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How Power-on reset work on AD5689R?

Question asked by sss on Dec 17, 2014
Latest reply on Dec 21, 2014 by msamera

Hello,

I have several question about AD5689R Power-on reset and power up sequence.

 

1)What function is the Command 0110 for this software reset ?

Is it the same function for Hardware reset (/RESET) with RSTSEL pin? ,or register is clear/default?

 

2)For initial power-up (cold start) to enter normal mode (not exit from power-down mode),

after VDD and VLOGIC power-up to 90%,

how long times wait "Power-Up Time" to RESET?

 

In datasheet, there are two specifications, but  "Coming out of power-down mode" specifications.

 

Power-Up Time

2.5μs;Coming out of power-down mode; VDD = 5 V

 

Power-Up Time

4.5μs:Time that is required to exit power-down and enter normal mode of operation; 24th clock edge to 90% of DAC midscale value with output unloaded

 

Thank you for your help in advance.

Regards,

sss

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