看这个挺好
硬件上用了usb隔离 用了usb终端 emi 过滤 稳定性应该不会太差 想复刻个小的 把arduino 换成pic单片机 去掉键盘功能 用上位机控制 存储的呼叫内容 搜集了一些东西 时间合适就开搞
还是开源
坑我先挖好，我选了选器件 结果发现跟这个 open-interface 一样的方案了 所以就叫复刻吧
Linker Keyer Parts Selection
USB Hub TUSB4041I-Q1 Automotive Four-Port High-Speed 480Mbps USB 2.0 Hub
USB2UART Bridge CP2102/9 SINGLE-CHIP USB-TO-UART BRIDGE PS: Internal 24MHz Osc
FT232R
LTM1884 Isolated USB Transceiver with Isolated Power VERY high cost
ADUM3160 Full/Low Speed USB Digital Isolator
ADUM4160 Full/Low Speed 5 kV USB Digital Isolator
Keyer Controller PIC18(L)F2X/4XK22 28/40/44-Pin, Low-Power, High-Performance Microcontrollers with XLP Technology PS: XLP Tech Low Power Low EMI
High PSRR LDO LT3045 LT3045 - 20V, 500mA, Ultralow Noise, Ultrahigh PSRR RF Linear Regulator Ultra Low Noise, Ultra High PSRR, > 50dB @ 10MHz
LP38798 LP38798800-mAUltra-Low-Noise, High-PSRRLDO
EMI Filter Line Termination USBDFxxW5 EMI filter and line termination for USB downstream ports
STF202 EMI Filtering, USB Upstream Line Termination and ESD Protection
PACUSB−D1/D2 USB Downstream Port Terminator
Isolated Low Noise DC DC LTM8048 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator
还有一些usb 抗干扰设计技术文档
Docs
Intel EMI Design Guidelines for USB Components
http://www.ti.com/sc/docs/apps/msp/intrface/usb/emitest.pdfIntel High Speed USB Platform Design Guidelines
http://www.usb.org/developers/docs/hs_usb_pdg_r1_0.pdf NXP ESD protection for USB 2.0 interfaces AN10753
http://assets.nexperia.com/documents/application-note/AN10753.pdfDESIGN AND SIMULATION OF INTEGRATED EMI FILTER
http://www.scs-europe.net/dlib/2016/ecms2016acceptedpapers/0270-is_ECMS_0135.pdf USB Hardware Design Guide AN0046 - Application Note
https://www.silabs.com/documents/public/application-notes/AN0046.pdf[table=1363,#ffffff,,0][/table]
