CS43130 datasheet(34/137 Pages) CIRRUS

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DS1073F1

CS43130

4.5 Headphone Presence Detect and Output Load Detection

the sense pin is shorted to the output signal and, therefore, is pulled below a certain threshold via the output stage of the

HP amp. Thus, a low level at the sense pin indicates plug inserted, and a high level at the sense pin indicates plug

removed.

4.5.1.3 Headphone Detect Registers

This section describes the behavior and interaction of the headphone-detect debounce register fields. See Fig. 4-10 for

reference.

Figure 4-10. Headphone Detect Block Diagram

• HPDETECT_CTRL configures the operation of the HP detect circuit.

• HPDETECT_INV inverts the signal from the HP detect circuit.

• HPDETECT_FALL_DBC_TIME configures the HP_DETECT falling debounce time.

• HPDETECT_RISE_DBC_TIME configures the HP_DETECT rising debounce time.

• HPDETECT_PLUG_DBC shows the falling-edge-debounced version of HP_DETECT signal.

• HPDETECT_UNPLUG_DBC shows the rising-edge-debounced version of HP_DETECT signal.

• HPDETECT_PLUG_INT shows the headphone plug-in event status.

• HPDETECT_UNPLUG_INT shows the headphone unplug event status.

• HPDETECT_PLUG_INT_MASK is the interrupt mask of headphone plug-in event status.

• HPDETECT_UNPLUG_INT_MASK is the interrupt mask of headphone unplug event status.

4.5.1.4 Headphone Detect and Interrupts Setup Instructions

The following steps are required for activation of headphone-detect debounce interrupt status:

1. Ensure the I2C is ready to respond to control port command.

2. Clear the interrupt masks.

3. Write to HPDETECT_RISE_DBC_TIME and HPDETECT_FALL_DBC_TIME (see p. 112) to enable debounce for

presence detect plug/unplug.

4. Set HPDETECT_CTRL to 11 to enable the HPDETECT functions.

The interrupt status bits can be found in Section 7.6.1. The status does not contain an event-capture latch (a read always

yields the current condition).

HP_DETECT

HP Detect Block

Delay

HP Detect

Plug/Unplug

Detect

HP Detect

Plug/Unplug Interrupt

Mask

HP Detect

Plug/Unplug Interrupt

Status

Interrupt Handler Block

INT

Read

Deasserts INT

FALL_DEBOUNCE

RISE DEBOUNCE

Delay

HP Detect

Debounced Status

HPDETECT_CTRL p. 112

HPDETECT_PLUG_INT

p. 115

HPDETECT_UNPLUG_

INT p. 115

HPDETECT_RISE_DBC_TIME p. 112

HPDETECT_FALL_DBC_TIME p. 112

HPDETECT_INV

p. 112

HPDETECT_PLUG_DBC p. 112

HPDETECT_UNPLUG_DBC

p. 113

HPDETECT_PLUG_INT_

MASK p. 117

HPDETECT_UNPLUG_

INT_MASK p. 118

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