9.3.6 Protection and Monitoring

• Overcurrent Shutdown (OCSD)—The overcurrent shutdown forces the output into Hi-Z. The device asserts the FAULT pin and updates the I²C register.
• DC Detect—This circuit checks for a dc offset continuously during normal operation at the output of the amplifier. If a dc offset occurs, the device asserts the FAULT pin and updates the I²C register. Note that the dc detection threshold follows PVDD changes.
• Overtemperature Shutdown (OTSD)—The device shuts down when the die junction temperature reaches the overtemperature threshold. The device asserts the FAULT pin and updates I²C register. Recovery is automatic when the temperature returns to a safe level.
• Undervoltage (UV)—The undervoltage (UV) protection detects low voltages on PVDD. In the event of an undervoltage condition, the device asserts the FAULT pin and resets the I²C register.
• Power-On Reset (POR)—Power-on reset (POR) occurs when PVDD drops below the POR threshold. A POR event causes the I²C bus to go into a high-impedance state. After recovery from the POR event, the device restarts automatically with default I²C register settings. The I²C is active as long as the device is not in POR.
• Overvoltage (OV) and Load Dump—OV protection detects high voltages on PVDD. If PVDD reaches the overvoltage threshold, the device asserts the FAULT pin and updates the I²C register. The device can withstand 40-V load-dump voltage spikes.
• SpeakerGuard™ Protection Circuitry—This protection circuitry limits the output voltage to the value selected in I²C register 0x03. This value determines both the positive and negative limits. One can use this feature to improve battery life or protect the speaker from exceeding its excursion limits.
• Adjacent-Pin Shorts—The device design is such that shorts between adjacent pins do not cause damage.