Inquiries about EXT_CAP of AD5271

Inquiries about EXT_CAP of AD5271


Hi all,

For circuit reasons, we are using the AD5271 with a voltage of Vdd:3.300V and Vss:-1.720V.


We are using only RAM because writing to ROM does not work well, probably due to Vss.

I am using RAM only.


So, please tell me about the following.

・ If the EXT_CAP pin is not used, what potential should it be fixed at?


If it is used for a charge pump, I think OPEN is better, but what do you think?


Best Regards,