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MSP430FR5969-SP: What is the Maximum GPIO Output Current?

JDJ
Expert 5256 points

Part Number: MSP430FR5969-SP

Hello, 

What is the maximum output current for a GPIO pin? 

My application is having the MSP430 output a pwm of 3.3V at a fixed duty cycle of 65% to the gate of a boost. Currently I need 10.4mA but can reduce or increase this if necessary. 

Thanks,

Jack

  • 0
    Guru 26175 points

    To a good first approximation, the outputs look like resistors. The more current you pull the greater the voltage drop. The data sheet shows a drop of 0.6V at 6mA so you can expect around 1V at your desired current. Is 2.3V sufficient? For anything other than a simple load, a SPICE simulation might be in order.

  • 0
    TI__Mastermind 49692 points

    Hi Jack,

    David's exactly right about the higher voltage drop for higher output currents. For all I/O's combined, you don't want to exceed 100 mA. Your scenario of 10.4 mA isn't too much current, but as David mentioned, the voltage output level won't be equal to VCC. Perhaps you can use the output between an external pull-up resistor to VCC with an external FET to GND to control the gate of the boost and reduce the current flow even more.

    Regards,

    James

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