• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 47 subscribers
  • Views 222 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

Serial connection of some current sensors

MYKHAILO KOLOMIIETS
Prodigy 60 points
Other Parts Discussed in Thread: INA226

Hi

Could I connect some INA226 in series like show on the schema.
It is no matter either with lower or upper connection of shunt.

Thank you.

  • 0
    TI__Mastermind 26335 points

    Hello MYKHAILO,

    Thanks for considering to use Texas Instruments.  What you are proposing to do is possible assuming (VIN+)-GND is below 40V in all conditions (besides esd events) and below 36V for the intended measurement range. Your minimum current resolution neglecting noise will be 2.5uV/0.01ohm= 250uA.  However, at this level there may be significant error from the input bias current (ib/isense*100).  Your maximum allowable current range would be 81.92mV/0.01ohm=8.192A.

  • 0 in reply to Patrick Simmons
    Prodigy 60 points

    Hi
    Patrick, thanks alot for your answer!

    I've cared about maximum voltage - in my case it shouldn't exceed 15 V (four LiFePO4 in series & voltage drop on shunts and wires at maximum current).
    My requirements in minimal current is tens milliamps, so input bias current shouldn't have valuable influence too. Also there is posible to correct it with constant value at calculation phase in software.

    The main doubt was related to posibility of stacked connection of current sensors inputs in general.
    So I'll try)

    Thank you again! Have nice day!