CS43131 datasheet(37/156 Pages) CIRRUS

37 / 156 page

DS1155F1

CS43131

4.4 Alternate Headphone Inputs

5. Clear the PDN_HP bit.

Figure 4-8. External VCP_FILT Power-Down Sequence

For powering down in this mode, use the following recommended sequence. This assumes that the CS43131 starts from

the status where VCP_FILT± pins are presented with ±3.0 V, respectively.

1. Set PDN_HP.

2. Wait 8 ms after I2C ACK.

3. Start to shut-off external supply to VCP_FILT± pins.

4. Wait until Hi-Z mode is presented on VCP_FILT± pins.

5. Clear EXT_VCPFILT and HV_EN bits.

4.4 Alternate Headphone Inputs

The top-level schematic of the alternate headphone inputs is shown in Fig. 4-9. Bits PDN_HP and HP_IN_EN configure

the audio source for the HPOUT pins. The switches connected to HPINx are controlled by HP_IN_EN. The switches

connected to the internal headphone driver are controlled by PDN_HP. When the alternate headphone inputs are selected

(HP_IN_EN = 1), the CS43131 internal headphone driver output needs to be disconnected (PDN_HP = 1). Likewise, when

the CS43131 internal headphone drivers are enabled, the HPINx switch needs to be open and not in the signal path.

Figure 4-9. Alternative Headphone Input Setup

EXT_VCPFILT

PDN_HP

VCP_FILT+

VCP_FILT‐

8 ms

+3.0 V

‐3.0 V

Hi‐Z

HPREFB

HPOUTA

HPOUTB

HPINA

HPINB

HPREFA

HPREFB

HPOUTA

HPOUTB

HPINA

HPINB

HPREFA

PDN_HP=0

HP_IN_EN=0

PDN_HP=1

HP_IN_EN=1

HPREFB

HPOUTA

HPOUTB

HPINA

HPINB

HPREFA

PDN_HP=1

HP_IN_EN=0

CS43131 Datasheet(PDF) 37 Page - Cirrus Logic

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