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LMX2595EVM: SPI Write Speed

Callum Austin
Prodigy 150 points
Part Number: LMX2595EVM

Hi, I'm using a Arduino Nano to program the LMX2595EVM. I've managed to get it programmed at a 2MHz SPI clock frequency. However, my application requires this to be faster and therefore I am looking to use a 4MHz SPI clock frequency. This does not work. I'm certain the Arduino sends out the data as I have looked on a logic analyzer.   

  • 0
    TI__Guru** 107300 points

    Hi Callum,

    The SPI interface in the EVM has a 12kΩ series resistor on each pin, this resistor + stray capacitance will filter out the CS* signal when SPI clock freq is high. 

    Change these resistors to a smaller value, say 33Ω should resolve the problem.