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SRC4382 GPO Electrical characteristics

Justin Vis
Prodigy 50 points
Other Parts Discussed in Thread: SRC4382, SRC4392

Hi all,

I am using an SRC4382 as sample rate converter for AES3 and/or S/PDIF. Now I want to use some GPO (GPO1 and GPO3) to show what is happening. 

To do this I have hooked up LED's to each of these pins in sourcing mode (with series resistors).

The LED's are not showing anything, this could have two reasons:

1. The GPO are sinking IO.

2. The GPO cannot supply enough current (LED requires 2mA)

The datasheet of the SRC4382 and the SRC4392 does not say anything about the electrical characteristics of the GPO other than "IO = –4mA" and "IO = 4mA".

I'm not sure how to interpret this info, can anyone clarify this for me? Datasheet page 4 of the SRC4382.

Greetings,

Justin

  • 0
    TI__Mastermind 27990 points
    Hi Justin,

    This means that the GPIO can source up to 4 mA or sink up to 4 mA. What settings do you have for the GPO pins?

    Justin
  • 0 in reply to Justin Bohr
    Prodigy 50 points

    Hi Justin,

    Thank you for the fast response and answering my question.

    I write 0x01 to register 0x1B (GPO1) and also to 0x1D (GPO3) on page 0 via I2C. GPO2 and GPO4 are NC on my board.

    I have found the problem now, the MCLK was floating too high due to a capacitor and another problem was that ICSP was not implemented properly at the PIC. The I2C bus was not functioning properly due to both of these problems.

    Another thank you!

    Greetings,

    Justin