暗物质是透明的吗？暗物质有没有质量？暗物质有没有活性
关于暗物质的特性，现代天体物理学基于大量观测证据已形成基本共识。以下是针对您三个核心问题的清晰解答：
科技新闻
人民日报对话任正非：自主创新+基础研究+人才耐心，市场驱动创新，竞争倒逼进步，法治保障公平，开放赢得未来。
市场驱动创新，竞争倒逼进步，法治保障公平，开放赢得未来。“自主创新+基础研究+人才耐心”三位一体，体现科技突围的底层逻辑与国家制度优势的结合。
小米与Arm携手开启新时代：XRING O1芯片正式发布
十五年技术积淀，Arm架构持续赋能自15年前创立以来，小米已从智能手机先驱成长为涵盖消费电子、IoT生态及智能出行的全球科技领导者。在这段征程中，Arm始终是小米的核心技术伙伴——从2011年首款小米手机到如今的全场景智能设备。今天，随着首款自研芯片XRING O1的诞生，双方合作迈入全新阶段。
Rafavi 便携式导航信号模拟、采集、回放及测试设备
便携式导航信号采集及测试设备 可以完成30MHz~3.6GHz模拟信号的采集和存储回放，可以模拟仿真BDS、GPS、GLONASS和GALILEO多频点干扰信号和欺诈信号，主要用于GNSS 设备与应用测试、汽车自动驾驶测试、导航干扰测试、导航欺诈测试等领域。
便携式导航信号采集及测试设备
便携式导航信号采集及测试设备 可以完成30MHz~3.6GHz模拟信号的采集和存储回放，可以模拟仿真BDS、GPS、GLONASS和GALILEO多频点干扰信号和欺诈信号，主要用于GNSS 设备与应用测试、汽车自动驾驶测试、导航干扰测试、导航欺诈测试等领域。
Bowers & Wilkins Pi7 S2 TWS bluetooth earbuds
High-resolution sound and crystal-clear voice calls, an industry-first wireless audio retransmission case.
国产芯片
UWB+GNSS Indoor and outdoor integrated positioning module
CM52 series products are UWB+GNSS indoor and outdoor integrated positioning module solutions...
商界市场
新香港展望
香港在资本市场中的三个新角色：1.作为中国概念股重新上市的地点； 2.作为国外资本参与中国发展的中介； 3.在中美加密货币对抗中的特殊地位。
蓝牙直连卫星物联网优势
低延迟、范围广、可靠性高、智能化强、改造快、成本少、功耗低、生态好
破解中美关税困局：为何合作而非对抗才是盈利关键
中美关税战已升级至前所未有的程度，电子产品、能源产品和工业材料等关键商品的关税税率飙升至100%以上。尽管头条新闻聚焦于政治博弈，但真正的机遇隐藏在那些愿意适应的美国企业的隐秘机会中。以下阐释为何与战略伙伴（如我们）合作能将此次危机转化为您的竞争优势。
便携式导航信号采集及测试设备
便携式导航信号采集及测试设备 可以完成30MHz~3.6GHz模拟信号的采集和存储回放，可以模拟仿真BDS、GPS、GLONASS和GALILEO多频点干扰信号和欺诈信号，主要用于GNSS 设备与应用测试、汽车自动驾驶测试、导航干扰测试、导航欺诈测试等领域。
专业收音降噪直播麦克风
专业收音降噪直播麦克风 (抖音/直播/短视频/录音专用)
Rafavi 蓝牙耳塞 R10
.短视频控制器 智能体验可支持短视频app点赞、上下翻页、音量加减。 .可自定义照片屏保支持手机本地相册图片 .智能一拖二耳机支持同时连接手机和充电仓，随心切换本地音乐和手机音乐
rafavi AI 智能舌相仪
集成AI人工智能，一分钟快速辨体质。
概述
The OM6621Dx is a power-optimized true system-on-chip (SOC) solution for both Bluetooth low energy and proprietary 2.4-GHz applications. It integrates a high performance and low power RF transceiver with Bluetooth base band and rich peripheral IO extension.OM6621Dx also integrates a power management to provide high-efficient power management. It targets 2.4-GHz Bluetooth low energy systems, proprietary
2.4-GHz systems,Human-Interface Devices (keyboard, mouse, and remote control),sports and leisure equipment, mobile phone accessories and consumer electronics.
OM6621Dx on-chip Bluetooth system compliant with version 5.0.
The chip integrates up to 64MHz high-performance MCU, DMA, GPIO, SPI, UART,TIMER, watch dog, supports 32MHz external crystal, integrates multi-purpose 10bit ADC.
The OM6621Dx integrates on chip 24KB ROM, 24K SRAM, 16K OTP and supports user defined IDE system on chip SFLASH MCU development and JTAG software upgrade.
2.4-GHz systems,Human-Interface Devices (keyboard, mouse, and remote control),sports and leisure equipment, mobile phone accessories and consumer electronics.
OM6621Dx on-chip Bluetooth system compliant with version 5.0.
The chip integrates up to 64MHz high-performance MCU, DMA, GPIO, SPI, UART,TIMER, watch dog, supports 32MHz external crystal, integrates multi-purpose 10bit ADC.
The OM6621Dx integrates on chip 24KB ROM, 24K SRAM, 16K OTP and supports user defined IDE system on chip SFLASH MCU development and JTAG software upgrade.
特性
RF transceiver
• -95dBm at 1Mbps sensitivity Bluetooth® low energy
• TX Power -20 to +10dBm
• 14.1mA peak RX, 12.8mA peak TX (0dBm)
CPU
• ARM® Cortex™-M4, max 64MHz
• Serial Wire Debug (SWD)
Memory
• 16KB OTP
• 24KB SRAM
• 24KB ROM
• Serial Flash
• QFN20:2Mb
• QFN32:4Mb
• Icache RAM 2KB
Clocks
• 32MHz crystal, 32MHz RC, 32.768KHz RC
Link Controller
• BT 5.0 LE PHY, link controller
• Proprietary 2.4-GHz link controller
Power Management
O M 6621D x B luetooth Low E nergy A pplication
• Deep sleep power 2.5uA
• Supply voltage range 1.8V~3.6V
• Integrated Charger(100mA/200mA)
Software
• compliant with BLE version 5.0
• Supports mesh network
• Network processor interface for applications running on an external micro
controller
• Sample applications and profiles
• Supports 6LowPAN
• Supports OTA
• SWD interface
Peripherals
• DMA x 4
• UART x 1
• Flexible general-purpose I/O GPIO 19GPIO(max)
• SPI master or slave interface x 1
• PWM x 6
• Watchdog to prevent system dead lock
• 32bit timer x 3
• single-end 10bits GPADC x 4
• AES HE encryption
Package
• OM6621DB: 20-pin 3x3mm QFN20
• OM6621DQ: 32-pin 4x4mm QFN32
• -95dBm at 1Mbps sensitivity Bluetooth® low energy
• TX Power -20 to +10dBm
• 14.1mA peak RX, 12.8mA peak TX (0dBm)
CPU
• ARM® Cortex™-M4, max 64MHz
• Serial Wire Debug (SWD)
Memory
• 16KB OTP
• 24KB SRAM
• 24KB ROM
• Serial Flash
• QFN20:2Mb
• QFN32:4Mb
• Icache RAM 2KB
Clocks
• 32MHz crystal, 32MHz RC, 32.768KHz RC
Link Controller
• BT 5.0 LE PHY, link controller
• Proprietary 2.4-GHz link controller
Power Management
O M 6621D x B luetooth Low E nergy A pplication
• Deep sleep power 2.5uA
• Supply voltage range 1.8V~3.6V
• Integrated Charger(100mA/200mA)
Software
• compliant with BLE version 5.0
• Supports mesh network
• Network processor interface for applications running on an external micro
controller
• Sample applications and profiles
• Supports 6LowPAN
• Supports OTA
• SWD interface
Peripherals
• DMA x 4
• UART x 1
• Flexible general-purpose I/O GPIO 19GPIO(max)
• SPI master or slave interface x 1
• PWM x 6
• Watchdog to prevent system dead lock
• 32bit timer x 3
• single-end 10bits GPADC x 4
• AES HE encryption
Package
• OM6621DB: 20-pin 3x3mm QFN20
• OM6621DQ: 32-pin 4x4mm QFN32
特性
LE 1M PHY
方框图
__应用说明
Products are applied in the fields of smart phones, feature phones, tablets, personal computers, wireless mouses, keyboards and smart home products, etc.
开发板
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