WM1811A datasheet(120/328 Pages) WOLFSON

120 / 328 page

WM1811A

Production Data

PD, November 2013, Rev 4.1

120

When the Charge Pump is disabled, the output can be left floating or can be actively discharged,

depending on the CP_DISCH control bit.

If the headphone output drivers (HPOUT1L and HPOUT1R) are not used, then the Charge Pump and

the associated external components are not required. The Charge Pump and Headphone drivers

should not be enabled in this case (CP_ENA=0, HPOUT1L_ENA=0, HPOUT1R_ENA=0).

If the Charge Pump is not used, and the associated external components are omitted, then the CPCA

and CPCB pins can be left floating; the CPVOUTP and CPVOUTN pins should be grounded as

illustrated in Figure 29.

Note that, when the Charge Pump is disabled, it is still recommended that the CPVDD pin is kept

within its recommended operating conditions.

Figure 29 External Configuration when Charge Pump not used

The Charge Pump control fields are described in Table 69.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R76 (004Ch)

Charge Pump

(1)

CP_ENA

Enable charge-pump digits

0 = Disable

1 = Enable

R77 (004Dh)

Charge Pump

(2)

CP_DISCH

Charge Pump Discharge Select

0 = Charge Pump outputs floating

when disabled

1 = Charge Pump outputs

discharged when disabled

R81 (0051h)

Class W (1)

9:8

CP_DYN_SRC_SEL

Selects the digital audio source for

envelope tracking

00 = AIF1, DAC data

01 = Reserved

10 = AIF2, DAC data

11 = Reserved

CP_DYN_PWR

Enable dynamic charge pump

power control

0 = charge pump controlled by

volume register settings (Class G)

1 = charge pump controlled by

real-time audio level (Class W)

Table 69 Charge Pump Control

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