Hi,
I'm planning a PCB with the LPC5514JBD64E MCU.
The user manual specify that "VREFL is always from an external pin and must be at the same voltage potential as VSSA" (39.4.1)
UM11295, https://www.mouser.com/pdfDocs/UM11295.pdf
On the other hand, the datasheet specify that VREFN is not connected to an external pin(64 pin HTQFP) (Table 3. Pin description)
https://www.nxp.com/docs/en/nxp/data-sheets/LPC55S1x_PDS.pdf
How can I use the ADC?
Does VREFN is internally connected to GND?
