topic Re: LPC55S69 : adc reference voltages in LPC Microcontrollers

LPC55S69 : adc reference voltages

EugeneHiihtaja — Wed, 04 Mar 2020 09:40:39 GMT

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

Re: LPC55S69 : adc reference voltages

jeremyzhou — Thu, 05 Mar 2020 04:00:34 GMT

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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Re: LPC55S69 : adc reference voltages

EugeneHiihtaja — Thu, 05 Mar 2020 06:31:58 GMT

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

Re: LPC55S69 : adc reference voltages

jeremyzhou — Thu, 05 Mar 2020 07:59:21 GMT

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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