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MSP430F6779: SD24 module Errata

kyt
Expert 2355 points
Part Number: MSP430F6779

Hi, all

 

I have a question about MSP430 Errata of SD24_B Module.

 

 

1)Is this errata applied only in case of -VFS MAX voltage ,or from zero to -VFS MAX range at the input?

2)Does an erroneous output mean fixed value or indefinite value?

 

The SD3 of MSP430F6779 Device Errata described as below:

www.ti.com/.../slaz350s.pdf

Function:

Incorrect conversion result in twos complement mode when -VFS is applied

 

Description:

When the SD converter is configured in twos complement mode with left or right

alignment and any OSR setting, applying the -VFS voltage at the input will result in an

erroneous output.

best regards,

 

kyt

  • 0
    TI__Guru**** 211887 points

    Hi kyt,

    Attached is some simple test data that displays the referred-to errata: F6779xA_DataFormat_Output.xlsx

    As you can see, it relates to the max VFS- voltage applied resulting in a value of 1 above the supposed maximum limit. Please keep in mind that the SD24_B analog input range should not exceed 80% of VFS+ or VFS- as mentioned in note 1 of the SD24_B Power Supply and Recommended Operating Conditions Table of the Datasheet. This alone should remove the error of falsely giving a value from the 2's complement value, and all values will follow the format outlined in the User's Guide.

    Should an error condition exist where such a value is applied to the input, the device will give the incorrectly calculated value. This spans for both left and right aligned 2's complement data formats for all OSRs. If you would like to ensure that an incorrect value (even if just by a value of 1) does not get sent, this does not affect the offset binary data format.

    Regards,
    Ryan

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