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Multiple Single-Channel Single-Conversion Mode vs Repeat-Single-Channel Mode - which uses more power?

Kai
Prodigy 170 points

Hi,

I'm using a MSP430 F5 IC, with an ADC12. I need to get the ADC result from a point continously.

I can do it 2 ways: either doing a Single-Channel Single-Conversion over and over again, or do Repeat-Single-Channel conversion. Between each conversion I need to transmit the result out using RS232.

The question is: which method uses less power?

  • 0
    TI__Expert 7845 points

    This depends on how time you have between each measurement. The best way to find out which is lowest power may be to try the following 2 code examples from the following zip file:
    http://www.ti.com/lit/zip/slac166

    msp430x54x_adc12_01.c & msp430x54x_adc12_07.c

    In "msp430x54x_adc12_01.c", you will have to edit it to use the internal reference instead of AVCC and chose to go into LPM4 between conversions instead of LPM0. Then you have to wake up from LPM4 inside your ISR.

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