Cheapest MCU according to my project's constraints

Discussion in 'Embedded Systems and Microcontrollers' started by lorenzo.pilastro, Jul 5, 2018.

  1. lorenzo.pilastro

    Thread Starter New Member

    Jun 25, 2018
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    Dear members of the forum, I am looking for the cheapest MCU with the following constraints:

    Program Memory Type and size: Flash, 3K
    SRAM bytes: 128 bytes
    Watchdog timer: yes, programmable
    Sleep modes: yes, sleep mode powerr down needed
    Temperature Range (C): -40 to 85
    Operating Voltage Range (V): 2.5 to 5.5 Volts
    I/O: 1 digital output

    This kind of micro is just supposed to blink a led using sleep mode for the lowest power consumption possible, thus no particoular constraints of CPU speed is requested. However, if you need any additional spec feel free to ask.
    For my proto PCB, I have used the following MCU: ATtiny45 with good results. However, I was wondering if a cheaper MCU could exist. Do you have any idea?

    Thanks in advance for anyone who could help!
     
  2. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
    6,698
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    How many do you plan on making?
     
  3. lorenzo.pilastro

    Thread Starter New Member

    Jun 25, 2018
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    Dear Albert, thank you for your reply. The idea is to find the cheapest MCU that mets the constraints for mass production.
     
  4. danadak

    Well-Known Member

    Mar 10, 2018
    1,949
    403
    Volume is everything when negotiating with vendors.

    Are you making 1K or 1M,~ number you think you are going to sell ?

    And product lifetime affect choice ?

    8 or 16 bit ?

    Regards, Dana.
     
  5. jayanthd

    Active Member

    Jul 4, 2015
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    Can you use PIC12F series MUCs ?
     
  6. lorenzo.pilastro

    Thread Starter New Member

    Jun 25, 2018
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    0
    Hi Dana, thank you for your replies.
    1. The numbers would be greater than 1M.
    2. From what I can see from the web, there's an average of 10/15 years of longevity for the MCU. This would be way more than needed for the average use of this device.
    3. I think 8 bit architecture is enough

    @jayanthd thank for your suggestions, I will take a look to the datasheet/price of that MCU!
     
  7. jayanthd

    Active Member

    Jul 4, 2015
    698
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    microChipDirect.com is the place to check the prices of Microchip microcontrollers.
     
  8. danadak

    Well-Known Member

    Mar 10, 2018
    1,949
    403
    With those kinds of volume you should be talking direct to
    the vendors, involve their RSM (Regional Sales Manager)
    in the discussion. And forward pricing should be discussed.

    In the back of my ratty mind I recall there was a swiss vendor that
    made ultra low cost UPs for watch, lock applications, cannot seem
    to remember who it was...20 cent like parts......

    I would contact Microchip, Cypress (PSOC 1 and 4 devices), Freescale
    8 bit low end....ST ......ROHM.

    Make the vendors work for you....


    Regards, Dana.
     
  9. MrChips

    Moderator

    Oct 2, 2009
    17,381
    5,367
    Go to any of the major industrial supplier's websites (Digikey, Farnell, Mouser) and you can do a parametric search.

    If price is your top criteria, ATtiny5 sells for US$0.14 in 100 quantity.
    ATtiny414 is US$0.47.
     
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