Configuring the DAC: DACREF_1 pin

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Configuring the DAC: DACREF_1 pin

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n00b1024
Contributor III

Hello,

I'm configuring the DAC on the Vybrid, and noticed a reference (Reference Manual, rev4) to DACREF as the voltage input. However, I haven't been able to find this pin on the Vybrid schematic (F-series, RevG), or on Vybrid_Pinout_1.1_-_F_Series.xlsx.

Thanks.

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anthony_huereca
NXP Employee
NXP Employee

Hi,

  Those are internal connections to the DAC module.

The following will be in the next revision of the RM:

For this device, external voltage supplied to VREFH_ADC pin is the only reference voltage for DAC reference.

User will need to set up DACx_STATCTRL [DACRFS]=1 to select the valid VREFH_ADC reference.

When DACx_STATCTRL [DACRFS]=0, the DAC reference is connected to an internal ground node and is not a valid voltage reference.

-Anthony

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anthony_huereca
NXP Employee
NXP Employee

Hi,

  Those are internal connections to the DAC module.

The following will be in the next revision of the RM:

For this device, external voltage supplied to VREFH_ADC pin is the only reference voltage for DAC reference.

User will need to set up DACx_STATCTRL [DACRFS]=1 to select the valid VREFH_ADC reference.

When DACx_STATCTRL [DACRFS]=0, the DAC reference is connected to an internal ground node and is not a valid voltage reference.

-Anthony

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