WM9082

Production Data

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PD, August 2012, Rev 4.1

14

CONDITION

DESCRIPTION

4 x Code 1

Fast start-up for default SPKVDD condition (SPKVDD = 3.6V)

32 x Code 9

Start-up for SPKVDD = 3.6V

32 x Code 10

Start-up for SPKVDD = 5.0V

PDM audio data

Fast start-up

Table 7 WM9082 Start-Up Events

STANDBY EVENTS

The WM9082 Class D output is disabled whenever the PDM input data is interrupted, or when a valid

Standby Control Code is detected. The WM9082 Standby transition is selected during normal

operation (ie. from the “ON” state”) under any of the conditions described in Table 8. Each of these

conditions results in a transition to the “STANDBY” state.

CONDITION

DESCRIPTION

32 x Code 2

Standby command - selects STANDBY state

64 x Any Control Code

Selects STANDBY state

Error condition

Selects STANDBY state

(An error condition is detected if >24 consecutive 1’s or >24

consecutive 0’s is received on the PDM audio interface.)

Table 8 WM9082 Standby Events

Note that repeated instances of any Control Code will not cause more than one state transition until

audio data or a different Control Code has been received. This prevents the WM9082 from cycling

between the “ON” state and the “STANDBY” state in the event of repeated Control Codes.

SHUTDOWN EVENTS

If the CLK input is not present at any time, this results in a transition to the “OFF” state. The WM9082

will remain in the “OFF” state until the CLK input restarts.