VDD and actual Reset level with nRF51802

[Kenny]

Using a nRF51802, but can't find data about actual reset level other than min.  VDD 1,8V ?? (Page 34 in datasheet )

I need to know actual reset level (VDD) for both rising and falling signals

- I need to determine if I have to use other external components as translators or something else, or if I can do reset by 1,7 V etc.  

Where can I find more detailed description of these kind of levels ??

Please Take a look and let me have your best suggestions on above or a link to nessesarry data in data sheets etc.

Best regards and a very good day

Kenny Teist

[Kenneth]

Hi,

The minimum operating conditions is 1.8V, this means that we guarantee that the chip operate down to this level. Below 1.8V the nRF51 will trigger BOR before it may fail, the exact voltage level will vary a bit due to variation in process and state. We don't have any exact value to how low you must pull VDD to ensure BOR to always trigger. For instance if the chip is in sleep state, the voltage may actually fall well below 1.8V without BOR to trigger, as long as VDD is above 1.8V when it wakeup. I recommend that if you want to reset the nRF51 you either use pin reset or pull VDD to less than <0.3V.

Best regards,
Kenneth