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Thread: tlv493d reading problem

  1. #1
    New Member New Member matthewli is on a distinguished road
    Join Date
    Jul 2019

    tlv493d reading problem

    I read data from tlv493 via i2c bus with xilinx fpga spartan6.
    the setting procedure is:
    for low power mode:
    1. write data (0x00 0x80 0x00 0x60) to address 0xBC;
    2. write data (0x00 0x85 0x00 0x60) to address 0xBC;

    for fast mode:
    1. write data (0x00 0x80 0x00 0x60) to address 0xBC;
    2. write data (0x00 0x86 0x00 0x60) to address 0xBC;

    After mode set, int is produced according power mode, it works well, then I read data follow INT signal after 12us.

    For the data read from sensor, Bx is right all the time,but By and Bz and Temp is wrong sometimes,when it is wrong, the register 2 to 6 are 0xff.

    The other question is that in low power mode FRAM COUNTER is not increment all the time, It even depends on magnetic field intensity, sometimes normal, sometimes abnormal.

    I am totally confused!
    test picture
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    Write to sensor with 4 bytes
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    Read from sensor with 7 bytes
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    Read detals
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  2. #2
    New Member New Member forix is on a distinguished road
    Join Date
    Feb 2012
    Excerpt from data sheet ->
    Managing correct sensor read outs by the C:
    This sensor does not incorporate shadow-buffers for readout. Thus, it is mandatory to read the sensor data
    not during a running conversion to avoid corrupted reads. Ideally, the /INT feature is enabled together with
    the low-power or ultra-low power mode and the C reads the data after the /INT pulse was asserted by the
    sensor. Furthermore, the readout needs to be finished before a new conversion is started and the /INT will be
    asserted again (if the readout is finished 1 ms before a new /INT pulse, this will be sufficient).

    This is the procedure when everything is running well. Please consult the user's manual regarding ADC frame counter hangup -> here
    In case there is something wrong you will need to generate general reset (section 5.7.1).

    Hope this helps.

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