This document is not up-to-date, please refer to the Japanese document.

RAVEN HardWare Specification

Detailed hardware information about RAVEN.

Table of Contents


  • STM32F767 MCU( Cortex®-M7@216MHz, 2MB Flash, 512KB SRAM )
  • 64Mbit SPI Serial Flash
  • WLAN module( 802.11 b/g/n )
  • User defined LED and Switch
  • DAPLink interface
    • Drag-and-drop programming
    • USB Virtual COM Port
    • CMSIS-DAP Debugger
  • Four Multi-function I/O Connectors
    • Compatible with 3.3V sensor and actuators
    • Multiple peripheral functions( ADC/UART/I2C/PWM )
    • Each port is capable of supplying up to 50 mA


General Specifications

  • Dimensions
    • 75mm x 35mm x 12mm( WxDxH )( excluding projections )
  • Rating
    • Approx. 5V/2.5W( Power Supply : via micro-USB terminal )
  • Weight
    • Approx. 22g

Technical Specifications

Please refer to the charts below for the ratings and the specifications of the unit.

Absolute maximum ratings

Ratings Symbol Min Max Unit Comment
Power supply voltage VBUS -0.3 5.5 V -
Input voltage(PORT) VIO -0.3 7.0 V Excluding "+3.3V OUT" Pin
Input voltage(USB) VUSBIO -0.5 3.6 V VBUS=0V
Operating temperature Topr -20 70 deg.C No condensation

General operating conditions

Ratings Symbol Min Max Unit Comment
Standard operating voltage VBUS 3.0 5.25 V -
Operating temperature range Ta 0 40 deg.C No condensation
Operating humidity range RH 20 80 % -

Electrical characteristics

Ratings Symbol Min Max Unit Comment
Output voltage(Power pin) VO 3.1 3.45 V TYP=3.3V
Output current(Power pin) IO - 200 mA 4ports total
High-level output voltage(I/O pin) VOH VO-0.4 VO V IIO = -8mA
Low-level output voltage(I/O pin) VOL 0 0.4 V IIO = 8mA
High-level input voltage(I/O pin) VIH 0.7*VO VO V -
Low-level input voltage(I/O pin) VIL 0 0.3*VO V -
leakage current(I/O pin) Ilkg - 3 uA 5V,Input,Disable PU/PD

Notes on the Ports

  • I/O connectors can be configured to assign different functions by flow settings, and therefore these are defined as "Ports" in this documentation.
  • The Ports operate at 3.3V. Sensors/actuators which are specifically designed for 5V operation are not compatible with this unit.
  • The Ports are not designed to be disconnected while in operation(they do not support "hot swapping"). Please remember to turn the power off before connecting to or disconnecting sensors/actuators from the Ports.
  • The maximum current for each Port is rated at 50mA(the total current of 4 Ports at 200mA). Please pay attention not to exceed these limitations.
  • Do not feed power into the power terminals of the Ports. Such an action can cause damages on the unit.
  • The power supply of sensors/actuators cannot be controlled from Flows (RAVEN constantly supplies power to these Ports).
  • Signal pins(SIG1/2) on the Ports 1-4 are connected through the protective registers (33ohms). When a Port is active, its function, I/O and its pull up/down state are defined within the flow. At the power-on state(before flows are read into internal firmware), all Ports are disabled.

    • PORT3/4
      • When these ports are disabled, they are configured as input ports and are pulled-down by MCU approximatelly at 40 kilo-ohms.
    • PORT1/2
      • When these ports are disabled, they are configured as input ports and are pulled-up by MCU approximatelly at 4.7 kilo-ohms.
      • When these ports operate as I2C or SDL/SDA lines are pulled-up at 4.7 kilo-ohms.
  • There are limitations to the functions each Port can be configured to.

Please refer to the diagram for the details.
NOTE: The diagram mentions PWM(TMR) and UART, however these features have yet been implemented.


Notes on the Internal function block

  • SPIFlash, WLAN module, MbedI/F(DAPLink), the Ports, the user switch, and the user LED are connected around main MCU(STM32F767).
  • The SPIFlash is reserved by the system and currently cannot be accessed from flows.


Notes on the Internal Power block

  • The input voltage which is fed through the microUSB connector is conveted into 3.3V by the Buck-Boost regulator, then supplied to internal circuitry and Ports.
  • The internal power block is protected by a Poly Switch directly next to the USB line and the built-in protection of the Buck-Boost regulator.


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