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MSP430F677x SD24 power down

INg
Genius 3475 points

Hi

SD24  will Auto Power-down ,when

1. Converter are disable

2. Converter are not active

I quote form the user guide

"

29.2.5 Auto Power-Down
The SD24_B is designed for low-power applications. When a SD24_B converter is not actively converting,
it is automatically disabled; it is automatically re-enabled when a conversion is started. When a converter
is disabled, it consumes no current.

"

Is my understanding that when a SD24 conversion is not triggered by software the SD24 is power down automatically, if so what is the recovery time from disable to start conversion.

Would there be a bit to monitor the status of the SD24?

Ivan

  • 0
    Guru 227245 points

    The delta-sigma converter operation relies on a constant samplign of th einput. If you stop the SD24, it's internal data buffer for the digital filter become simmediately invalid. If oyu restart it, the first three conversion results will wotrk with outdated data and produce bogus results. (this is why there is an option to delay the first interrupt by three conversion).

    Ivan Ng said:
    Would there be a bit to monitor the status of the SD24?

    Depending on operating mode (chained/synchronized operation of multiple SD24), this would be the SD24CS bit.

    From users guide:

    "Start of conversion or trigger generation. Software controlled start of conversion if SD24SCS = 00b. Manual stop of conversion (independent of SD24SCS setting).
    If a conversion is ongoing (triggered by any source selected through SD24SCS) this is indicated by SD24SC = 1.
    0b = No conversion start or stop conversion
    1b = Start conversion or trigger generation"

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