need help temp sensor design

Hi, anyone here can help me design a temp alarm sensor for a freezer? the temp required is -40 to -50 degrees celcius only. Anything beyond this limit an alarm will sound. I was hoping to use the AD7314 for this project...

thanks

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  • Hi Ronald,

    The AD7314 is only rated from -35°C to +85°C.

    Some devices that may interst you for this project are:

    • The ADT75. This is 2 degree accuracy, i2c interface, digital temperature sensor. It operates between   -55 to +125°C. There is an alert pin and a programmable alert register to set the trip point,
    • The ADT7310 is a 0.5°C accurate SPI interface Digital temperature sensor. This has a critical Temperature and interupt pin that can be preset to trip at a high and low value with programmable hystersis register.
    • The ADT6401 is a 3pin hardwire programmable temperature switch which can achieve a tripping point of -45°C and a hystersis of 2-10°C.
    • The ADT6501 area a series of preprogrammed temperture switches with trip points ranging from -45°C to +150°C

              information on this part and its variants can be found Here http://www.analog.com/static/imported-files/data_sheets/ADT6501_6502_6503_6504.pdf

    Kind Regards,

    Rob

Reply
  • Hi Ronald,

    The AD7314 is only rated from -35°C to +85°C.

    Some devices that may interst you for this project are:

    • The ADT75. This is 2 degree accuracy, i2c interface, digital temperature sensor. It operates between   -55 to +125°C. There is an alert pin and a programmable alert register to set the trip point,
    • The ADT7310 is a 0.5°C accurate SPI interface Digital temperature sensor. This has a critical Temperature and interupt pin that can be preset to trip at a high and low value with programmable hystersis register.
    • The ADT6401 is a 3pin hardwire programmable temperature switch which can achieve a tripping point of -45°C and a hystersis of 2-10°C.
    • The ADT6501 area a series of preprogrammed temperture switches with trip points ranging from -45°C to +150°C

              information on this part and its variants can be found Here http://www.analog.com/static/imported-files/data_sheets/ADT6501_6502_6503_6504.pdf

    Kind Regards,

    Rob

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