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BQ79606A-Q1: TSREF vs REF1?

AnBer
Mastermind 28880 points
Part Number: BQ79606A-Q1

Team,

Looking at section 8.3.4.4.3 Fig 17 page 33 and section 9.2.1.2.8 page 235 of the datasheet SLUSDQ4:

-In which case is TSREF or REF1 used? Can the reference be switched at run time and when?
I have seen as well that the TIDA-01537 that TSREF is unused.
-Does the https://www.ti.com/tool/BQ79606A-EXAMPLE-CODE   show case this ?

Thanks in avdvance,

A.

  • 0
    TI__Genius 9301 points

    Hi,

    TSREF is used as reference for the GPIO measurement when the GPIO is configured as ratiometric. If configured as absolute measurement, then REF1 is used as reference.

    For example, if the specific GPIO is used for temperature measurements through an NTC as shown in figure 45 in the device datasheet, then customer can configure the ratiometric mode to get more accurate results. Otherwise, if the specific GPIO is used as a general purpose input for voltage measurement as shown in figure 46, then they should leave it configured as absolute measurement. 

    This is controlled for each GPIO by writing to register GPIO_ADC_CONF. If the configuration is changed, then the ADC needs to be restarted.

    The sample code does not include GPIO measurements, it only has initialization procedure and basic sample code for Main ADC Cell measurements.  

    Best regards,

    Leslie