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which ic is best for connect multiple 4 wire load cell

surya
Expert 2395 points
Other Parts Discussed in Thread: ADS122C04, TM4C123GH6PM, CC1310, CC1350

Dear Ti,

i want to connect 4 load cell with one A/D Converter, can you please suggest any ic for connect 4 load cells and get average value through i2c. 

load cell detail:   kg- 80,  4- wire (red, black green, white)

thank you 

  • 0
    TI__Guru 55342 points
    Hi Natesh,

    Sorry for the delay in response.

    What level of resolution are you looking for?
    How often will you be measuring from each other the load cells - what kind of sample rate do you need?

    www.ti.com/.../products.html
  • 0 in reply to Alexander Smith
    TI__Guru** 113765 points
    Hi Natesh,

    An additional question I have is do you want to connected the four load cells in parallel and take a single reading? Or do you want to take four individual load cell measurements?

    I will assume that you want to have a four point measurement similar to a platform scale and get the average result from the four load cells in parallel. You could do this with the ADS122C04. The typical load cell is a resistive bridge measurement and there is an application example in section 9.2.3 of the ADS122C04 datasheet on page 59. In your application you would need to place the 4 load cells in parallel.

    If you need to measure the four load cells independently, then we do not have a good single chip I2C solution. However, you could use 2 ADS122C04 devices with each ADS122C04 connecting to 2 load cells. For example one load cell could connect to AIN0/AIN1 and the 2nd load cell to the AIN2/AIN3 inputs.

    Best regards,
    Bob B
  • 0 in reply to Alexander Smith
    Expert 2395 points

    Dear Alexander Smith,

    thanks for your reply, now i am using HX711 24 bit ADC IC with TM4C123GH6PM  for get weight, but that is working method is different that is dont' have i2c communication. so i want ADC ic with i2c communication, and one thing i will update my design with cc1350 or cc1310 for sub 1 ghz wireless communication option. so please suggest the amplifier for best on my cc1350 or cc1310 microcontrollers. my weighing scale is have cost limitation so please suggest best ic with low cost.

    thank you

  • 0 in reply to Bob Benjamin
    Expert 2395 points
    Dear Bob,
    thanks for your attention on my question, i was working with only one load cell (Bar type) with hx711 24 bit ADC ic, that's why i ask this question. i don't know if i connect the 4 load cells on parallel what is result comes. if you said load cell parallel connection with single ic is working fine that's good for me because that's reduce my device cost.

    thank you
  • 0 in reply to surya
    TI__Guru 55342 points
    Hi Natesh,

    Happy to help!
    I don't work in the amplifier group so I don't feel confident in suggesting an amplifier for you. Once your ADC has been selected, try posting to the amplifier E2E forum and they will help you select an ic.
  • 0 in reply to Alexander Smith
    Expert 2395 points
    Dear Smith,
    thanks for your answer, i will create a new question to amplifier forum.