AD5111, shutdown mode

Hi,

 

I had a question on AD5111 shutdown mode which is described in datasheet page 18 (Rev.B) as follows.

 

The AD5111/AD5113/AD5115 return the wiper to prior shutdown position if any other operation is performed.

 

Q-1) What is the meaning of "prior shutdown" ?

Is it indicating prior occurence of "shutdown command" which is described in same paragraph ?

Or it is including some other cases, example, unintended supplied power down ?

 

Q-2) I assume it means AD5111 is storing the wiper position when prior "shutdown(which of Q-1)"  maybe in EEPROM.

Is it separate from the value which is stored by EEPROM Write Operation ?

 

Q-3) It may be a same question as Q-1, but if unintended power down occurs when operating in position 100, for example, and EEPROM is holding position 50 written by prior write operation, what is the position value it will start at next re-starting ?

 

Sorry for these fundamentals, but your helps would be very much appreciated.

 

Best Regards, 

Parents
  • Hi,

    Thank you for your reply.

    Please let me confirm as follows, and please remedy if wrong.

    1) Shutdown is not indicating power down. It is indicating intentional cutoff of terminal-A during power is still on, which is controlled by shutdown command from external.

    2) RDAC value is never be stored into EEPROM unless write command is effective.

    3) RDAC register is volatile and must be lost if sudden unintended power down occurs.

    Sorry for these fundamentals again, and your confirmation would help us to understand the parts.

    Best Regards,

Reply
  • Hi,

    Thank you for your reply.

    Please let me confirm as follows, and please remedy if wrong.

    1) Shutdown is not indicating power down. It is indicating intentional cutoff of terminal-A during power is still on, which is controlled by shutdown command from external.

    2) RDAC value is never be stored into EEPROM unless write command is effective.

    3) RDAC register is volatile and must be lost if sudden unintended power down occurs.

    Sorry for these fundamentals again, and your confirmation would help us to understand the parts.

    Best Regards,

Children
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