WM8595 datasheet(49/82 Pages) WOLFSON

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Production Data

WM8595

PD, Rev 4.2, January 2011

EMERGENCY POWER DOWN

In the event of sudden power failure in a system, or any other emergency condition, the

SHUTDOWN

¯¯¯¯¯¯¯¯¯¯¯ pin may be used to power the device down from any state in a controlled manner.

This may be useful in a system where there is no guarantee the power supplies will be available long

enough to complete the recommended power down sequence using software writes.

When the SHUTDOWN

¯¯¯¯¯¯¯¯¯¯¯ is pulled low, the device will mute and then power down the outputs quietly.

If the WM8595 is still receiving clocks, the outputs will be softmuted. If the clocks have stopped, the

outputs will be muted immediately. Figure 23 shows the operation of SHUTDOWN

¯¯¯¯¯¯¯¯¯¯¯ and the effect

on the outputs of the device:

Figure 23 SHUTDOWN

¯¯¯¯¯¯¯¯¯¯¯ Operation

It is expected that power is removed from the device before the device is used again, forcing the

device to be reset via the POR. If this is not the case, the device must be manually reset by the

customer (either by a software or hardware reset) once the SHUTDOWN

¯¯¯¯¯¯¯¯¯¯¯ is pulled high again.

WM8595 데이터시트(PDF) 49 Page - Wolfson Microelectronics plc