• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 46 subscribers
  • Views 208 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1192: Unused pin

Michiaki Tanii
Expert 4370 points
Part Number: ADS1192

Hi

 

The below pins will be unused.

Customer would like to address to open the below unused pins due to constrained board space.

 

-       IN2N, IN2P, IN3N, IN3P, RLDOUT, RLDIN/RSDREF, RLDINV, GPIO1, GPIO2

 

We would much appreciate you advise how to deal with on the above pins

Thank you and best regards,

Michiaki

  • 0
    TI__Mastermind 47755 points

    Hello Tanii-san,

    Un-used analog input pins IN2N, IN2P, IN3N, IN3P, RLDIN/RSDREF should be tied to AVDD. 

    Un-used RLD output pins RLDOUT, RLDINV can be left to float or tied to GND through a small resistor. Make sure to disable the RLD buffer to save power. 

    Un-used GPIO pins GPIO1, GPIO2 can be tied to GND. 

  • 0 in reply to Alexander Smith
    TI__Expert 4370 points

    Hi Alex,

     

    Thank you for your prompt reply.

     

    1. RLDINV is described as input pin in the datasheet.

    Should RLDINV be tied to AVDD ?

     

    1. Only IN1P / IN1N will be used. Could PGA2N/PGA2P be open ?

     

    1. Customer will use internal clock and will not connect to another component using it.
      In the case of the above, can CLK pin be open ?

     

    Thank you and best regards,

    Michiaki

  • 0 in reply to Michiaki Tanii
    TI__Mastermind 47755 points

    Hi Tanii-san,

    Since the RLD buffer will be powered down, RLDINV can be tied to GND through a weak resistor (~10kOhm).

    Leaving PGA2N/P open should be fine as long as the amplifier is powered down and not used. 

    Please see Table 3. CLKSEL Pin and CLK_EN Bit, depending on register configuration, the CLK pin can be in a 3-state configuration, in which case, leaving it open will be fine.