LPC55S69 : adc reference voltages

[EugeneHiihtaja]

Hi !

In source code I can see the next enumeration :

/*!
* @brief Define enumeration of reference voltage source.
*
* For detail information, need to check the SoC's specification.
*/
typedef enum _lpadc_reference_voltage_mode
{
kLPADC_ReferenceVoltageAlt1 = 0U, /*!< Option 1 setting. */
kLPADC_ReferenceVoltageAlt2 = 1U, /*!< Option 2 setting. */
kLPADC_ReferenceVoltageAlt3 = 2U, /*!< Option 3 setting. */
} lpadc_reference_voltage_source_t;

But it is no any exact information in UM or DS about it.

Could you explain a bit  what option correspond to what settings ?

Regards,

Eugene

[jeremyzhou]

Hi Eugene Hiihtaja,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
The enum value is used to select the voltage reference as below shows.

Have a great day,
TIC

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[EugeneHiihtaja]

Hi jeremyzhou‌ !

Could you confirm if VREFP is implemented on scheme of LPC55S69-EVK in correct way.

I can see it connected to VDDA_TARGET. Or in this way it is good enough  reference voltage for ADC ?

br,Eugene

[jeremyzhou]

Hi Eugene Hiihtaja,

1) In this way it is good enough  reference voltage for ADC ?

-- Yes, it's Ok.

Have a great day,
TIC

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Note:
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