Cirrus Logic CDB43131-GBK Manual page 32

5.5.4.2 Disabling Headphone Output
The following steps show how to disable the headphone output using the Headphone tab.
1. If the CS43131 just came out of reset, the headphone output is already disabled, so the remaining steps can be
skipped.
2. Enable headphone interrupts by checking the Enable Headphone Interrupts check box.
3. Uncheck the Enable Headphone Output check box to power down headphone.
4. Click on Read PDN_HP Status button to read the status of PDN_HP bit.
5. If the PDN_HP bit is set, then the Power Down HP Status LED will turn red to indicate headphone has been
powered down.
5.5.4.3 Enabling Analog Audio Passthrough
The following steps show how to enable analog audio passthrough.
1. Connect audio output from a source to the HPIN jack on the CDB43131 board.
2. If the CS43131 is coming out of reset, enable analog audio passthrough by checking the External HP Input check
box. Else, skip to step 3.
3. Disable the headphone output if it is not already disabled.
4. Enable analog audio passthrough by checking the External HP Input check box.
5.5.4.4 Headphone Presence Detection
The following steps show how to enable headphone presence detection.
1. Enable headphone interrupts by checking the Enable Headphone Interrupts check box.
2. Enable invert detection (to account for the tip detect pin setup of the headphone jack) by checking the Invert Detect
check box.
3. Enable headphone presence detection by checking the Enable HP Detect check box.
4. Click on the Read HPDETECT Status button to read status.
5. If a headphone is plugged into the headphone jack, then the Headphone Detected LED will turn green.
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CDB43131-GBK
DS1155V2DB1