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T J
T J
Senior III
September 9, 2020
Solved

Which is the Smallest processor that has Double Precision Floating Point ?

  • September 9, 2020
  • 5 replies
  • 1097 views

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    This topic has been closed for replies.
    Best answer by TDK

    Probably the STM32H7A/H7B WLCSP132 chips. (4.57 X 4.37 mm)

    5 replies

    TDK
    TDKBest answer
    September 9, 2020

    Probably the STM32H7A/H7B WLCSP132 chips. (4.57 X 4.37 mm)

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    T J
    T JAuthor
    Senior III
    September 9, 2020

    still 10x10mm, was hoping to get a smaller package.

    the L412 QFN-48 is 5x5 but only single precision..

    Tesla DeLorean
    Tesla DeLorean
    Guru
    September 11, 2020

    The F767 has the FPU-D

    https://www.st.com/resource/en/datasheet/stm32f767zi.pdf

    Most of these ICs have a lot of FLASH/RAM that contribute to the die size, the FPU-D is perhaps 3x size of FPU-S, I couldn't get the ARM guys to share specific info.

    LQFP100 H730AB

    https://www.st.com/resource/en/datasheet/stm32h730ab.pdf

    https://www.st.com/content/ccc/resource/sales_and_marketing/presentation/product_presentation/group0/cf/c2/fb/68/b5/11/48/52/Microcontrollers_STM32H7_Series_product_overview/files/Microcontrollers_STM32H7_Series_product_overview.pdf/jcr:content/translations/en.Microcontrollers_STM32H7_Series_product_overview.pdf

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    Danish1
    Danish1
    Lead III
    September 11, 2020

    One thing the OP didn't make clear was whether it is acceptable to do the floating-point in software.

    All the compilers provide software double-precision floating-point where it's needed. It will increase execution-time (hence power-consumption), and use up more FLASH. But often this is a good overall solution.

    But even the smallest stm32l0 can do it. A quick check found stm32l052T8 is 2.61 x 2.88 mm but I don't know if that's the smallest.

    T J
    T JAuthor
    Senior III
    September 12, 2020
    Yes, we need to shutdown quick, so hardware is the best answer.
    In the end, I Had to compromise, with the L433-48pin, will have to calculate the double from the Single Floating Point Hardware.
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