wm8595 Wolfson Microelectronics plc, wm8595 Datasheet - Page 49

• Manufacturer Part Number: wm8595
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
EMERGENCY POWER DOWN
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In the event of sudden power failure in a system, or any other emergency condition, the
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
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
on the outputs of the device:
Figure 23 SHUTDOWN
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
SHUTDOWN
¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ pin may be used to power the device down from any state in a controlled manner.
¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ is pulled low, the device will mute and then power down the outputs quietly.
¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ Operation
¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ is pulled high again.
¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ and the effect
PD, Rev 4.1, April 2010
WM8595
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