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ADS7142: Pin 5 (Busy/RDY) and Pin 6 (Alert) connection

Kum Hoo Lee
Expert 1855 points
Part Number: ADS7142

Dear Sir/Madam,

I would like to use ADS7142 to do ADC measurement for 2 NTC as per below schematic design. May I know if I could leave pin 5 and 6 dangling by not connecting to anywhere since these 2 pins is the output pin (this is due to I have not enough MCU GPIOs and space constraints). Is these 2 pins a must to connect to MCU for this case? Hope to hear from you soon. 

Hope to hear from you soon

Thanks and best regards,

KH

  • 0
    TI__Mastermind 24940 points

    Hello,
    If you are not using the ALERT pin, then this can be left floating. Although, what mode are you using the device in? The alert is very helpful to monitor the NTC response if you are looking for a threshold crossing.

    The BUSY pin can also be left floating. It is helpful to watch this signal as it notifies the user when the device is converting, and it is recommended to monitor this signal. I suggest to keep this signal available for debugging purposes. If you feel confident in the system and timing, then you may leave this unconnected.
    Regards, Cynthia