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MSP430_ADC

PRASANTH S
Intellectual 380 points
Other Parts Discussed in Thread: MSP430F5438A

Hi all,

        I am using MSP430F5438A microcontroller.......

I want to use ADC available with that microcontroller.. could u please tell me the sampling rate and conversion rate of the ADC12_A.

I want to know how to calculate the sampling frequency.... if suppose i am using a MCLK and PDIVx and DIVx are 1........

Thank you

  • 0
    TI__Expert 4915 points
    Hi Prasanth,

    According to the MSp430F5438A datasheet, section 5.36, fACD12CLK = 5MHz. Conversion rate is up to 200ksps.

    Thanks,
    Mitchell
  • 0 in reply to Mitchell
    Intellectual 380 points

    Thanks for your reply,

                    I found the max ADC12CLK frequency is 5 Mhz.

                   I want to know one more thing, what are the default frequency ranges for MCLK, SMCLK, ACLK.?

  • 0 in reply to PRASANTH S
    TI__Expert 4915 points
    Hi Prasanth,

    After a PUC, the Unified Clock System module default configuration is as follows:

    - MCLK is sourced from DCOCLKDIV (~1.048 MHz)
    - SMCLK is sourced from DCOCLKDIV (~1.048 MHz)
    - ACLK is sourced from XT1CLK (LF mode, which is XT1 at 32.768 kHz)

    When crystal startup is obtained and settled, the FLL stabilizes MCLK and SMCLK to 1.048576 MHz and fDCO = 2.097152 MHz. The UCS module can be configured or reconfigured by software at any time during program execution.

    This information came directly form Section 5.2 of the device user's guide, so please reference that document if you'd like to learn more about the different ways you can customize the UCS module.

    Thanks,
    Mitchell

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