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add doc "USB Module"
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# USB
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<!-- 中文 | [English](/en/product_documents/modules/module_stepmotor) | [日本語](ja/product_documents/modules/module_stepmotor) -->
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## 描述
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<mark>USB模块</mark>是一款USB控制器,内置了USB芯片MAX3421E。堆叠了M5Core之后,通过通信速率可高达26MHz的SPI接口与M5Core连接,即可作USB外设又可作USB主机。
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## 特性
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- 高达26MHz的SPI接口
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- 8路GPIO输入输出
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- 内置锂电池接口
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## 包含
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- 1x USB模块
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## 应用
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- USB键盘记录器
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- M5Core读写U盘
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## 相关链接
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<!-- - **[例程](https://github.com/m5stack/stepmotor_module/tree/master/StepMotor_M5test)** -->
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<!-- - **[Quick Start]()** -->
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- **[数据手册](https://www.sparkfun.com/datasheets/DevTools/Arduino/MAX3421E.pdf)** (MAX3421E)
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- **[原理图](https://github.com/m5stack/M5-Schematic/blob/master/Modules/USBHost.pdf)**
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- **[购买链接](https://www.aliexpress.com/store/product/M5Stack-New-USB-Module-USB-HOST-HID-with-MAX3421E-SPI-Interface-Output-5-Input-5-Compatible/3226069_32961627365.html?spm=a2g1y.12024536.productList_5885013.subject_1)**
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<figure>
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<img src="assets/img/product_pics/modules/usb_01.jpg" height="300" width="300">
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</figure>
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<figure>
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<img src="assets/img/product_pics/modules/usb_02.jpg" height="300" width="300">
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</figure>
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