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Synchronise 4 LDC1614

Mathieu ROUGEOLLE
Prodigy 25 points
Other Parts Discussed in Thread: LDC1614

Hello,

I need to use 4 LDC in order to mesure on 16 Coils.

I search a way to synchronise my LDC in order to avoid noise between Coils.

If i have 4 LDC1614 ( A / B /C / D) with 4 Channel, i want to start A1 in the same time than B1&C1&D1

A1 A2 A3 A4 B1 B2 B3 B3 C1 C2 C3 C4 D1 D2 D3 D4 

If you have an idea to do this, i'm looking to play with external clk

Best Regards

  • 0
    TI__Expert 8050 points
    Hello Mathieu,

    Here are a few suggestions for minimizing the cross-talk between different coils

    1. Try to arrange the coils such that the ones turning on at the same time are not right next to each other.
    2. Use the same external clock for all LDCs to synchronize them.
    3. Use a larger settle count, i.e. increase the inactive time between different channels, in order to minimize undesired overlap time of different channels.

    Regards,
    Yibo
  • 0 in reply to Yibo Yu
    Prodigy 25 points

    Hello Yibo,

    Thanks for your answer. 

    For 1 : I already do it

    For 2 : It's the fisrt idea, i want also to test with dedicated clock ( same component ) and try too release component with sleep mode I2C commandin the same time.

    For 3 : It's a good Idea

    Regards,

    Mathieu

  • 0 in reply to Yibo Yu
    Prodigy 100 points
    If I well understood the datasheet, the only way to do the synchronisation is to put alternatively each LDC in sleep normal mode and then in sleep mode after 4 conversions (1 on each input).
    The datasheet indicate (p16) that the first conversion start after 16384 Fint clock cycles.
    however Fint is not very accurate.
    Do you confirm the first conversion start after 16384 Fint clock even if we use external clock? (or is it 16384 Fclin cycle in this case?)