Misc Projects

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This is a list of breakout boards and smaller miscellaneous projects that have been created. All of the following designs are open-source, and all are welcome to modify and use these designs as they please.

MS5534 Breakout

This is a breakout board for the MS5534 digital pressure sensor. It includes the sensor itself, a 22uF Tantalum decoupling capacitor, and circuitry to generate a 32kHz reference clock for the chip's ADC and supporting circuitry.

Files: http://www.rev0proto.com/files/MiscProjects/ms5534_v10.zip Clock generation circuit is incorrect, new revision needs to be made.

XBee Pro XSC Breakout

This is a breakout board for the XBee Pro XSC 900MHz radio transceiver. It includes a 300mA 3.3V LDO for powering the device from USB, and all XBee pins are broken out to standard 0.1" headers. The design is similar to the Parallax XBee USB Adapter Board, though specialized for the XBee Pro XSC. Credit goes to Justin Jordan for the original schematic made in PCB Artist.

Files: http://www.rev0proto.com/files/MiscProjects/xbee_usb_breakout_v10.zip

MCP2200 Breakout

This is a breakout board for the MCP2200 USB-to-UART bridge IC. It includes the chip, a mini-B USB connector, and four status LEDs. The IC is provided a 12MHz SMD crystal on the underside of the board, and all pins are accessible on the header.

Files: http://www.rev0proto.com/files/MiscProjects/MCP2200_v11.zip

ADC-10-4 Directional Coupler Breakout

This is a breakout board for the ADC-10-4 directional coupler from Mini-Circuits. It includes the device and SMA connectors for all four ports of the device, as well as pads for soldering on a 50 ohm terminator for the terminated port.

The device's internal construction is of the type detailed on this page: http://michaelgellis.tripod.com/direct.html The schematic for the internal construction is shown below.

Testing was performed on the device using an Anritsu MS4622B vector network analyzer using the configurations shown below. The results are summarized in the two graphs below, which show that the device compares well to and exceeds the manufacturer specifications, with the exception of insertion loss, coupling at higher frequencies, and the CPL port return loss.

Board Files: http://www.rev0proto.com/files/MiscProjects/dircoupler_v10.zip

Test Data: http://www.rev0proto.com/files/MiscProjects/ADC-10-4.zip