• LTC4151 - Current Measurement Discrepancy


    We are using LTC4151HMS#TRPBF and LTC4151IMS-1#PBF with a 0.02 ohm shunt and the reading we are getting on current does not match the load current.

    See below current discrepancy between measured and reported from I2C. The voltage values are accurate…

  • RE: Read voltage from LTC4151 IC

    Greetings LR237,

       If I'm reading this correctly, it sounds as though you are reading the correct and expected value from the LTC4151.  You are then wanting to write this to a separate register in another device.  I do not see where the following is…

  • LTC4151 UL recognised


    We are using LTC4151 in our design. I would like to know whether this component is UL recognised or not. If not recognised then please suggest the component which is UL recognised

    Thanks & Regards,


  • LTC4151 problems with internal address pointer(when BYTE R/W)

    Hi everybody!

    Please help in my case

    Ive triying to establish valid data reading from LTC4151

    At first I decided to R/W in TEST MODE

    So I do the following!

    - 1 Set 7 bit address, 80 kHz bit rate
    - Store to control register 0x10 to set up TEST UP
    - Store…

  • Question of LTC4151 (I2C Isolation)

    Customers want to use LTC4151HDD#PBF or LTC4151HMS#PBF (Max 125 degrees).

    However, it is labeled LTC4151-1 in Figure 9.
    Please check if the same can be used for LTC4151HDD#PBF or LTC4151HMS#PBF.

    Figure 9.Opto-Isolation of the I2C Interface Between LTC4151…

  • LTC4151's measurement accuracy


    My customer considers using the LTC4151 to monitor voltage and current of a remote module.

    Could you please provide voltage and current measurment accuracy of the LTC4151 ?

    The customer's goal accuracy is:

        Voltage +/- 1%  /  Current +/- 3%

  • LTC4151 voltage register read

    I performed a read operation on voltage register (0x02 - data word). 

    1. The operating voltage is 28V

    Firstly, The register is reading (0x4480) = 27.4V

    2. Secondly, i tried reading the data from an external register , and it is giving out (0x904D) = 57…

  • LTC4151 Returning 0x000 on SENSE at higher currents.

     My setup is identical to the top figure on page 14 in the LTC4151 data-sheet (rev F)


    • 0.04 Ohm shunt
    • 24V in.

    A microcontroller poll the LTC4151 at ~1Hz. The LTC4151 is in its default boot-up Scanning mode.

    Everything works fine at lower currents…

  • Current and voltage computation formula for LTC4151

    In the datasheet of LTC4151, there is no trace of how current and voltage computation can be done. There is only temperature measure calculation but not current or voltage.

    Could you please provide the current and voltage computation formula for the same…

  • RE: read data by sense registers

    Greetings LR237,

       Can you provide a scope shot of the I2C transaction?  Its hard to say what's going on exactly without being able to see more details.  There are a few things you can try:

    1.  Try to read the sense register using the read word protocol…