CS42L52 datasheet(33/82 Pages) CIRRUS

33 / 82 page

DS680A1

CS42L52

4.4.2

Overriding the PGA Power Down

To accommodate automatic activation of the headphone amplifier when the SPK/HP_SW switch pin

changes, the CS42L52 will automatically power up the PGA whenever passthru is enabled, regardless of

the PDN_PGA setting. Refer to the table below for how this PGA power-down override functions in accord

with the state of the headphone channels. The shaded cells represent normal PGA operation when

Passthru is disabled.

When Passthru is enabled, turning the headphone channel ON (by writing ‘11’b to HPx_PDN[1:0] or by

automatic activation of the headphone detect switch, SPK/HP_SW) will automatically disable the

PGAx_PDN in order to transmit the analog signal to the headphone.

4.5

PWM Outputs

4.5.1

Mono Speaker Output Configuration

The CS42L52 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 CS42L52 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 typ-

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

Referenced Control

PDN_ADCx .........................

PASSTHRU.........................

PDN_OVRD ........................

SPKx_PDN[1:0]...................

“Power Down ADCx” on page 43

“Passthru Analog” on page 52

“Power Down ADC Override” on page 43

“Speaker Power Control” on page 44

PDN_PGA

PASSTHRU

HP Channel

PGA Status

Powered UP

Powered DOWN

OFF

Powered DOWN

Powered UP

Referenced Control

PDN_PGAx .........................

PASSTHRU.........................

HPx_PDN[1:0].....................

“Power Down PGAx” on page 42

“Passthru Analog” on page 52

“Headphone Power Control” on page 44

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 54

“Speaker Channel Swap” on page 54

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