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TAS2505-Q1: short and open load diagnostic questions

Sherry Liang
Genius 10255 points
Part Number: TAS2505-Q1
Other Parts Discussed in Thread: TAS2505

Dear team,

1. When my customer did "Short to Ground" & "Short to power" test , they can read back D1=1, but they can't read back D1=1 when they short between SPKP pin and SPKM pin. Is there any wrong with the operation?

2. When they test open load diagnostic, do we need to disable our device firstly? Because the SPKM always output square wave even though open load fault occurs. Could you please tell me the mechanism of detection? How to compute the 1.2V? Is there any difference if the disconnect happens TP1 and TP2?

Thanks & Best Regards,

Sherry

  • 0
    TI__Guru* 84915 points

    Hi, Sherry,

    1) During the short event, is the customer still seeing an output from any of the SPK outputs? Once the protection is enabled, the output is automatically disabled and the speaker power driver is set at '0'. Additionally, when the customer removes the short, does he see a change on the page 1 / register 45 / bit D1?

    2) Yes, in order to perform the open load diagnostics, the customer needs to be muted. Otherwise, the detection circuit won't work properly.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Genius 10255 points

    Hi Luis,

    2) When muting the amplifier, the speaker output should be disabled, right? The output should have no waveform, right? Page 1/register46 and page 1/register48 are both speaker volume control, and they both have mute choice, what is the difference between this two mute choices? If I detect open load, should I choose which register?

    3) I don't know why the resistor divider is 1.2V when there is no fault. If the SPKVDD=5V, then the  resistor divider should be 2.38V rater than 1.2V.

  • 0 in reply to Sherry Liang
    TI__Guru* 84915 points

    Hi, Sherry,

    1) I recommend to use page 1 / register 48. It's true that  page 1 / register 46 can be used to mute the device too, but the output will still be active in this case.

    2) Your calculation is correct. I think this value was calculated with the minimum SPKVDD value that the TAS2505 can support (~2.7V). You should get a higher voltage with a SPKVDD level of 5V.

    Best regards,
    Luis Fernando Rodríguez S.