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AFE4490: SPISTE stays high

aurelio carella
Prodigy 10 points
Part Number: AFE4490

Hello everyone,

i'm using this protocentral board https://www.protocentral.com/sensors/1112-protocentral-afe4490-pulse-oximeter-breakout-board-kit-642078949425.html attached to a raspberry pi.

Sometimes, i cant explain why, the SPISTE pin stays HIGH even if i correctly initialize the SPI peripheral.

I even tried to force to SPISTE LOW by clearing the gpio without any results.

is there a reason for the AFE4490 to keep the SPISTE HIGH? Maybe some diagnostic issue that prevent the pin to be set low?

Thanks in advance

  • 0
    TI__Mastermind 49956 points
    Hi Aurelio,

    The SPISTE signal is an input signal to AFE4490 and the AFE does not control the SPISTE signal level.
    Have you checked the status of the RESET, AFE_PDN signals?
    Also have you tried driving a logic low signal on the ARD_CS0 externally on the hardware (U1 pin 15) and check if SPI_CS0 is going low?