CS43L22 datasheet(28/68 Pages) CIRRUS

28 / 68 page

DS792F1

CS43L22

Confidential Draft

10/7/08

4.5.1

Mono Speaker Output Configuration

The CS43L22 accommodates a stereo as well as a mono speaker output configuration. In mono mode

the output drivers of each channel are connected in parallel to deliver maximum power to a 4 ohm speak-

er. Refer to the table below for pin mapping in mono configuration.

4.5.2

VP Battery Compensation

The CS43L22 provides the option to maintain a desired power output level, independent of the VP supply.

When enabled, this feature works by monitoring the voltage on the VP supply and reducing the attenua-

tion on the speaker outputs when VP voltage levels fall.

Note: The internal ADC that monitors the VP supply operates from the VA supply. Calculations are based

on typical VA levels of 1.8 V and 2.5 V using the VPREF bits.

4.5.2.1

Maintaining a Desired Output Level

Using SPKxVOL, the speaker output level must first be attenuated by the decibel equivalent of the expect-

ed VP supply range (MAX relative to MIN). The CS43L22 then gradually reduces the attenuation as the

VP supply drops from it’s maximum level, maintaining a nearly constant power output.

Compensation Example 1 (VP Battery supply ranges from 4.5 V to 3.0 V)

1. Set speaker attenuation (SPKxVOL) to -3.5 dB. The VP supply changes ~3.5 dB.

2. Set the reference VP supply (VPREF) to 4.5 V.

3. Enable battery compensation (BATTCMP).

The CS43L22 automatically adjusts the output level as the battery discharges.

Compensation Example 2 (VP Battery supply ranges from 5.0 V to 1.6 V)

1. Set speaker attenuation (SPKxVOL) to -10 dB. The VP supply changes ~9.9 dB.

2. Set the reference VP supply (VPREF) to 5.0 V.

3. Enable battery compensation (BATTCMP).

The CS43L22 automatically adjusts the output level as the battery discharges. Refer to Figure 11 on

page 29. In this example, the VP supply changes over a wide range, illustrating the accuracy of the

CS43L22’s battery compensation.

Speaker Output

SPKMONO=0

SPKMONO=1

SPKSWAP=0

SPKSWAP=1

SPKSWAP=0

SPKSWAP=1

SPKOUTA+

SPKOUTB+

SPKOUTA+

SPKOUTB+

SPKOUTA-

SPKOUTB-

SPKOUTA+

SPKOUTB+

SPKOUTA+

SPKOUTA-

SPKOUTB-

SPKOUTA-

SPKOUTB-

Referenced Control

SPKMONO..........................

SPKSWAP...........................

“Speaker MONO Control” on page 47

“Speaker Channel Swap” on page 46

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