ZHCSIM2D June 2010 – August 2021 PCM9211
PRODUCTION DATA
By using both the S/PDIF lock status on INT0 and the analog level detect output on INT1, a system controller can place the rest of the system to sleep (such as the Class D amplifier stage, etc). Upon S/PDIF lock, or an ADC input that is above the preset threshold, the controller can wake up and wake up the rest of the system.
In most implementations, it is suggested that as the system goes into standby, only INT1 be used for the ADC level detect function. (that is, mask all other INT1 sources). In addition, it is recommended that this function be implemented one second after startup, in order to allow the internal high-pass filter to settle.
Using such a system allows auto-shutdown, provided that the source moves into its own standby mode (for example, a TV or a set-top box).