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TAS5760LDAPR Datasheet(PDF) 26 Page - Texas Instruments |
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TAS5760LDAPR Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 77 page  TAS5760L SLOS782B – JULY 2013 – REVISED SEPTEMBER 2015 www.ti.com Feature Description (continued) For non-latching errors, the device will automatically resume normal operation (that is playback) once the error has been cleared. The non-latching errors, with the exception of clock errors will not cause the SPK_FAULT line to be pulled LOW. It is not necessary to toggle the SPK_SD pin or bit in order to clear the error and resume normal operation for non-latching errors. Table 1 details the types of errors protected by the TAS5760L's Protection Suite and how each are handled. 9.3.3.1 Speaker Amplifier Fault Notification (SPK_FAULT Pin) In both hardware and Software Control mode, the SPK_FAULT pin of the TAS5760L serves as a fault indicator to notify the system that a fault has occurred with the speaker amplifier by being actively pulled LOW. This pin is an open-drain output pin and, unless one is provided internal to the receiver, requires an external pullup to set the net to a known value. The behavior of this pin varies based upon the type of error which has occurred. In the case of a latching error, the fault line will remain LOW until such time that the TAS5760L has resumed normal operation (that is the SPK_SD pin has been toggled and TSPK_FAULT has passed). With the exception of clock errors, non-latching errors will not cause the SPK_FAULT pin to be pulled LOW. Once a non-latching error has been cleared, normal operation will resume. For clocking errors, the SPK_FAULT line will be pulled LOW, but upon clearing of the clock error normal operation will resume automatically, that is, with no TSPK_FAULT delay. One method which can be used to convert a latching error into an auto-recovered, non-latching error is to connect the SPK_FAULT pin to the SPK_SD pin. In this way, a fault condition will automatically toggle the SPK_SD pin when the SPK_FAULT pin goes LOW and returns HIGH after the TSPK_FAULT period has passed. Table 1. Protection Suite Error Handling Summary ERROR CAUSE FAULT TYPE ERROR IS CLEARED BY: Non-Latching Overvoltage Error PVDD level rises above that specified by (SPK_FAULT PVDD level returning below OVETHRES(PVDD) (OVE) OVERTHRES(PVDD) Pin is not pulled LOW) Non-Latching Undervoltage Error PVDD voltage level drops below that (SPK_FAULT PVDD level returning above UVETHRES(PVDD) (UVE) specified by UVEFTHRES(SPK) Pin is not pulled LOW) One or more of the following errors has occured: Non-Latching 1. Non-Supported MCLK to LRCK Clock Error (SPK_FAULT Clocks returning to valid state and/or SCLK to LRCK Ratio (CLKE) Pin is pulled LOW) 2. Non-Supported MCLK or LRCK rate 3. MCLK, SCLK, or LRCK has stopped Speaker Amplifier output current has Overcurrent Error TSPK_FAULT has passed AND SPK_SD Pin or Bit increased above the level specified by Latching (OCE) Toggle OCETHRES DC offset voltage on the speaker DC Detect Error TSPK_FAULT has passed AND SPK_SD Pin or Bit amplifier output has increased above the Latching (DCE) Toggle level specified by the DCETHRES TSPK_FAULT has passed AND SPK_SD Pin or Bit The temperature of the die has increased Overtemperature Error Toggle AND the temperature of the device has above the level specified by the Latching (OTE) reached a level below that which is dictated by the OTETHRES OTEHYST specification 9.3.3.2 DC Detect Protection The TAS5760L has circuitry which will protect the speakers from DC current which might occur due to an internal amplifier error. The device behavior in response to a DCE event is detailed in the table in the previous section. A DCE event occurs when the output differential duty-cycle of either channel exceeds 60% for more than 420 msec at the same polarity. The table below shows some examples of the typical DCE Protection threshold for several values of the supply voltage. This feature protects the speaker from large DC currents or AC currents less than 2 Hz. 26 Submit Documentation Feedback Copyright © 2013–2015, Texas Instruments Incorporated Product Folder Links: TAS5760L |
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