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DAC530A2W: Pull up on MISO pin?

Alberto Perez
Prodigy 10 points
Part Number: DAC530A2W
Other Parts Discussed in Thread: DAC532A3W

Tool/software:

Hi, 

I will use the DAC532A3W on a very small board using the SPI protocol. Since I don't have lot of space available on the PCB, I would like to remove all unnecessary components. While reading the DAC datasheet, I saw that PIN A4 GPIO/SDO (MISO on the SPI mode) has to have an external pullup resistor:

Since it is unusual to use pull ups for an SPI communication, I was wandering if it is really necessary if the IC is used in the SPI mode?

Is this PIN an open drain GPIO regardless of it communication protocol? 

Best regards,

Alberto Perez

  • +1
    TI__Mastermind 42043 points

    Hi Alberto, 

    The pullup is required if you want to read using the MISO pin. The pin is open drain and won't toggle without a pullup. If you only need to write, or your MCU can be configured to use an internal pullup, then you can omit the pullup. 

    Best,

    Katlynne Jones