【应用】沁恒USB转串口芯片CH340N用于消费类电子产品，采用SOP-8封装，无需外部晶振

时间： 2022-07-27 来源：世强

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南京沁恒微电子股份有限公司成立于2004年，是一家通讯接口芯片和全栈MCU芯片公司，其推出的USB转串口 CH340N可广泛应用于消费类产品中，实现将MCU串口信息通过USB打印到上位机终端。CH340N作为一款标准8脚贴片尺寸比较小，而且内部已集成时钟电路无需外部晶振，用户使用比较简单，完全满足普通用户的串口调试功能。

简单的应用框图如下图所示：

图1 应用框图

从应用框图可以看出CH340N的应用比较简单通过串口的TX和RX与MCU通信，对外通过USB与设备终端通信。其中规格书中也给出了一种可以实现连接MCU、各自供电、双向防灌的应用如下图所示：

图2 应用原理图

上述应用电路在常规的应用中增加了防倒灌功能，就是避免在CH340N或MCU一方不供电的情况下另一方通过信号线将电流灌入。其中MCU的RXD引脚要配置为内部上拉输入模式，如果MCU不支持则需要外部接一个上拉电阻，阻值大小推荐值：2KΩ~22KΩ。CH340N的IO都支持自动防内倒灌，即CH340N无电但MCU有电时不会产生倒灌电流。为了避免CH340N有电MCU无电对MCU外灌电流加上了如上图所示的D6、D7、Q5器件。

通过以上电路就可以CH340N和MCU双向防倒灌。其中二极管和MOS管的选型规格书都提供了推荐型号，二极管优先用小功率的Schottky肖特基二极管BAS70、BAT54，或B0520等；NMOS管优先用小功率、小电容的NMOS管2SK3018、1012等。

综上CH340N作为一款USB转串口的芯片在消费类电子上的应用可参考以下优势：

1、小尺寸，采用SOP-8的封装形式，去掉冗余设计尺寸更小。

2、成本低，国产芯片成本和货源可控性强。

3、电路简单，内置时钟，无需外部晶振外围电路器件少。

综上所述，沁恒推出的USB转串口CH340N非常适合广泛应用于消费类电子产品中。

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沁恒（WCH）通讯接口芯片和全栈MCU选型指南

目录- 企业简介接口转换产品 MCU产品选型 USB转串口产品选型低功耗蓝牙系列单片机系列网络系列 USB系列 USB PD协议系列/ Type-C快充系列 PCI/PCIE 系列显示驱动及键盘扫描系列单片机外围系列通讯接口芯片和全栈MCU芯片产品方案

型号- CH24X,CH36X,CH32V103C6T6,CH32F205RBT6,CH370,CH372,CH343G,CH374,CH132,CH32F203C8T6,CH252,CH376,CH343K,CH375,CH378,CH440G,CH583M,CH32V208WBU6,CH32V208RBT6,CH341T,CH32V003J4M6,CH32V203系列,CH32F103C6T6,CH32V305RBT6,CH382,CH342F,CH384,CH342K,CH221K,CH37X,CH9374B,CH237,CH236,CH58X,CH340K,CH32F103C8U6,CH22X,CH34X,NET-232-9120,CH582M,CH340N,CH340T,NET-SER-DT TTL,CH32V208GBU6,CH341B,CH341A,CH341F,CH32V203C8T6,CH231,CH486F,CH351,CH235,CH234,CH35X,CH247,CH368,CH484M,CH23X,CH32V307,CH32V203G6U6,CH582F,CH340E,CH482,CH32V305,CH481,CH32F203C8U6,CH340C,CH484,CH32V203C8U6,CH32V303,CH340B,CH241,CH483,CH365,CH486,CH364,CH340G,CH246,CH367,CH4XX,CH366,CH578,CH457,CH9339,CH577,CH32V303VCT6,CH335,CH456,CH9338,CH579,CH337,CH32V,CH56X,CH339,CH32V003A4M6,CH32F,BLE-TPT-A-ANT,CH32F203C6T6,BLE2U-A-ANT,CH565M,CH451,CH9102,CH9344,CH571,CH450,CH444G,CH9101,CH9343,CH453,CH573,CH452,CH334,CH455,CH9340,NET-TTL-9120,CH454,CH563Q,CH347,CH9328,CH226,CH57X,CH225,CH348,CH9329,CH9326,CH9342G,CH32F208RBT6,CH581,CH583,CH341,CH462,CH582,CH32F203VCT6,CH32F208WBU6,CH340,CH343,CH342,CH221,CH463,CH345,CH224,CH443K,CH344,CH556,CH344Q,CH555,CH558,CH557,CH559,CH317,CH438,CH54X,NET-485-9120,CH9434,CH319,CH224D,CH563L,CH442E,CH32V203C6T6,CH552,CH32V307VCT6,CH551,CH554,CH224K,CH432,CH567,CH343P,CH446,CH445,CH569,CH561Q,CH448,CH55X,CH568,CH440R,CH31X,CH449,CH440P,CH9340K,CH9340C,CH32F207VCT6,CH561,CH440,CH563,CH442,CH344L,CH565,CH444,CH443,CH32V203F8P6,CH412,BLE-TPT-B-ANT,CH32V303RCT6,CH52X,CH32V103R8T6,CH32V003系列,CH448F,CH32F203K8T6,CH32V203F8U6,NET-SER-DT RS232,CH9103M,CH9143,CH93XX,CH9145,CH9140,CH32V203G8R6,CH9142,CH532,CH9141,CH531,CH545,CH424,CH544,CH423,CH547,CH546,CH446Q,CH549,CH9126,CH446X,CH53X,CH548,CH32F103R8T6,BLE-DONGLE,CH32F203RCT6,NET-SER-DT RS485,CH9104L,CH541,CH540,CH543,CH422,CH32V003,CH542,CH421,CH32V003F4P6,CH9101Y,CH445P,CH32V303RBT6,CH9101N,CH9101R,CH9101U,CH9101H,CH32V307RCT6,CH32V203K8T6,CH9121,CH9120,CH32V307WCU6,CH32V303系列,CH347T,CH522,CH9102X,CH444P,CH525,CH524,CH9104,CH527,CH9103,CH528,CH565W,CH9344L,BLE-SER-A-ANT,CH348L,CH348Q,CH32V203F6P6,CH521,CH9350,CH32V203RBT6,CH9102F,CH483M,CH32F203CBT6,CH32V103C8T6,CH483X,CH91XX,CH581F,CH32F103C8T6,CH32F207,CH32F205,CH32F203,CH32V103C8U6,CH32V003F4U6,CH482X,CH32F208,CH181,CH32V208,CH182,CH32V103系列,CH32V203,BLE2U-C-ANT,CH32V208CBU6,CH914X,CH449X,CH32V303CBT6,CH32V305FBP6,CH390,CH392,CH32V203K6T6,CH482D,CH395,CH397,CH38X,CH569W,CH315S,BLE232-NEP,CH32F103,CH449F,CH32V103,CH39X,CH9150,CH481D

2022/12/06 - 沁恒 - 选型指南代理服务技术支持现货查询批量订货

沁恒（WCH）通讯接口芯片和全栈MCU选型指南

目录- 企业简介接口转换产品 MCU产品选型 USB转串口产品选型低功耗蓝牙系列单片机系列网络系列 USB系列 USB PD协议系列 PCI/PCIE 系列显示驱动及键盘扫描系列单片机外围系列产品方案

型号- CH32V103C6T6,CH32F205RBT6,CH343G,CH32F203C8T6,CH343K,CH573F,CH378,CH440G,CH571K,CH32V208WBU6,CH583M,CH32V208RBT6,CH341T,CH32F103C6T6,CH32V305RBT6,CH342F,CH384,CH342K,CH32F103C8U6,CH340K,CH582M,CH340N,CH340T,CH32V208GBU6,CH341B,CH341A,CH571F,CH341F,CH32V203C8T6,CH486F,CH571D,CH368,CH484M,CH32V307,CH582F,CH340E,CH482,CH32F203C8U6,CH32V305,CH481,CH32V203C8U6,CH340C,CH484,CH32V303,CH483,CH486,CH340G,CH246,CH578,CH457,CH32V303VCT6,CH577,CH335,CH456,CH552T,CH579,CH552P,CH577F,CH32F203C6T6,CH9344,CH451,CH450,CH444G,CH453,CH452,CH334,CH455,CH454,CH9328,CH348,CH9329,CH224P,CH9326,CH34B,CH9342G,CH32F208RBT6,CH581,CH583,CH341,CH462,CH32F203VCT6,CH32F208WBU6,CH582,CH340,CH552E,CH343,CH342,CH463,CH552G,CH345,CH224,CH443K,CH344,CH556,CH555,CH558,CH557,CH559,CH317,CH438,CH224D,CH32V203C6T6,CH442E,CH552,CH551,CH554,CH224K,CH551G,CH343P,CH567,CH446,CH445,CH569,CH448,CH568,CH440R,CH449,CH440P,CH573X,CH9340K,CH9340C,CH32F207VCT6,CH440,CH442,CH344L,CH565,CH444,CH443,CH32V303RCT6,CH32V103R8T6,CH448F,CH9103M,CH9143,CH557Q,CH9140,CH532,CH9142,CH545L,CH531,CH9141,CH545,CH544,CH423,CH547,CH546,CH549,CH548,CH32F103R8T6,CH32F203RCT6,CH541,CH540,CH543,CH422,CH542,CH554T,CH445P,CH554P,CH32V303RBT6,CH9101U,CH579F,CH9101H,CH32V307RCT6,CH32V203K8T6,CH555L,CH9121,CH9120,CH579M,CH522,CH9102X,CH525,CH444P,CH524,CH527,CH528,CH578F,CH554E,CH9344L,CH578M,CH348L,CH554G,CH348Q,CH521,CH9102F,CH9350,CH483M,CH32F203CBT6,CH32V103C8T6,CH483X,CH549L,CH549F,CH549G,CH581F,CH32F103C8T6,CH32F207,CH32F205,CH559T,CH32F203,CH32V103C8U8,CH482X,CH32F208,CH548G,CH32V208,CH548L,CH32V203,CH548N,CH32V208CBU6,CH558T,CH32V303CBT6,CH547G,CH392,CH547F,CH482D,CH395,CH559L,CH547L,CH397,CH32F103,CH546G,CH32V103,CH558L,CH546L,CH481D

2022/01 - 沁恒 - 选型指南代理服务技术支持现货查询批量订货

CH340 USB转串口芯片数据手册

型号- CH340K,CH340N,CH340E,CH340C,CH340,CH340B,CH340R

2021/12/17 - 沁恒 - 数据手册代理服务技术支持现货查询批量订货查看更多版本

CH34X USB-to-SERIAL MACOS DRIVER INSTALLATION INSTRUCTIONS

型号- CH34X,CH9103,CH9143,CH341,CH9102,CH340,CH9101,CH343,CH342,CH344

2021/11/11 - 沁恒 - 用户指南 - Version: V1.6 代理服务技术支持现货查询批量订货

USB 转串口芯片CH9102A手册

型号- CH9102A

2024/6/13 - 沁恒 - 数据手册 - 版本： 1 代理服务技术支持现货查询批量订货

CH9102 USB转串口芯片数据手册

型号- CH9102X,CH9102,CH9102F

2021/02/03 - 沁恒 - 数据手册代理服务技术支持现货查询批量订货

沁恒USB转单串口芯片选型表

沁恒USB转单串口芯片选型表提供USB高速/全速转串口系列芯片，可实现USB转1/2/4/8路串口，支持串口I/O独立供电，支持VCP/HID/CDC/AOA转串口，VCP串口支持硬件流控和高波特率大数据连续传输，部分型号支持VID/PID/String等内容配置，支持Windows/Linux/Android/macOS等操作系统。