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LMP91000 Sensor AFE Register Setting

PIerluigi Rossetti
Intellectual 350 points
Other Parts Discussed in Thread: LMP91000

Hi team I have a customer with a problem on device  LMP91000, He  can't  read or write into registers.

 I think what the Status Register is  0, because in the datasheet pag.14,  is wrote:

STATUS -- Status Register (address 0x00) The status bit is an indication of the LMP91000's power-on status. If its readback is “0”, the LMP91000 is not ready to accept other I2C commands.   

 This Register for Default is = 0, now , how can I set the Status register at 1 ?... 

 

Thank a lot.

Pierluigi Rossetti

  • 0
    TI__Genius 9655 points

    Hello Pierluigi,

    first of all, is the customer connecting the MENB pin to GND ? If he doens't control that pin the LMP91000 doesn't answer.

    Moreover if he wants to write in to the register he has to unlock the device, it means write 0 in the 0x01 register.

    regards,

    Domenico

  • 0 in reply to domenyko
    Prodigy 10 points

    Hello,

    I have the same problem, with this device. MENB is allways connected to GND. It seems that the LMP91000 returns to Status 0 randomly (I am sure it is not random) . There are also times the communication beween the MCU and the LMP91000 works without any problems.
    Can you please tell me, why I have these problems or what brings the device in the status "not ready"?

    With kind regards
    Martin Guenzler

  • 0 in reply to martin.guenzler
    TI__Genius 9655 points

    Hi Martin,

    The value of status register is updated at the Power On of the device, a 0 value in that register means that the device has not been correctly initialized (such as the default register condition has not been correctly loaded).

    Can you please check if the voltage supply is always in the range specified in the DS ? An undervoltage condition could generate a not correct loading of the default values and so you get a 0 in the register status.

    regards,

    Domenico

  • 0 in reply to martin.guenzler
    Prodigy 40 points

    Martin,


    I also have the same problem as yours.

    I know it is for more than a year ago, but I was just wondering if you could figure out the problem?! I have connected MENB to the ground, and the supply voltage is 3 V.

    Many Thanks,

    Somayeh