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LDC0851EVM: Output of LDC0851EVM

Sayali Shinde
Intellectual 705 points
Part Number: LDC0851EVM
Other Parts Discussed in Thread: LDC0851

Hello Team,

    As per user guide of  LDC0851EVM it does not required MCU or GUI ,and output is high if LS>LR and low when LS<LR .Is it possible to design inductive encoder using this chip with 1024 PPR(pulse per revolution) without any MCU or GUI. If yes then I need only design target PCB by using coil calculation tool ?

Regards,

Sayali

  • 0
    TI__Mastermind 18545 points

    Hello Sayali, 

    Yes this can be done. The TIDA-00828 is a 32 position encoder using the LDC0851. You can follow this reference design and scale it to 1024. Additionally, the LDC Calculator Tool has tabs specifically for the LDC0851 and for encoder design to assist with designing a coil for this type of application. 

    Best Regards, 
    Justin Beigel

  • 0 in reply to Justin Beigel
    Intellectual 705 points

    Hello Justin,

       Sorry for late reply. Have a few queries relate to target PCB

    1. If we design target PCB with more layers like 4 ,6,8,10 so on then the coil on 10th  layer will have less inductance and even this layer is far from sensor PCB as compare to 1 or 2 layer. if we increase number of layers does it will have any impact performance.

    2. what is maximum layer we can design for inductive encoder.

    3. Is inductive encoder is only applicable for out rotor BLDC motor?

    Regards,

    Sayali

  • 0 in reply to Sayali Shinde
    TI__Mastermind 18545 points

    Hello Sayali, 

    1. Additional layers in a coil design do add to the magnetic field produced by the coil but every additional layer will have a diminished return. See the "Multiple Layers" section of the Sensor Design for Inductive Sensing Applications Using LDC (Rev. C) for more information on creating a sensor with multiple layers. 
    2. There is no maximum number of layers, but you will want to make sure that your coil design still fits within the spec for the LDC device you are using. Having more layers, your Rp will need to be kept in mind while designing the coil. 
    3. I am not sure what you mean by this question. Are you asking about other approaches for encoding for your motor? 
      1. If so, what is the RPM requirement for your motor? 

    Best Regards, 

    Justin Beigel

  • 0 in reply to Justin Beigel
    Intellectual 705 points

    Hello Justin,

            Thanks for providing for answers to above queries .For the 3rd point my question ,is there any limitation of using inductive encoder on specific motors like it can be use only or flat motor or any type of motor .

    And yes can this encoder support motor speed greater than 50k rpm, coz our BLDC motor offers very high speed.

    Regards,

    Sayali

  • 0 in reply to Sayali Shinde
    TI__Mastermind 18545 points

    Hello Sayali, 

    The type of motor isn't a problem, but you will want to consider your rpm against the sample rate and positions per rotation that you are detecting. 

    If the RPM does not work for LDC, an alternative to LDC is using Hall-effect sensors as seen in the Incremental Rotary Encoders tech note. 

    Best Regards, 
    Justin Beigel