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Question, i.MX28 DCDC converter setting

Question asked by AVNET JAPAN FAE (team share account) on Feb 7, 2014
Latest reply on Mar 6, 2014 by Ming On Lai

Dear All,


I would like to ask about USE_VDDXTAL_VBG setting for i.MX28 DCDC converter.

In i.MX28 reference manual, the description of USE_VDDXTAL_VBG bit is said as follows.

“Change the reference used in the dcdc converter to a low power, less accurate reference.”

Could you show me more details about the “change” by USE_VDDXTAL_VBG bit setting?


Does it mean the accuracy gets worse than +/-3% that is described in datasheet when the bit set to low power?