• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 206 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TAC5311-Q1: VBAT_IN and MICBIAS

Lawrence He
Genius 3115 points
Part Number: TAC5311-Q1


Hi, Support Team

We saw the datasheet 6.3.7.1.6 have some question

6.3.7.1.6 Input Pin Short to VBAT_IN
A short to VBAT_IN fault occurs when the difference between the voltage measured for the VBAT_IN pin and the
input pin, ABS(VBAT_IN – INxx), is less than the threshold or both the VBAT_IN and INxx pin measured voltages
are above 11.7V. The threshold can be set by configuring DIAG_SHT_VBAT_IN, P1_R71_D[3:0].
When VBAT_IN is less than MICBIAS, false fault detections can exist based on the signal level of the INxx
pin. To minimize false detections there is also a separate debounce count for this condition set by configuring
VSHORT_DBNCE, P1_R74_D1.

---------------------------------------------------------------------------------------------------------------------------------------------------------

if VBAT_IN voltage is setting 8V and MICBIAS also is 8V, The Codec could possible easy occurs fail?

have any side effect

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Mastermind 27670 points

    Hi Lawrence,

    The device measures the voltage at the pin for MICBIAS, INx, and VBAT. The voltage at the analog input pin will not be the same as VBAT or MICBIAS unless a short-circuit occurred. VBAT and MICBIAS will have a nominal voltage, but INx will have a lower rating due to the voltage drop across the bias resistor.

    In addition, in a real use-case scenario MICBIAS and VBAT will not be exactly the same either. You can toggle the short to VBAT (register 0x65) threshold and short to MICBIAS (register 0x66) threshold to 0mV to ensure that the INx pin must be EXACTLY the same value as the supply.

    Regards,