• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Subscribers 82 subscribers
  • Views 650 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430 16 channel ADC12 on a 64 pins chip?

Guillaume FINISTERE
Prodigy 160 points
Other Parts Discussed in Thread: MSP430F5529, TMS320F28030

I'm searching for an MSP430 which includes a 16 channel ADC12 but which does not have more than 64 pins. Does it exist?

  • 0
    Guru 17650 points

    Hi Guillaume,

    TI has a nice MCU SELCTION TOOL. You can access it i.e. from the MCU starting page (http://focus.ti.com/mcu/docs/mcuhome.tsp?sectionId=101&DCMP=TIHomeTracking&HQS=Other+OT+home_p_micro).

    When selecting MSP430-ADC resolution >=12-ADC Channels >=16 you will get a result which is showing you that the smallest available package with this features is a 80pin LQFP (i.e. MSP430F5529). In case of a 64-pin (QFN) packeage the maximum is 12 ADC Channels.

    Cortex A3 doens't have a 12-bit ADC; from the C2000 series the TMS320F28030/1 would fit your requirements (16chan 12 bit ADC in a 64pin TQFP package).

    Rgds
    aBUGSworstnightmare

  • 0
    Guru 227245 points

    If you really need 16 separate input channels, none of the MSPs will do the job for you.

    The smaller ones (e.g. 1611) with 64 pins have a 12 channel ADC from which only 8 are external and 4 are internal.

    The others have 80 pins at least and from the 16 channels, only 12 are available as external inputs.

    If you don't need all inputs at the very same time, you can multiplex them by using e.g. a DG409DY multiplexer chip. With this, you can sample one channel, change the port pins, sample the other one. You can also use this to switch the input to a reference voltage or GND for calibration There are variants with 1*1-of-8, 2*1-of-4 and a version with three independently programmable one-of-2 multiplexers. Depending on the required signal quality and precision, it could do the job for you.

    If, of course, the requiest for a maximum pinout of 64 is because of overall PCB space usage, then there's only one way: use an external ADC chip and a small MSP like the 1232. It _could_ fit, but I make no promises. :)

  • 0
    TI__Mastermind 26380 points

    Hello,

    I would just like to point out that the 5xx devices like the F5438A have 12 configurable ADC channels: A0 - A7 & A12- A15.

    If there is no need for an external reference you can add 2 to this count as the Veref+ and the Veref- pins can be used as ADC channels 8 and 9.

    Regards,

    Priya

  • 0 in reply to Joerg Quinten
    Prodigy 160 points

    Thanx for the MCU Selection Tool, i didn't know it.

    Guillaume

  • 0 in reply to Guillaume FINISTERE
    Prodigy 60 points

    You can use an external multiplexer, 74HC4051 or similar. This way you can get additional 7 channels.

  • 0 in reply to VentsislavKaradzhov
    Prodigy 160 points

    I prefer not using external additional component in my design. Thanx for the reply

**Attention** This is a public forum