv" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><div date-time="1734850318" dir="edliob" class="wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex"><div date-time="1734850318" dir="skmsgx" class="wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow" style="flex-basis:66.66%"><figure class="wp-block-image aligncenter size-full"><img loading="lazy" decoding="async" width="362" height="142" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-6_副本.png" alt="" class="wp-image-19537"/></figure> <figure class="wp-block-image aligncenter size-full"><img loading="lazy" decoding="async" width="742" height="372" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-8_副本.png" alt="" class="wp-image-19539" srcset="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-8_副本.png 742w, //huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-8_副本-600x301.png 600w" sizes="(max-width: 742px) 100vw, 742px" /></figure></div> <div date-time="1734850318" dir="nkijrt" class="wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow" style="flex-basis:33.33%"><figure class="wp-block-image aligncenter size-full"><img loading="lazy" decoding="async" width="118" height="168" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-7_副本.png" alt="" class="wp-image-19538"/></figure> <figure class="wp-block-image aligncenter size-full"><img loading="lazy" decoding="async" width="150" height="163" src="//huaanxuan.com/wp-content/uploads/2023/07/CMT2119A-9_副本.png" alt="" class="wp-image-19540"/></figure></div></div><div date-time="1734850318" dir="gqfvot" style="height:50px" aria-hidden="true" class="wp-block-spacer"></div><p>用这种方式做成的无线遥控器尤其是遥控开关,在智能家居中的优势明显:</p><ol><li>免布线,免凿墙,易安装,节省材料人工成本?/li> <li>无需电池,节能环保;</li> <li>不需固定位置,在信号范围内自由放置或贴装?/li> <li>无源供电,防触电,安全级别高?/li></ol><div date-time="1734850318" dir="zujqpw" style="height:100px" aria-hidden="true" class="wp-block-spacer"></div><h2 class="wp-block-heading">四?更多应用场景</h2><div date-time="1734850318" dir="ptlppb" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><p>除了智能马桶遥控器,以下应用场景的遥控都可采用自发电遥控方式,接入网关后,可以拓展更多的智能家居使用场景?/p><div date-time="1734850318" dir="kojvng" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><ul><li>无线灯光照明</li> <li>无线门铃</li> <li>遥控卷帘门窗</li> <li>遥控风扇</li> <li>智能插座?/li></ul><div date-time="1734850318" dir="xsalra" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><p>基于智能家居的无线应用,我们可以提供电源、传感器、MCU、无线芯片、SOC等器件以及配套的解决方案?/p><div date-time="1734850318" dir="oqbhra" style="height:100px" aria-hidden="true" class="wp-block-spacer"></div><h2 class="wp-block-heading">五?丰宝简?/h2><div date-time="1734850318" dir="pjpsju" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div><div date-time="1734850318" dir="sbvqcm" class="wp-block-columns is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex"><div date-time="1734850318" dir="myugzc" class="wp-block-column is-layout-flow wp-block-column-is-layout-flow" style="flex-basis:66.66%"><p>上海丰宝电子信息科技有限公司创办?998?月,本土知名的元器件代理商。总部位于上海,在北京、深圳、苏州、香港、台湾设有分公司,并在广州、东莞、厦门、南京、杭州?武汉、西安等15个城市设有办事处。公司主营电子元器件世界品牌在中国大陆的代理销售,并致力于代理芯片产品的应用设计开发,整体解决方案在通讯、家电、工业控制得到广泛应用。公司的主要代理品牌有Bourns、Winbond、Omron、Knowles、U-blox 、Nuvoton、Digi和Torex等?/p> <p>丰宝电子系上海市高新技术企业,2003?014年连续十二年被《国际电子商情》评选为“读者最满意的十家大陆电子元器件分销商”。在2008?011年三次获得“Omron优秀代理商销售奖”,2009?012年三次获得“SGMC杰出成长奖”,2010年荣获“Bourns杰出业绩奖”,2011年荣获“NXP年度增长最快ID奖”,2012年荣获“NXP最佳FAE支持团队奖”,2013荣获 Torex合作伙伴奖。丰宝电子视诚信经营为企业至高荣誉,一直致力于上海市“诚信创建企业”工作认定,截止?017年已荣升为五星级企业?/p> <p> </p></div> <div date-time="1734850318" dir="kkcyyv" class="wp-block-column is-layout-flow wp-block-column-is-layout-flow" style="flex-basis:33.33%"><figure class="wp-block-image size-large is-resized"><img loading="lazy" decoding="async" width="691" height="1024" src="//huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-691x1024.jpg" alt="" class="wp-image-8055" srcset="//huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-691x1024.jpg 691w, //huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-scaled-600x889.jpg 600w, //huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-405x600.jpg 405w, //huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-768x1138.jpg 768w, //huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-1037x1536.jpg 1037w, //huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-1382x2048.jpg 1382w, //huaanxuan.com/wp-content/uploads/2023/01/IMG_20220729_152445-scaled.jpg 1728w" sizes="(max-width: 691px) 100vw, 691px" /><figcaption class="wp-element-caption">上海丰宝总部</figcaption></figure> <p></p> <p></p> <p></p> <p></p></div></div><div date-time="1734850318" dir="tncicy" style="height:100px" aria-hidden="true" class="wp-block-spacer"></div><h2 class="wp-block-heading">六?华普微简?/h2><div date-time="1734850318" dir="uhclzg" style="height:30px" aria-hidden="true" class="wp-block-spacer"></div> <section class="section" id="section_489341817"> <div date-time="1734850318" dir="msfpdl" class="section-bg fill" > </div> <div date-time="1734850318" dir="lgpnzs" class="section-content relative"> <div date-time="1734850318" dir="ghrzxg" class="row align-middle" id="row-1247347974"> <div date-time="1734850318" dir="xqltyv" id="col-1840183372" class="col medium-12 small-12 large-6" > <div date-time="1734850318" dir="rjzwwv" class="col-inner" > <div date-time="1734850318" dir="kbynuh" id="text-528961251" class="text"> <h1 class="uppercase">HOPERF</h1> <p><span style="font-size: 100%;">网址?a class="brandsl" href="//www.hoperf.cn/about/index.html" target="_blank" rel="noopener">//www.hoperf.cn/about/index.html</a></span></p> <p><span style="font-size: 100%;">国家:中?/span></p> <style> #text-528961251 { font-size: 1.75rem; line-height: 1.5; color: rgb(255,255,255); } #text-528961251 > * { color: rgb(255,255,255); } @media (min-width:550px) { #text-528961251 { font-size: 1.5rem; } } </style> </div> <div date-time="1734850318" dir="wuhrnr" id="gap-1179665099" class="gap-element clearfix" style="display:block; height:auto;"> <style> #gap-1179665099 { padding-top: 30px; } </style> </div> <div date-time="1734850318" dir="gfokbu" id="text-655921094" class="text"> <div>深圳市华普微电子股份有限公司(以下简称“华普微?是一家专注于无线射频和传感器领域的国家级高新技术企业。现已发展成为国内集ASIC芯片设计、MEMS传感芯片设计、封装测试校准技术、应用服务于一体的完整产业链公司。在户外运动、电子导航、工业测量、环境监测、医疗健康、安防监控、智能家居、数据采集等领域均得到日益广泛的应用;坚持自主研发,提供用于商业、消费和工业应用的射频芯片、传感器等产?amp;服务,积极推动中国集成电路产业逐步自主可控的国产化步伐?/div> <div></div> <style> #text-655921094 { font-size: 1rem; color: rgb(255,255,255); } #text-655921094 > * { color: rgb(255,255,255); } </style> </div> <div date-time="1734850318" dir="hujvnj" id="gap-1909386130" class="gap-element clearfix" style="display:block; height:auto;"> <style> #gap-1909386130 { padding-top: 10px; } </style> </div> </div> </div> <div date-time="1734850318" dir="vstjxt" id="col-1241961234" class="col medium-12 small-12 large-6 medium-col-first" > <div date-time="1734850318" dir="mpktcy" class="col-inner text-center" > <div date-time="1734850318" dir="tsnkcd" class="img has-hover x md-x lg-x y md-y lg-y" id="image_304835884"> <div date-time="1734850318" dir="ygdtnt" data-parallax-fade="true" data-parallax="2"> <div date-time="1734850318" dir="hhheob" data-animate="bounceIn"> <div date-time="1734850318" dir="mpnpsc" class="img-inner image-zoom box-shadow-3 box-shadow-2-hover dark" style="margin:1px 1px 1px 1px;"> <img loading="lazy" decoding="async" width="290" height="130" src="//huaanxuan.com/wp-content/uploads/2022/12/172_HOPERF.png" class="attachment-original size-original" alt="" srcset="//huaanxuan.com/wp-content/uploads/2022/12/172_HOPERF.png 290w, //huaanxuan.com/wp-content/uploads/2022/12/172_HOPERF-150x67.png 150w" sizes="(max-width: 290px) 100vw, 290px" /> </div> </div> </div> <style> #image_304835884 { width: 100%; } @media (min-width:850px) { #image_304835884 { width: 60%; } } </style> </div> </div> </div> </div> <div date-time="1734850318" dir="nmxoex" class="row row-small align-equal align-center" id="row-1003099954"> <div date-time="1734850318" dir="hmcqqj" id="col-577315527" class="col medium-8 small-12 large-4" > <div date-time="1734850318" dir="hxrgwh" class="col-inner" > <div date-time="1734850318" dir="gbfacq" class="is-border" style="border-radius:15px;border-width:1px 1px 1px 1px;"> </div> <div date-time="1734850318" dir="liajhn" class="icon-box featured-box icon-box-left text-left" > <div date-time="1734850318" dir="keakwp" class="icon-box-text last-reset"> <h3>产品线详细信?/h3> </div> </div> <div date-time="1734850318" dir="gkcfma" id="gap-76421871" class="gap-element clearfix" style="display:block; height:auto;"> <style> #gap-76421871 { padding-top: 15px; } </style> </div> <p>中文名称:华普微</p> <p>产品分类:无线射?/p> <p>经营模式:代?/p> </div> <style> #col-577315527 > .col-inner { border-radius: 15px; } </style> </div> <div date-time="1734850318" dir="qqqyxq" id="col-1809688204" class="col medium-8 small-12 large-4" > <div date-time="1734850318" dir="jgsgjq" class="col-inner" > <div date-time="1734850318" dir="xnjgdw" class="is-border" style="border-radius:15px;border-width:1px 1px 1px 1px;"> </div> <div date-time="1734850318" dir="xxfpfl" class="icon-box featured-box icon-box-left text-left" > <div date-time="1734850318" dir="jwbbam" class="icon-box-text last-reset"> <h3>应用领域及市?/h3> </div> </div> <div date-time="1734850318" dir="fapejm" id="gap-2094641721" class="gap-element clearfix" style="display:block; height:auto;"> <style> #gap-2094641721 { padding-top: 15px; } </style> </div> <p><a href="/industry-solutions_smart-home-list-page/">智能家居</a>,电竞,安防监控等?/p> </div> <style> #col-1809688204 > .col-inner { border-radius: 15px; } </style> </div> <div date-time="1734850318" dir="zmlkzb" id="col-1917762700" class="col medium-8 small-12 large-4" > <div date-time="1734850318" dir="uevjnj" class="col-inner" > <div date-time="1734850318" dir="fzhfio" class="is-border" style="border-radius:15px;border-width:1px 1px 1px 1px;"> </div> <div date-time="1734850318" dir="vbkepa" class="icon-box featured-box icon-box-left text-left" > <div date-time="1734850318" dir="phfgai" class="icon-box-text last-reset"> <h3>主要产品</h3> </div> </div> <div date-time="1734850318" dir="bsdxgq" id="gap-501653102" class="gap-element clearfix" style="display:block; height:auto;"> <style> #gap-501653102 { padding-top: 15px; } </style> </div> <p>无线射频和传感器?/p> </div> <style> #col-1917762700 > .col-inner { border-radius: 15px; } </style> </div> <style> #row-1003099954 > .col > .col-inner { padding: 25px 25px 25px 25px; background-color: rgb(255,255,255); } </style> </div> </div> <style> #section_489341817 { padding-top: 20px; padding-bottom: 20px; background-color: #446084; } @media (min-width:550px) { #section_489341817 { padding-top: 50px; padding-bottom: 50px; } } @media (min-width:850px) { #section_489341817 { padding-top: 70px; padding-bottom: 70px; } } </style> </section> <figure class="wp-block-image aligncenter size-full"><img loading="lazy" decoding="async" 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