CS43L22 datasheet(57/66 Pages) CIRRUS

57 / 66 page

DS792F2

CS43L22

Confidential Draft

3/4/10

7.27.3

VP Reference

Sets the desired VP reference used for battery compensation.

7.28

VP Battery Level (Address 30h) (Read Only)

7.28.1

VP Voltage Level (Read Only)

Indicates the unsigned VP voltage level.

7.29

Speaker Status (Address 31h) (Read Only)

7.29.1

Speaker Current Load Status (Read Only)

Indicates whether or not any of the speaker outputs is shorted to ground.

VPREF[3:0]

Desired VP used to calculate the required attenuation on the speaker output:

(for VA = 1.8 V)

0000

1.5 V

0001

2.0 V

0010

2.5 V

0011

3.0 V

0100

3.5 V

0101

4.0 V

0110

4.5 V

0111

5.0 V

(for VA = 2.5 V)

1000

1.5 V

1001

2.0 V

1010

2.5 V

1011

3.0 V

1100

3.5 V

1101

4.0 V

1110

4.5 V

1111

5.0 V

Application:

“VP Battery Compensation” on page 27

432

VPLVL7

VPLVL6

VPLVL5

VPLVL4

VPLVL3

VPLVL2

VPLVL1

VPLVL0

VPLVL[7:0]

VP Voltage

...

0101 1110

3.0 V (for VA = 2.0 V); apply formula using actual VA voltage to calculate VP voltage.

...

0111 0010

3.7 V (for VA = 2.0 V); apply formula using actual VA voltage to calculate VP voltage.

...

Formula:

VP Voltage = (Binary representation of VPLVL[7:0]) * VA / 63.3

432

Reserved

SPKASHRT

SPKBSHRT

SPKR/HP

Reserved

SPKxSHRT

Speaker Output Load

No overload detected

Overload detected

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