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LDC1312: Position sensing with LDC1312

Hao Wang14
Expert 4415 points
Part Number: LDC1312
Other Parts Discussed in Thread: LDC1101

Hi Team,

LDC1312 will be used to sense the position between sensor and metal target. The system requirements are:

1. Distance resolution is 10um.

2. Maximum distance is 2mm.

3. Sample rate for each channel is 10kHz.

My questions are:

1. Can LDC1312 meet the all the requirements?

2.  The maximum channel sample rate is 13.3ksps in the datasheet, however, customer cannot get such high sample rate on their own board. Is there any attention should be paid to achieve 13.3ksps or is there any document about the design?

3. Is there any risk by increasing I2C clock frequency? Because customer tried to use 1MHz clock frequency and found it can still work.

4.  Do we have any solution which can achieve 10ksps for each channel? Because only one channel of LDC1312 can achieve 10ksps, the two channels cannot achieve 10ksps simultaneously.

5. Is there any other sensor or technology can meet the system requirements except inductive sensing technology?

Thanks and Best Regards!

Hao

  • 0
    TI__Genius 17440 points

    Hello Hao,

    The LDC1312 cannot support 10ksps per channel, because the maximum sample rate for single channel continuous conversion is 13ksps. For two actively measured channels, the maximum sample rate is 6.65ksps per channel. Also please note that 10um resolution may be challenging for such a high sample rate. This depends on the target design, sensor design, and the noise floor.

    Yes, you should not operate the SCL frequency higher than the datasheet specified maximum of 400kHz.

    The LDC1101 is single channel, but it can support up to 180ksps. This is primarily because it uses SPI instead of I2C. Your customer could use two LDC1101s to achieve 10ksps per channel. No other LDC device can support this sample rate.

    I am not sure what kind of resolution optical sensing can achieve, but this might be an option. You would need to post a new e2e question because these parts are supported by a different product line.

    Best Regards,