RX21A 24Bit ∆Σ A/D Conversion：
BGR_BO pin applied voltage 1220mV (Typ.)，
EXREF = 1 ( 0: Generates reference voltage from on-chip BGR circuit. 1: Generates reference voltage from voltage applied to BGR_BO pin. )
When the internal voltage is used, the sampling value is unstable. What may be the reason?
When using an external reference voltage，Are there some special requirements for this external reference voltage range, and is there a corresponding similar schematic diagram for reference？
Park said:When the internal voltage is used, the sampling value is unstable. What may be the reason?
Did you set the BGRE bit in the DSADRCR register to 1? That might be the cause.
Since you weren't able to reply to this post anymore, I've verified JB's answer and I'm going to lock this thread now. Kindly create a new discussion if ever you have other questions or issues. All the best!
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