• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 821 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PCM9211: pcm9211 reset not work

user6229347
Prodigy 30 points
Part Number: PCM9211

Reset does not work when mode pin is grounded or VDD is connected. Reset can work normally when mode pin is suspended.

Rst pin directly connected to VDD or manually reset cannot work normally, and main output has no output.

  • 0
    TI__Mastermind 23050 points

    Hi,

    Can you share your intended configuration and a schematic? Here are some rules to keep in mind regarding the reset:

    1) "When only the onboard POR is to be used, the RST pin should be connected to VDD directly. An external pull-up resistor should not be used, because the RST pin has an internal pull-down resistor (typ 50 kΩ). If an external resistor is used, then the reset is not released."

    2) "If synchronization is maintained among SCKI, BCK, and LRCK, the DOUT from the ADC is enabled and a fadein begins tADCDLY1 = 2048/fS after the internal reset is released. DOUT then starts to output data corresponding to VINL and VINR after tADCDLY2 = 1936/fS from the start of fade-in. If synchronization is not maintained, the internal reset is not released, and the ADC is held in reset."

    3) Upon reset, the device will return to the default routing paths shown in figure 33. If you're not supplying the clocks and data on the default lines then this may be why you don't see anything on the output after reset. 

    Best,

    Zak

  • 0 in reply to user6229347
    TI__Mastermind 23050 points

    Hi,

    The mode pin should not be left to float as this means the communication protocol will not be set to a defined state. This should have no bearing on whether or not the device is capable of a reset though. If you are not re-programming the device after a reset, please verify you are inputting your signals on the default signal paths as mentioned above.

    Best,

    Zak

  • 0 in reply to Zak Kaye
    Prodigy 30 points

    Mode pins are connected to jumpers.

    When the mode pin remains floating, the reset is normal, the default route is normal, and the input signal has signal output.

    When the mode pin is connected to GND or VCC, the reset is abnormal, and the default route has no signal output.

    In both States, I2C and SPI cannot establish communication.

  • 0 in reply to user6229347
    TI__Mastermind 23050 points

    Hi,

    I verified the reset behavior on the EVM and can confirm that the device will return to the default register settings after initiating a hardware reset so if you are inputting a signal on RXIN2 you will see an I2S output on the main output. If this is not the case for you then you may have an issue with your jumper settings or signal routing. The mode pin is not allowed to float though and this needs to be tied high or low. It sounds like you could potentially have an issue with your I2C and SPI setup if you are unable to establish communication with the device. 

    Best,

    Zak