AD82178 datasheet(21/90 Pages) ESMT

21 / 90 page

ESMT

AD82178

Elite Semiconductor Microelectronics Technology Inc.

Publication Date: Jul. 2024

Revision: 1.3

21/90

finished, AD82178 will turn off the power stages, clock signals (for digital circuits) and current (for analog

circuits). After PD pin is pulled low, AD82178 requires Tfade to finish the forementioned work before entering

power down state. User can not program AD82178 during power down state. Also, all settings in the

registers will remain intact unless DVDD is removed.

If the PD signal is removed during the fade-out procedure (above, right figure), AD82178 will still execute the

fade-in procedure. In addition, AD82178

will establish the analog circuits’ bias current and send the clock

signals to digital circuits. Afterwards, AD82178 will return to its normal status.

 Self-protection circuits

AD82178 has built-in protection circuits including thermal, short-circuit, under-voltage detection, and over

voltage circuits.

(i) When the internal junction temperature is higher than 160℃, power stages will be turned off and

AD82178 will return to normal operation once the temperature drops to 125℃. The temperature values

may vary around 10%.

(ii) The short-circuit protection circuit protects the output stage when the wires connected to loudspeakers

are shorted to each other or GND/VDD. For normal 24V operations, the current flowing through the

power stage will be less than 8A

for stereo configuration. Otherwise, the short-circuit detectors may pull

the ERROR pin to DGND, disabling the output stages. When the over-temperature or short-circuit

condition occurs, the open-drain ERROR pin will be pulled low and latched into ERROR state.

Once short-circuit condition is removed, AD82178 will exit ERROR state when one of the following

conditions is met: (1) PD pin is pulled low, (2) Master mute is enabled through the I

2C interface.

(iii) Once the DVDD voltage is lower than 1.35V when address0x00 B[1] = 0, AD82178 will turn off its

loudspeaker power stages and reset. When DVDD becomes higher than 1.5V, AD82178 will return to

normal operation.

(iv) Once the PVDD voltage is higher than 29.5V, AD82178 will turn off its loudspeaker power stages. When

PVDD becomes lower than 28.5V, AD82178 will return to normal operation.

(v) Once the PVDD voltage is lower than 3.8V when address0x1B B[2:0] = 000, AD82178 will turn off its

loudspeaker power stages. When PVDD becomes higher than 4.2V, AD82178 will return to normal

operation.

AD82178 Datasheet(PDF) 21 Page - Elite Semiconductor Memory Technology Inc.