Finding a Cheaper USB to Serial Chips. FTDI gate wasnt great for anybody, and now with hardware hobbyists and technological tinkerers moving away from the most popular USB to serial adapter, some other chip has to fill the void. The cheapest USB to serial chip on the market appears to be the CH3. G, available for 2. There is, however, almost no English documentation, and the datasheet for the CH3. Ians here to help you out. He got his mitts on a few of these chips and managed to figure out the pinout and a few reference schematics. He even made an Eagle part for you. Isnt that nice The CH3. USB device that emulates a standard serial interface, with speeds from 5. Mpbs. The chip supports 5. V and 3. 3. V, and all the weird modem lines are supported. This chip even has an Ir. DA mode, because wireless communication in the 9. With Ians help, we now have a cheap source of USB to serial chips. If you need the datasheet, here you go. The driver is a bit more difficult to find, but what youre looking for is the CH3. That can be found with a little bit of Google fu. A Serial Adapter White Paper. If you need to connect a serial device to your computer but your computer doesnt have a serial port, then you need a USB to Serial. Microchip Technology Inc. FlashIP solutions, providing lowrisk product development, lower total. Smally. Mouse. 2 Universal USB to Quadrature Mouse Adapter Waiting for Friday. Smally. Mouse. 2 is a universal USB to quadrature mouse adapter for many 8 bit and 1. USB mice on machines such as the Acorn BBC Micro, Acorn Master, Acorn Archimedes, Commodore Amiga, Atari ST and many more. Unlike most existing mouse adapters, Smally. Mouse. 2 implements a fully USB compatible interface most current adaptors are PS2 based this allows the use of any modern mouse including those that use wireless communications. The Smally. Mouse. Usb Serial Port Adapter Schematic HeavenSmally. Mouse. 2 provides a smaller PCB footprint compared to the original Smally. Mouse and, in addition, has quadrature output headers suitable for both the Acorn BBC Micro a 2. IDC and a 1. 0 pin SIL header suitable for custom made cables for retro computers. Smally. Mouse. 2 also supports the Atmel FLIP DFU bootloader pre programmed into the AVR chip by Atmel and can be flashed via USB allowing both initial programming and firmware upgrades without the need for Atmel programming hardware. Smally. Mouse. 2 also provides an expansion header with 8 GPIO pins. This allows general purpose IO as well as access to the I2. C and UART serial hardware of the AVR microcontroller. This header can provide the ability to add a serial debug console as well as other hardware such as status LEDs and additional configuration switches. Smally. Mouse. 2 has been tested with the following machines please see the cable pinout section below for details Acorn BBC Micro model BAcorn BBC Master Turbo. Acorn RISC PC 6. 00. Commodore Amiga A6. Atari 5. 20. STIf you have successfully tested Smally. Mouse. 2 with a computer that is not in the list above please leave a comment stating the exact model of computer and the firmware version either below, or as a Git. Hub issue for the present firmware release if this involves a pinout which is not provided below, please send a note of the pinout also if possible. Id=516184&typeImage=high&productGalleryId=20694284&fileName=1518_ICUSB232_4.jpeg' alt='Usb Serial Port Adapter Schematic Minecraft' title='Usb Serial Port Adapter Schematic Minecraft' />Usb Serial Port Adapter SchematicsHardware. Schematic. Smally. Mouse. 2 uses an AT9. USB1. 28. 7 microcontroller from Atmel that supports both USB device used for bootloader programming and host mode used for mouse support. Host mode support is required as a USB mouse is a device and therefore needs Smally. Mouse. 2 to act as the host computer. The schematic design for Smally. Mouse. 2 is available from Git. Hub in Ki. CAD format Smally. Mouse. 2 Schematic. For details of the various interfaces provided by the Smally. Mouse. 2 design please see the interfaces section below. PCB design. The PCB design can be seen in the following picture The Smally. Mouse. 2 PCBThe PCB is designed to be fabricated as a double sided PCB. Due to the tolerances of the traces and vias on the PCB it is recommended that the board is produced by a professional fabrication service. The required Gerber files for fabrication are included in the Git. Usb Serial Port Adapter Schematic' title='Usb Serial Port Adapter Schematic' />Hub project files. The PCB design also includes 4 mounting holes for M3 size screws or PCB stand offs. The USB port is extended over the edge of the PCB to facilitate mounting the board inside an enclosure. Media Player Codec Pack 11.0.2. All required components are mounted on the top copper surface of the board to provide compatibility with pick and place machines and to simplify hand population of the board. The following components are used by the PCB design Capacitors. F7x 0. 80. 5 1. 00n. F1x 0. 80. 5 1u. FResistors. R 12x 0. 80. 5 1. K 1ICs. 1x TQFP 6. Atmel AT9. 0USB1. Pin headers. 2x pin header straight 11. Connectors. 1x IDC header 21. Amphenol 8. 75. 83 2. BLF USB ACrystal. MHz crystal. Power consumption. When powering Smally. Mouse. 2 from the host computer attention should be given to the required amount of current consumed by both Smally. Mouse. 2 and the connected USB mouse. The USB specification generally limits the maximum USB device consumption to 1. A and this figure should be used as the normal consumption of USB mice in general. The Smally. Mouse. A to 6. 1m. A the power consumption varies depending on the activity levels of the mouse. A safe assumption is that the total required current supplied by the host should be 1. A in total for both the mouse and Smally. Mouse. 2. In addition, the following mice were physically tested power consumption includes the Smally. Mouse. 2 board Logitech Performance MX wireless mouse 8. AMicrosoft Comfort Mouse 6. AKensington Orbit Optical trackball wired mouse 1. AInterfaces. The Smally. Mouse. 2 hardware provides 5 interfaces USB, JTAG, BBC Micro user port AMX mouse, generic quadrature mouse 1. A development board fitted with all available interfaces is shown in the following picture please note that the JTAG header is only required for development and debug functionality and should not be fitted to general purpose boards Smally. Mouse. 2 with JTAGUSBThe USB interface can act in both USB host and USB device mode. When acting as a USB device i. Smally. Mouse. 2 will take power from the host device, so no other power supply should be used. When acting as a USB device it is recommended that all other interfaces are disconnected. In USB host mode Smally. Mouse. 2 can be connected to any USB 1. USB HID protocol. Note that the USB host mode support is only limited by the firmware the USB host interface can also be used to support other USB devices such as keyboards and non standard mice provided appropriate firmware support is added. Infant Nutrition Powerpoint Template there. The USB interface provides a female USB A type connector. For use as a USB device for example, when programming via the bootloader a USB A A style cable is required. In host mode the male USB A connector of the device plugs directly into the available connector. JTAGThe JTAG interface is used for direct programming of the AVR microcontroller and is useful for either development work where the USB bootloader is inconvenient or board recovery in the unlikely event that the USB bootloader is corrupted or unavailable. Since the JTAG header is optional it is not necessary for general use the interface is provided by 7 solder pads along the top edge of the PCB. To use the JTAG header you will need to solder an appropriate 21. BBC Micro User Port AMX MouseThe BBC Micro User Port interface is a 2. IDC connector 21. Acorn range of 8 bit computers BBC Micro Model A and B, BBC Master 1. This interface allows Smally. Mouse. 2 to be connected to the Acorn computer using a straight 2. IDC connectors. The pinout of the interface follows the AMX mouse standard and is compatible with all AMX software as well as the Acorn VFS implementation used in the BBC Domesday project. The interface also provides power to the Smally. Mouse. 2 board via the host machine, so no external power supply is required. This interface is optional and can be left unpopulated if Acorn user port support is not required. Smally. Mouse. 2 Acorn user port pinout. Generic quadrature mouse. The generic quadrature mouse interface is provided by a 1. SIL header. 4 pins are used for quadrature output to the retro computer, 3 pins are used for mouse button output and 3 pins are used for power input. Generic mouse header.