Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

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Description: The new uM-FPU v3.1 by Micromega has all the proven features of the v3 with some interesting new GPS NMEA string parsing features. The uM-FPU v3.1 chip interfaces to virtually any microcontroller using a SPI, I2C, or serial interface, making it ideal for applications requiring floating point math, including sensor readings, robotic control, GPS, data transformations and other embedded control applications. The uM-FPU v3.1 chip supports 32-bit IEEE 754 compatible floating point and 32-bit integer operations. The uM-FPU v3.1 is RoHS compliant, operates from a 2.7V, 3.3V or 5V supply, and is available in 18-pin DIP, SOIC-18 or QFN-44 packages.

Interface examples are available for BASIC Stamp, Javelin, PICAXE, 16F87x, ARMmite, and ARMexpress controllers.


  • 18-pin Wide SOIC
  • Supports both I2C, SPI, and serial interfaces
  • 256 byte instruction buffer
  • 128 general purpose 32-bit registers for storing floating point or long integer values
  • 8 temporary 32-bit registers to support parentheses in calculations
  • 2048 bytes Flash memory for user-defined functions
  • 1024 bytes EEPROM for data storage or user-defined functions
  • 10 to 20 times faster than uM-FPU V2 for all floating point operations
  • Up to 70 times faster for advanced instructions
  • Supports 2.7V, 3.3V and 5V supply voltage
  • I2C compatible interface up to 400 kHz
  • SPI compatible interface up to 15 MHz
  • Expanded instruction set, matrix operations, A/D conversion, string handling
  • Easy migration from uM-FPU V2
  • See What’s New in V3 for more details on new features

Floating Point Operations:

  • Tons of new functions
  • Set, Add, Subtract, Multiply, Divide
  • Sqrt, Log, Log10, Exp, Exp10, Power, Root
  • Sin, Cos, Tan
  • Asin, Acos, Atan, Atan2
  • Floor, Ceil, Round, Min, Max, Fraction
  • Negate, Abs, Inverse
  • Convert Radians to Degrees
  • Convert Degrees to Radians
  • Compare, Status

Long Integer Operations:

  • Set, Add, Subtract, Multiply, Divide, Unsigned Divide
  • Negate, Abs
  • Compare, Unsigned Compare, Status

Conversion Functions:

  • Convert 8-bit and 16-bit integers to floating point
  • Convert 8-bit and 16-bit integers to long integer
  • Convert long integer to floating point
  • Convert floating point to long integer
  • Convert floating point to ASCII
  • Convert floating point to formatted ASCII
  • Convert long integer to ASCII
  • Convert long integer to formatted ASCII
  • Convert ASCII to floating point
  • Convert ASCII to long integer


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Customer Comments

  • NB - this product comes marked as a Microchip dsPIC (the ones I have here are dsPIC30F3012). This confused the heck out of me, but I guess it turns out these FPUs are implemented in a dsPIC. Crazy!

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