ADT7302 temp sensor initialisation

Hi EngineerZone,

I'm looking to design in the ADT7302 but interested in what happens when the device is initiated. I'm interested in what happens once the chip initially powers up and what is needed to get the first guaranteed good reading. Also, out of reset, does the chip default to its powerdown mode or is a command needed to take out of powerdown? Would it self-initiate a temperature reading out of reset, or would that need to be explicitly initiated? Also, until that first reading has been completed what value is seen on the SPI? Hopefully you can offer some clarification on this as I can't see anything on the datasheet for this.

Many Thanks.

  • 0
    •  Analog Employees 
    on Jan 14, 2015 10:26 AM

    Hi,

    On power-up the part goes automatically into normal mode, if the shutdown mode is required, it is set via the configuration register and the part will go back out of this mode by writing all zeros to the configuration register. Once it is powered-up, first conversion data should be ready on the register 1.2 ms later, which should be ok. However, by reading it, the read operation itself will reset the internal clock and a new conversion will take place, so 1.2ms later you could read again the register and get a new data.

    Provided ADT7301 and ADT7302 have the same die, I would suggest using EVAL-ADT7301EBZ for further evaluation purposes if that suits to you.

    Best regards,

    Lluis.