Functional Description

Table of contents

  1. Overview
  2. Features
  3. Block Diagram
  4. Orientation
  5. Power Supply
    1. Recommended
    2. Power Usage

Overview

ModalAI Flight Core is a Pixhawk FMUv5x-derived flight controller. It’s goal is to be software compatible with the FMUv5x architecture in a smaller Pixracer-style form factor.

fss-top-with-quarter.png

Features

Feature Details
MCU 261MHz, 32-bit ARM M7 STM32F765II
Memory 256Kb FRAM
  2Mbit Flash
  512Kbit SRAM
Firmware PX4
IMUs ICM-20602 (SPI1)
  ICM-42688 (SPI2)
  BMI088 (SPI6)
Barometer BMP388 (I2C4)
Secure Element A71CH (I2C4)
microSD Card Information on supported cards
Inputs GPS/Mag
  Spektrum
  Telemetry
  CAN bus
  PPM
Outputs 6 LEDs (2xRGB)
  8 PWM Channels
Extra Interfaces 3 serial ports
  I2C
  GPIO

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Block Diagram

fmu-dk-preliminary-datasheet.png Figure 1

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Orientation

The following is a ‘top down’ view of the FMU depicting a ROTATION_NONE setup.

FMU Orientation

Power Supply

A 5VDC supply is required to power the FMU. The VOXL-PM regulator board is recommended, which also provides battery voltage and amperage monitoring through an I2C interface.

Multiple connectors allow a 5VDC supply to be connected (see connectors page )

  • J6 - recommended
  • J1/J4/J5

Power Usage

NOTE: The following is preliminary data.

Test configuration:

  • Using a 5VDC supply
  • Using PX4 this commit
Use Case Typical Usage (Peak)
Idle 180 mA
Idle, with GPS (HolyBro Pixhawk 4, Second GPS) 260 mA
Idle, with Spektrum DSMX 200 mA
Idle, with Holybro Telemetry 230 mA
Idle, with GPS/Spektrum/Telemetry 330 mA

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