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Query regarding External pull up and pull down needed with DSP C6713

Maheen Islam
Intellectual 580 points

HI 

I am having problem in understanding whether external pull up and pull downs are needed with pins of DSP. As it is mentioned in DSP C6713 device datasheet for various pins that they have IPD(internal pull down) and IPU(internal pull up). I wanted to know with what pins are we supposed to connect external pull up and pull down. 

Thank you.

Maheen

  • 0
    Intellectual 330 points

    Off course you can setting up pull up or pull down in your DSP and it probably work correctly (you can test it by resistance load and voltmeter). Usually in microcontrollers internal pull up or pull down resistors are estimated 20-50kOhms (you can check it in datasheet). This value can be too high for your design. So whether external pull up and pull downs are needed with pins of DSP depends of your project (especially you have to know load resistance). For example if you using I2C you have to connect external pull up, because internal pull up is too high and with such resistor you can't reach high bitrates (problems with charging capacity of SDA and SCL - too high time constant and too high rise and fall time).

  • 0
    TI__Expert 4760 points

    Maheen,

    Please refer the Terminal function in the datasheet for the external Pull Up and Pull down requirements.

    http://www.ti.com/lit/ds/symlink/tms320c6713b.pdf

    Sometimes we required external pull Up/down resistor in order to override the internal pull Up/down.

    Regards

    Antony