Cirrus Logic CS42L52 - Manual (Page 32)

32 DS680F2
CS42L52
3/1/13
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 passthrough is enabled, regard-
less of the PDN_PGA setting. Refer to the table below for details on how this PGA power-down override
functions in accordance with the state of the headphone channels. The shaded cells represent normal
PGA operation when passthrough is disabled.
When passthrough 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
Note: The PWM speaker amplifiers should not be used in the 384x MCLK modes (18.4320 and
16.9344 MHz).
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.
Referenced Control Register Location
PDN_ADCx .........................
PASSTHRU .........................
PDN_OVRD ........................
SPKx_PDN[1:0]................... “Power Down ADCx” on page 43
“Passthrough Analog” on page 52
“Power Down ADC Override” on page 43
“Speaker Power Control” on page 44
PDN_PGA PASSTHRU HP Channel PGA Status
0 x x Powered UP
1
0 x Powered DOWN
1
OFF Powered DOWN
ON Powered UP
Referenced Control Register Location
PDN_PGAx .........................
PASSTHRU .........................
HPx_PDN[1:0]..................... “Power Down PGAx” on page 42
“Passthrough Analog” on page 52
“Headphone Power Control” on page 44
Pin
Speaker Output
SPKMONO=0 SPKMONO=1
SPKSWAP=0 SPKSWAP=1 SPKSWAP=0 SPKSWAP=1
4 SPKOUTA+ SPKOUTB+ SPKOUTA+ SPKOUTB+
6 SPKOUTA- SPKOUTB- SPKOUTA+ SPKOUTB+
7 SPKOUTB+ SPKOUTA+ SPKOUTA- SPKOUTB-
9 SPKOUTB- SPKOUTA- SPKOUTA- SPKOUTB-
Referenced Control Register Location
SPKMONO..........................
SPKSWAP........................... “Speaker MONO Control” on page 54
“Speaker Channel Swap” on page 54