CS43130 datasheet(83/137 Pages) CIRRUS

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DS1073F1

CS43130

5.11 Headphone Load Measurement

5.11.1 Enabling the Impedance Measurement Subsystem

Fig. 5-2 shows and Ex. 5-20 describes the steps necessary for enabling the impedance measurement subsystem.

Figure 5-2. Enabling the Impedance Measurement Subsystem Flowchart

Example 5-20. Sequence for Enabling the Impedance Measurement Subsystem

STEP

TASK

VALUE

DESCRIPTION

1 If PDN_HP = 1, go to Step 3.

2 Power down headphone output. See headphone power down sequence in Section 5.7, “Headphone Power Down Sequences.”

3 Measure headphone DC impedance

Enable Impedance Measurement

Subsystem

Device is powered up and out of reset.

MCLK_SRC_SEL = 00 or 01 (MCLK/XTAL or PLL)

HP_IN_EN = 0 (HPIN disabled)

HPDETECT_PLUG_INT = 1 (Headphone present )

HPLOAD _EN = 0 (Impedance measurement sub-system is turned off)

PDN_HP = 1

Perform Headphone Power

Down Sequence

Enable HPLOAD Interrupts

HPLOAD _NO_DC_INT_MASK= 0

HPLOAD_UNPLUG_INT_MASK = 0

HPLOAD_OOR _INT_MASK = 0

HPLOAD_DC_DONE_INT_MASK = 0

HPLOAD_AC_ DONE_INT_MASK = 0

HPLOAD_ OFF_INT_MASK = 0

HPLOAD _ON_INT_MASK = 0

YES

Enable Impedance Measurement

Sub-System

HPLOAD_EN = 1

HPLOAD_ AC_ START = 0

HPLOAD_DC_START = 0

Read Interrupt Status 4

Enable calibration

0x10010 = 0x99

0x80024 = 0xBB

0x1002C = 0x01

0x10027 = 0x95

0x10028 = 0x0B

0x100010 = 0x00

HPLOAD_ON_INT

= 1 ?

YES

DC Impedance Measurement

AC Impedance Measurement

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