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TUSB422: no audio detection

Vincenzo Pizzolante
Mastermind 25316 points
Part Number: TUSB422
Other Parts Discussed in Thread: TUSB320

hi all,

a KMM of mine started working with TUSB422 and they have a question.

TUSB422 doesn’t detecting audio accessory, while the TUSB320 does it.

may you help us to understand where is the problem?

what do you need from us to make it happens?

thanks a lot in advance

KR

Vincenzo

 

  • 0
    TI__Mastermind 36085 points
    Hello Vincenzzo,

    The TUSB422 does support Audio accessory, please share the test procedure and the results of the registers 0x18 and 0x29.

    Regards,
    Diego.
  • 0 in reply to Diego Cortes
    TI__Mastermind 25316 points
    hi Diego,

    thanks a lot for the prompt reply.

    This is the procedure applied by customer.

    This is data after reseting IC and conecting audio accessory:
    register 0x29: 0x00
    register 0x18 : 0x60
    state of the other registers didn't change
    UFP mode: if send command Looking4connection and connect audio accessory, nothing was changed.

    if customer changes ROLE to DRP (register 0x1A, value 0x4A) send command Looking4connection (register 0x23, value 0x99) and connect accessory, then CC Status register 0x1D show value 0x05, and the other registers didn't change.

    What is the right sequence to determine audio accessory?

    hope this helps a bit
    thansk a lot in advance
    KR
    Vincenzo
  • 0 in reply to Diego Cortes
    Prodigy 80 points
    Hello,
    This is data after reseting IC and conecting audio accessory:
    register 0x29: 0x00
    register 0x18 : 0x60
    state of other registers else didn't changed
    UFP mode:
    if send command Looking4connection and connect audio accessory,  nothing was changed.

    if I change ROLE to DRP (register 0x1A, value 0x4A) send command Looking4connection (register 0x23, value 0x99) and connect accessory, then CC Status register 0x1D show value 0x05, other registers didn't changed.

    What is the right sequence to determine audio accessory?
    Thanks.

  • 0 in reply to Mihail K
    TI__Mastermind 25316 points
    hi Diego,

    any update on this topic?

    KR
    Vincenzo
  • 0 in reply to Mihail K
    TI__Expert 4325 points

    If you set ROLE to DRP or DFP and set Looking4Connection, then wait for CC status change alert and read the CC status. CC state = 0x05 means Ra was detected on both CC pins which equates to Audio Accessory detection.

    Note that TUSB422 must be controlled via I2C for any operation.  TUSB320 can operate stand-alone with pin strapping only and I2C is optional.
    Regards,
    Brian

  • 0 in reply to Brian Quach
    Prodigy 80 points

    Thank you Brian. With DRP mode everything is clear. But what about UFP mode? Can TUSB422 determine Audio Accessory in UFP?

  • 0
    Prodigy 70 points
    The TUSB422 provides Configuration Channel (CC) logic for determining USB port attach and detach, role detection, cable orientation, and Type-C Current detection/advertisement. The TUSB422 also contains several features such as VCONN sourcing, VBUS enable, VBUS discharge enable, detection of vSafe0V, and low standby current.
  • 0 in reply to Mihail K
    TI__Expert 4325 points
    No, UFP cannot detect audio accessory per USB Type-C industry spec.