STA321 datasheet(74/157 Pages) STMICROELECTRONICS

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Headphone detection

STA321

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Doc ID 15351 Rev 3

12.2

Configuration example

This is an example of the register setup for headphones detection. It is assumed that every

peripheral is already configured and working correctly.

There are other configuration examples to help you get started please refer to other

chapters and also to Chapter 14: Register description on page 77 in order to get all the

necessary and complementary details.

Table 32 and Table 33 below give a possible setup for the headphones detection

configurations shown in Figure 51 and Figure 52, respectively.

Note:

The pullup on HPDET pad must always be disabled before using the HPDET function.

Note:

Comparator 1 and comparator 2 cannot be enabled simultaneously.

Table 32.

Headphone detection configuration sequence for binary SE

Value

Description

MISC on page 135

0x21

Enable core clock

PLLB on page 136

0x00

Use PLL clock

User FFX and CMOS bridge configuration

HPDET2 on page 138

0x80

Disable the HP_DET pull-up

HPDET1 on page 137

0x57

Use HP1 for hpdet filter; polarity = high; action =

mute; mod = binary SE; average time 170 ms.

HPDET2 on page 138

0x80

Select E_HP1 comparator

FFXCFG1 on page 81

0x00

Remove the tristate from the bridges

Table 33.

Headphone detection configuration sequence for binary headphone

Value

Description

MISC on page 135

0x21

Enable core clock

PLLB on page 136

0x00

Use PLL clock

User FFX and CMOS bridge configuration

HPDET2 on page 138

0x80

Disable the HP_DET pull-up

HPDET1 on page 137

0x5F

Use HP1 for hpdet filter; polarity = high; action =

mute; mod = binary HP; average time 170 ms.

HPDET2 on page 138

0x80

Select E_HP1 comparator

FFXCFG1 on page 81

0x00

Remove the tristate from the bridges

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