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ADC12 requires Vcc >= 2.2V ?

Jeff Tenney
Guru 12160 points

Does anybody have experience with using the ADC12  in a 1.8V system? Or have any insight whether it should work?

The data sheets (for 5xx devices) say that ADC12 requires Vcc >= 2.2V.  Everything else inside the MCU seems pretty happy with 1.8V (except the REF module of course).

Will the ADC12 function with 1.8V even with degraded performance?

Jeff

  • 0
    Guru 227245 points

    Jeff Tenney said:
    Will the ADC12 function with 1.8V even with degraded performance?

    This is possible. However, there is no information about how much it will degrade. So all you can do is trying.

  • 0
    Expert 2740 points

    Jeff Tenney said:
    Will the ADC12 function with 1.8V even with degraded performance?

    You need :

    A: Luck

    B: Slower conversion clock

    Peter

  • 0 in reply to Peter Dvorak
    Guru 12160 points

    Thanks Peter and JMG.

    I am a big fan of MSP430 but I'm disappointed with this 2.2V requirement.  I also miss the DAC12 in small form factor MSP430 now that we are using the 5xx.  (It is available only in the 100+ pin packages.)

    Sadly, the call from Cortex-M0+ land keeps getting louder.

    Jeff

  • 0 in reply to Jeff Tenney
    Guru 46710 points

    Jeff Tenney said:
    Sadly, the call from Cortex-M0+ land keeps getting louder.

    There's no universal tools. Most probably msp430 will excel Cortex-M0+ in other areas. BTW which exactly ARM chip meets your requirements?

  • 0 in reply to Ilmars
    Guru 12160 points

    Ilmars said:
    BTW which exactly ARM chip meets your requirements?

    Have been looking at Kinetis KL15Z128 (Freescale).  It's even available in a 5mm x 5mm QFN32 still with 128K flash, 16K RAM, and nice peripherals built in.  All 1.8V from what I can tell.  Of course there are bigger packages available if more pins needed.

    Like you said, MSP430 does still win in certain characteristics.  But for how much longer who knows.  The M0+ stuff seems to be advancing very quickly.

    Jeff

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