【经验】如何用通用接口芯片CH372或CH375代替CH371? 修改硬件连接方式以及软件操作方式即可
CH372与CH371相比,数据缓冲区更大,传输速度更快,除此之外,CH372还支持USB产品制造商自定义厂商ID和产品ID。CH375包含了CH372的全部功能,所以本说明也适用CH375。由于CH372与CH371的部分引脚和功能不兼容,如果打算用CH372或者CH375代替CH371,那么需要修改硬件连接方式以及软件操作方式。本文是关于如何将CH372(或者CH375)用于原CH371演示板的说明。有些用户已经购买CH371+CH451的演示板(评估板),如果打算在该演示板上试用CH372或者CH375,那么可以外加一块CH375到CH371的转换板。
CH372(CH375)与CH371的主要区别
⑴、硬件连接①目前,CH372只提供SSOP20超小型贴片封装,CH375只提供SOP28贴片封装。②CH372只有一根地址线A0,占用两个I/O端口地址,不支持复用地址方式;而CH371支持直接地址方式和复用地址方式,占用16个I/O端口地址。③CH372的USB数据线D+和D-不需要串联电阻;而CH371需要串联电阻。④CH372支持5V或者3.3V电源电压,并且增加一个V3引脚,需要外接退耦电容,或者与VCC一起连接3.3V电源;而CH371只支持5V电源。⑤CH372不支持两线串行接口SCL/SDA,并且不支持主控方式(因为CH372/CH375需要外部发出设置USB模式命令后才能工作),如果需要使用主控方式,那么可以用CH341芯片的并口方式代替CH371的主控方式,操作速度更快,并且CH341支持两线串行接口SCL/SDA。⑥CH372不提供上电复位输出引脚,CH375提供上电复位输出和外部复位输入引脚。
⑵、软件操作 ①CH372采用命令口加数据口的I/O操作方式,任何操作都是先要发出命令给CH372,然后是有顺序的数据输入或者输出;而CH371是寄存器映射方式,不考虑顺序。②CH372的批量数据端点的缓冲区是64字节,速度可达300KB/S,并且具有缓冲区锁定功能,防止数据覆盖和重发;而CH371的缓冲区是8字节。③CH372提供给单片机的中断是低电平中断,直到单片机获取中断状态后才撤消中断请求;而CH371提供的中断是低电平脉冲中断,自动撤消中断。④CH372上电后默认是关闭USB功能,连接到计算机的USB端口是没有反应的,必须由单片机给其设置USB工作模式,才能启用USB功能;而CH371和CH341上电后默认是启用USB功能,连接到计算机的USB端口是有反应的。⑤CH372支持USB产品制造商自定义厂商ID和产品ID,可以在设置USB工作模式之前通知CH372修改,以便于区分各厂家的各种USB产品;而CH371不支持。⑥通过CH372的DLL一次最多可以读写4096个字节的数据,可以参考CH372评估板资料中的BULK\WIN目录下的C程序。⑦CH372支持外置固件方式,CH372对单片机的I/O读写有一定的时序要求。
CH372或CH375到CH371的转换板
转换板只是针对原CH371的演示板,原演示板的CH371是DIP28封装,而CH372和CH375是贴片封装,并且部分引脚不同,所以需要转换板才能在原CH371的演示板上试用CH375。由于CH375的USB设备方式的功能与CH372相同,所以可以在CH375试用后直接换成CH372,以降低硬件成本。转换板应该插入原CH371的DIP28插座。
另外,需要如下设置:
①演示板上的电阻R1和R2(串联于原CH371的USB数据线D+和D-的电阻)应该直接短路,或者替换成1Ω左右的电阻。
②演示板上的跳线J1(连接原CH371的CS引脚的跳线)应该断开,因为转换板上已经将CH375的CS引脚通过电阻RCS接地了。
③演示板上的电容C1和C2(原CH371的振荡电容),可以换成15 pF。
④演示板上的U3、L1、R3都用不到,可以去掉。
⑤完全使用CH372评估板的资料(网上可以下载压缩文件CH372EVT.ZIP)进行演示。例如,在连接计算机后,使用CH372(或CH375)的驱动程序及演示程序,将其中DEMO子目录下的MCU(或MCU-C51)下的CH375451.HEX文件通过编程器写入原演示板的单片机U4中,演示USB控制CH451;或将其中BULK子目录下的HEX文件写入U4,可以测试USB数据传输速度。
转换板的原理图
说明:
当用于原CH371的评估板时,转换板上的J1和J3应该断开,因为原CH371演示板使用复位地址方式,所以转换板上加了地址锁存器74LS373,为CH375提供地址线A0。
当用于其它CH371的电路中时,如果使用直接地址方式则应该去掉电阻R1,如果电路中能够提供正确的片选译码,则可以去掉电阻RCS。
电阻RTXD用于使CH375工作于并口方式,去掉RTXD后CH375将工作于串口方式。如果不是用于原CH371演示板,而是用作CH375的SOP28转DIP28,那么,可以去掉电阻R1、RTXD、RCS,并且连接J1和J3。
转换板的 PCB 图
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本文由奶爸工程师转载自沁恒,原文标题为:用CH372或CH375替换USB芯片CH371的说明,无单片机环境下的主控应用可以使用CH341代替CH371。,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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峰值最高波特率(Mbps)
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硬件流控
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MUC电压(V)
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省电双供电&IO防倒灌
|
MODEM信号(兼GPIO和其他接口)
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内置时钟
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温度范围(℃)
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封装
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内核
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CH343P
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USB转单串口芯片
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1
|
全速
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VCP/CDC
|
6Mbps
|
6Mbps
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√
|
√
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内置
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5V/3.3V/2.5V/1.8V
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5V/3.3V/2.5V/1.8V
|
√
|
RTS/CTS/DTR/DSR/DCD/RI
|
√
|
-40~+85℃
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QFN16
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第3代
|
选型表 - 沁恒 立即选型
【产品】 国产并行口扩展I/O芯片CH351,基于8位并行总线扩展32个GPIO
沁恒推出的CH351是PCI总线的双串口及打印口芯片,基于8位并行总线扩展32个GPIO,独立输入或者输出,支持中断,用于PCI转双串口、PCI转打印口(并口)。CH351芯片提供了通用的8位被动并行接口,可以方便地挂接到各种8/16/32位单片机、DSP、MCU的系统总线上。
沁恒(WCH)USB转串口芯片选型表
目录- USB转串口芯片
型号- CH344Q,CH340K,CH340N,CH340T,CH9101U,CH9101H,CH341B,CH341A,CH9103M,CH341F,CH343G,CH9143,CH343K,CH343P,CH347,CH9102X,CH9326,CH9340K,CH341T,CH9340C,CH9342G,CH9344L,CH340E,CH342F,CH348L,CH340C,CH340B,CH342K,CH348Q,CH344L,CH340G,CH9102F
多家知名品牌的共同选择,沁恒多领域应用拆解案例
沁恒在接口芯片和MCU领域深耕多年,产品线丰富,易于使用,性能卓越,覆盖USB/蓝牙/以太网接口芯片和32位/8位等多种MCU。沁恒拥有RISC-V架构的自研青稞内核,产品可持续竞争力更强。未来沁恒还将继续专注于连接技术和微处理器内核研究,致力为厂商带来更多高性能、高质量芯片产品,推动整体行业高速发展。
CH334U IC RoHS(SGS)检测报告(CANEC2304439901)
描述- 本报告为南京勤恒微电子有限公司提供的CH334U型号IC元器件的测试报告。报告编号为CANEC2304439901,测试日期为2023年3月27日至31日。测试内容包括欧盟RoHS指令(EU)2015/863规定的有害物质限量,如铅、汞、镉、六价铬、多溴联苯(PBBs)、多溴联苯醚(PBDEs)、邻苯二甲酸酯类等。所有测试项目均符合RoHS指令要求,测试结果为“通过”。
型号- CH32V103C6T6,CH32F103VCT6,CH32F205RBT6,CH32V103VBT6,CH370,CH251,CH372,CH132,CH374,CH252,CH376,CH375,CH378,CH32V107RCT6,CH32V208WBU6,CH32V403CBT6,CH32V003J4M6,CH32F103C6T6,CH382,CH384,CH32V305WBU6,CH237,CH358,CH32F107RCT6,CH236,CH357,CH32F103C8U6,CH238,CH359,CH32L103J4M6,CH32V103VCT6,CH590,CH350,CH471,CH592,CH591,CH231,CH352,CH351,CH472,CH593,CH233,CH354,CH232,CH353,CH235,CH356,CH234,CH355,CH248,CH247,CH368,CH249,CH32V107RBT6,CH32V203G6U6,CH482,CH360,CH481,CH242,CH484,CH241,CH483,CH244,CH365,CH486,CH122,CH243,CH364,CH246,CH367,CH245,CH366,CH457,CH578,CH3232,CH335,CH456,CH577,CH32V303VCT6,CH217,CH338,CH459,CH337,CH458,CH579,CH334U,CH339,CH32V003A4M6,CH32V405RBT6,CH570,CH330,CH451,CH572,CH450,CH571,CH332,CH453,CH574,CH331,CH452,CH573,CH213,CH334,CH455,CH576,CH454,CH575,CH226,CH347,CH225,CH228,CH227,CH348,CH32V403G6U6,CH32V407VCT6,CH32L103G6U6,CH581,CH341,CH462,CH583,CH340,CH582,CH32F208WBU6,CH343,CH464,CH221,CH342,CH463,CH224,CH345,CH344,CH465,CH314,CH556,CH313,CH555,CH316,CH558,CH315,CH557,CH318,CH317,CH438,CH559,CH319,CH32L103F4U6,CH32F103VBT6,CH552,CH32L103FBP6,CH551,CH312,CH554,CH311,CH432,CH553,CH446,CH567,CH445,CH448,CH569,CH447,CH568,CH449,CH32F207VCT6,CH440,CH561,CH321,CH442,CH563,CH441,CH562,CH323,CH444,CH565,CH322,CH443,CH564,CH413,CH534,CH412,CH533,CH536,CH538,CH537,CH539,CH32V103R8T6,CH9936,CH9937,CH32V203F8U6,CH32V403C6T6,CH530,CH32V203G8R6,CH411,CH532,CH410,CH531,CH424,CH545,CH423,CH544,CH547,CH546,CH549,CH548,CH32F103R8T6,CH32V403F8P6,CH32V407RCT6,CH541,CH32L103CBT6,CH540,CH422,CH543,CH421,CH542,CH633,CH632,CH635,CH32V003F4P6,CH634,CH516,CH637,CH636,CH639,CH638,CH32L103F4P6,CH32V307RCT6,CH32L103CBU6,CH631,CH32V203G8P6,CH523,CH522,CH643,CH525,CH524,CH527,CH526,CH529,CH528,CH32V203F6P6,CH521,CH642,CH520,CH641,CH32F107RBT6,CH32F203CBT6,CH32V105RBT6,CH32V103R6T6,CH32V403G8P6,CH622,CH621,CH32V003F4U6,CH32F103R6T6,CH32F105RCT6,CH32V403F6P6,CH32L103G8P6,CH32V105RCT6,CH32V403F8U6,CH32V403G8R6,CH32V303CBT6,DM7407,CH32L103F8U6,CH32V305FBP6,CH32L103F6P6,CH32V405FBP6,CH32L103G8R6,CH32V403K6T6,CH9415,CH9413,CH9414,CH9412,CH32F107VBT6,CH8572,CH8571,CH32F203C8T6,CH8570,CH9884,CH32V208RBT6,CH32L103C6T6,CH32V305RBT6,CH9516,CH9514,CH9515,CH9512,CH9513,CH9511,CH32V208GBU6,CH32L103F8P6,CH9882,CH32V203C8T6,CH9626,CH9627,CH9624,CH9625,CH9622,CH9623,CH32F105RBT6,CH9628,CH9629,CH32F203C8U6,CH32V203C8U6,CH9578,CH9576,CH9577,CH32V405WBU6,CH32V403C8T6,CH32F103RCT6,CH32V103RBT6,CH9100,CH9342,CH32F203C6T6,CH9341,CH9102,CH9344,CH9101,CH9343,CH9463,CH9340,CH9328,CH9327,CH9569,CH9329,CH9326,CH9565,CH9325,CH9445,CH9566,CH32V107VCT6,CH32L103C8T6,CH32V403C8U6,CH32F208RBT6,CH9331,CH9574,CH9330,CH9575,CH9573,CH32F203VCT6,CH9317,CH9318,CH9438,CH9435,CH9436,CH9315,CH9433,CH9434,CH32F107VCT6,CH32L103C8U6,CH32V103RCT6,CH9320,CH32V203C6T6,CH32V307VCT6,CH9426,CH32V107VBT6,CH32V403VCT6,CH9431,CH9552,CH9432,CH32V203F8P6,CH32V303RCT6,CH32L103K6T6,CH32F203K8T6,CH9144,CH32L103A4M6,CH9143,CH9145,CH9140,CH9142,CH9141,CH9126,CH32V407WCU6,CH32F105VCT6,CH32F203RCT6,CH9375,CH9374,CH9371,CH9370,CH9373,CH9130,CH9372,CH32V303RBT6,CH32F103RBT6,CH32V203K8T6,CH9122,CH9121,CH9120,CH32V307WCU6,CH9104,CH9346,CH9103,CH9345,CH32V403RCT6,CH32F203RBT6,CH9232,CH9110,CH9234,CH9230,CH9350,CH32V203RBT6,CH32V103C8T6,CH32V403K8T6,CH32L103K8T6,CH32F103C8T6,CH32V403RBT6,CH32V103C8U6,CH32V105VCT6,CH181,CH183,CH182,CH32V208CBU6,CH390,CH392,CH32V203K6T6,CH394,CH9165,CH396,CH395,CH32L103GBU6,CH398,CH397,CH9161,CH32F105VBT6,CH32V105VBT6,CH9397,CH9150,CH9153,CH9152
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可定制显示屏的尺寸0.96”~15.6”,分辨率80*160~3840*2160,TN/IPS视角,支持RGB、MCU、SPI、MIPI、LVDS、HDMI接口,配套定制玻璃、背光、FPCA/PCBA。
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深圳市启威测实验室,面向所有企业提供信号完整性测试服务,主要包括USB、HDMI 、DP、MIPI、PCIe 、SD/EMMC、DDR接口信号测试。测试手段有波形测试、眼图测试、抖动测试等。
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