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Forum Post: RE: SPI INTERFACE IN LM98722

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Hi Gokul, Please make sure you are waiting at least 50ms or longer, if not already? From page 86: "After either starting or stopping INCLK, or after Software Reset (Register Page 0, Address 1, [4:3]), users should wait for 50 ms to allow the internal PLL and logic to stabilize before resuming Serial Interface communications." If it never works after a long delay (1s or more) then it may be an issue with the oscillator circuit you may have. Please post your schematics and layout information showing the crystal oscillator circuitry and LM98722 . These circuits are very sensitive to loading on the two connections, especially the XTAL in (INCLK+ pin). Regards, Hooman

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