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PGA280 GPIO as simple output

Helmut Forren
Mastermind 6805 points

Other Parts Discussed in Thread: PGA280

The PGA280 datasheet doesn't spend enough time describing the use of the GPIO pins as simple outputs.  Nowhere does it describe how to configure and write a simple output.  The closest it comes is a note at the top of the register 5 definition for "Write 0x45".

Is the following true?  In order to make all 7 GPIO pins outputs and then write values to them:
1) Send SPI command and data 0x487F to make them all outputs.
2) Send SPI command and data 0x45NN to send out data values 0xNN to GPIO6:0.  
    (e.g. 0x457F for all ones.  0x4500 for all zeroes.  0x4555 for alternate ones and zeros on GPIO6:0.)

Step 2 is never specified explicitly in the datasheet.  I just want to be sure before designing this part in.

Thanks.

  • 0
    TI__Genius 12375 points

    Helmut,

    You're first step is correct,  it will configure the GPIO pins to outputs by writing all ones to the corresponding bits in register 8. However, I should clarify in your second step that writing a 1 to the corresponding position in register 5 will output a low, 0 will output a high at that pin as described in the GPIO configuration section on page 36.

  • 0 in reply to John Caldwell
    Mastermind 6805 points

    Thanks for the heads up.  I'll watch for that.  (((I read that section and it's still as clear as mud.  It very poorly describes forcing a value in spite of configuring for  /CS function, and doesn't address what happens when you're not doing any forcing.  But I can see it being the same.  So I'll watch for it.  It will be easy enough to test, and easy enough to correct software.)))