This version (04 Mar 2021 17:43) was approved by Juan Chong, Chas Frick.The Previously approved version (03 Jan 2021 22:04) is available.Diff

EVAL-ADIS-FX3 and FX3Api Developer Resources

EVAL-ADIS-FX3 Hardware Documentation

The EVAL-ADIS-FX3 hardware is completely open-source and MIT licensed. It includes many improvements learned from the previous generations of evaluation systems and is designed to be small, flexible, reliable, and low-cost. Some of the board’s features include:

  • A dedicated, onboard 3.3V, 2A linear regulator designed for high-transient applications
  • A USB-C connector (USB 2.0 compliant only)
  • An onboard, field-upgradable EEPROM with USB bootloader fallback
  • A software-selectable OFF / 3.3V / 5V IMU supply output with overcurrent and short-circuit protection
  • A JST-XH-2 external supply connector
  • USB and external supply selection jumper
  • Onboard status LEDs for indicating the active supply voltage, data transmission, and the IMU GPIO state
  • An iSensor standard, 16-pin, 2mm connector for compatibility with existing iSensor breakout boards and adapters
  • An additional 10-pin, 2mm connector for feature expansion.

The EVAL-ADIS-FX3 firmware was also redesigned to offer developers the flexibility to interface with as many external devices as possible. The firmware includes support for:

  • FX3 UART debugging
  • Four additional GPIO pins, separate from the four IMU GPIO pins), for external test equipment triggering and sensing (such as with a vibration stage or motors)
  • A separate 3.3V supply that powers the FX3 core and other, external level shifters, line drivers, etc.
  • An extra, highly-configurable, “bit-banged” SPI interface that allows for communication with external hardware (ADCs, DACs, protocol interface ICs, etc.) and enables “non-standard” SPI configurations.
  • An I2C port meant for interfacing with I2C-compatible inertial sensors
  • Concurrent, multi-board data capture capability. Multiple EVAL-ADIS-FX3 boards can be connected to the same PC and can concurrently capture data independently of each other
  • Very low CPU usage while capturing data, even on older Windows machines
  • Windows 7, 8, and 10 compatibility
  • 1.5“ x 1.75” PCB footprint
The EVAL-ADIS-FX3 does not include any onboard GPIO logic level shifters and is designed to only support 3.3V logic! The EVAL-ADIS-FX3 and may be permanently damaged if subjected to signals > 3.6V!

The open-source, MIT-licensed design files and resources are located in the iSensor FX3 API repository on GitHub (link). An EVAL-ADIS-FX3 may also be purchased here.

The image below outlines the various indicators and connectors available on the EVAL-ADIS-FX3.

The EVAL-ADIS-FX3 interface pinouts are also listed below.

The recommended mating connectors are listed in the image shown below.


The FX3 software stack consists of three parts.

- FX3 .NET API - FX3 Firmware - FX3 Evaluation GUI

The FX3 API manages all the complex USB transactions and implements all the necessary tools to begin capturing high-speed, high-performance data in custom applications. This .NET-compatible API, written in VB.NET and C#, includes data streaming features tailored to reliably capturing inertial sensor data at the maximum data rate. The API is also fully documented (Sandcastle), open-source, and is licensed under the MIT license. The API also includes a wrapper library, allowing users to use the same API in any development environment with support for .NET (MATLAB, LabVIEW, Python, etc.)

The FX3 Firmware was designed with compatibility and flexibility in mind. The firmware attempts to follow the Cypress program workflow and relies on FX3 system threading, execution priority, and event flags to execute firmware subroutines and transmit sensor data. Custom vendor commands trigger subroutines embedded in the firmware that read and write SPI data, measure external pulses, generate clock signals, and manage board configuration. Several SPI streaming modes are implemented, which allow applications to communicate with nearly every device in the iSensor portfolio. The firmware is fully documented (Doxygen) and was developed using the open-source development tools and API offered by Cypress.

The FX3 Evaluation GUI provides a boilerplate for developing custom test software in a .NET environment. The evaluation GUI also includes helpful data capture and display forms to help test and evaluate sensor performance.

resources/eval/user-guides/inertial-mems/evaluation-systems/eval-adis-fx3-developer-resources.txt · Last modified: 04 Mar 2021 17:42 by Juan Chong