CS43130 datasheet(85/137 Pages) CIRRUS

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DS1073F1

CS43130

5.11 Headphone Load Measurement

5.11.2 Measuring DC Impedance

Fig. 5-3 shows and Ex. 5-21 describes the steps necessary for measuring DC impedance with the following assumptions:

• The CS43130 is already powered up and out of reset.

• MCLK_INT is 22.5792 or 24.576 MHz sourced from MCLK/XTAL or PLL (MCLK_SRC_SEL = 00 or 01).

• HP_IN_EN = 0 and HPLOAD_EN = 0.

• A headphone is already plugged in and HPDETECT_PLUG_INT = 1.

Figure 5-3. DC Impedance Measurement Flowchart

Example 5-21. Sequence for DC Impedance Measurement

STEP

TASK

VALUE

DESCRIPTION

1 Enable impedance measurement subsystem. Refer to Ex. 5-20.

Select Channel A

0x10010 = 0x99

0x10026 = 0x0A

0x10027 = 0x93

0x10028 = 0x0A

0x10010 = 0x00

HPLOAD_CHN_SEL = 0 (Channel A)

HPLOAD_DC_START = 0 (Stop)

Enable DC impedance measurement

HPLOAD_DC_START = 1

HPLOAD _DC_DONE_ INT

= 1?

HPLOAD_UNPLUG_INT

= 1?

HPLOAD _OOR_INT

= 1?

Read DC impedance

value from

RL_DC_STAT_0 and

RL_DC_STAT_1

YES

Error Occurred

YES

Assumptions

DAC Response

User Commands

DC Impedance Measurement

AC Impedance Measurement

Disable Impedance Measurement Subsystem

Disable Impedance Measurement

Subsystem

Select Channel B

0x10010 = 0x99

0x10026 = 0x8A

0x10027 = 0x15

0x10028 = 0x06

0x10010 = 0x00

HPLOAD_CHN_SEL = 1 (Channel B)

HPLOAD_DC_START = 0 (Stop)

New

Measurement?

YES

Channel ?

Enable Impedance Measurement

Subsystem has already been run.

HPLOAD_UNPLUG_INT

= 1?

YES

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