FEZ Cerb40
FEZ Cerb40
Part # CRB40-GB-353
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  • FEZ Cerb40
  • FEZ Cerb40
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FEZ Cerb40 is 100% open source hardware board that combines the FEZ Cerberus' 32-bit 168Mhz processor and core software on a very small circuit board, in a DIP40 format. This board is ideal for low-production run and for easy prototyping. Developers normally start with FEZ Cerberus mainboard for easy plug-and-play and then later use FEZ Cerb40 to live permanently in a product.

Whether using .NET Gadgeteer, .NET Micro Framework or even use native programming, developers will enjoy the benefits from FEZ Cerb40.

Key Features:

  • .NET Micro Framework 4.2 (supporting C# and Visual Basic) 
  • 168Mhz 32bit STM32F4 processor with floating point.
  • 1MB FLASH and 192KB RAM.
  • Runs FEZ Cerberus software.
  • Very compact yet exposing 36IOs.
  • Software and hardware support, but not limited to, PWM, AnalogIn, AnalogOut, UART, SPI, I2C, CAN, USB Client, USB Host.
  • Ultra small, 2.0 x 0.75 inches.


  • Runs off single 3.3V power source.
  • Low power and hibernate modes
  • Active power consumption TBD
  • Idle power consumption TBD
  • Hibernate power consumption TBD


  • Operating temperature: TBD
  • RoHS compliant /Lead-free compliant

This product is for users with hardware and soldering experience. Software developers can use FEZ Cerberus

Details on using FEZ Cerb40 are found on this page This page also lists the current firmware state, not all features are implemented yet.

Processor 168 Mhz 32-bit Cortex-M4
User Available FlashTotal Flash memory available for user applications 300 KB
User Available RAMTotal RAM memory available for user applications 112 KB
GPIOGeneral Purpose Input/Output 34
PWMPulse-Width Modulation 9
Analog In 9
UARTUniversal Asynchronous Receiver/Transmitter 2
SPISerial Peripheral Interface 1
I2CInter-Integrated Circuit Yes
Networking Ethernet without SSL
CANController Area Network 1
Analog Out 2
USB Client Standard
USB Host Yes
1-Wire Yes
Real Time Clock YesA crystal is needed.
In-Field Update No
Supported Image Type BMP
Memory CardsIncludes 4-bit Secure Digital (SD), Secure Digital High-Capacity (SDHC) and Multi-Media Card (MMC) support. Yes
Operating Temp. -20 to +70°C
DimensionsMeasurements in millimeters. 18.6 x 52.4 x 5.7
Weight 4 g
RLPLibrary functions that provide ability to add native C/Assembly code to .Net Micro Framework applications. RLPLite