WM1811A datasheet(132/328 Pages) WOLFSON

132 / 328 page

WM1811A

Production Data

PD, November 2013, Rev 4.1

132

When JACKDET_MODE = 01, LDO1 and LDO2 are disabled. AVDD1 is powered from AVDD2, and

DCVDD is powered from DBVDD1.

When JACKDET_MODE = 10, LDO1 and LDO2 are disabled. AVDD1 is unpowered, and DCVDD is

powered from DBVDD1.

Note that, in both modes described above, the LDO1ENA input pin is ignored. The LDO2ENA pin

must be asserted (logic ‘1’) to power DCVDD, although LDO2 will operate in a ‘bypass’ mode,

connecting DCVDD to DBVDD1.

Note that, in both modes described above, the AVDD1 voltage is below the minimum recommended

operating level. Analogue or digital audio functions cannot be supported in these modes.

Note that the LDO configuration for JACKDET_MODE = 01 or 10 assumes that AVDD1 and DCVDD

are powered from LDO1 and LDO2 respectively. If AVDD1 or DCVDD is powered externally (not from

the internal LDOs), then these settings of JACKDET_MODE must not be used.

If AVDD1 or DCVDD is powered externally (not from the internal LDOs), then the Jack Detect function,

when required, should be enabled by setting JACKDET_MODE = 11.

The control registers associated with the Jack Detect function are described in Table 77.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1797

(0705h)

JACKDET

Ctrl

JACKDET_DB

JACKDETinput de-bounce

0 = Disabled

1 = Enabled

JACKDET_LVL

JACKDET input status

0 = Jack not detected

1 = Jack is detected

R57 (39h)

AntiPOP (2)

8:7

JACKDET_MODE

JACKDET mode select

00 = Jack Detect disabled

01 = Jack Detect enabled

10 = Jack Detect enabled

11 = Jack Detect enabled

MICDET (microphone/accessory

detection) is not supported when

JACKDET_MODE = 10.

Analogue/Digital audio functions

are not supported when

JACKDET_MODE = 01 or 10.

LDO1_DISCH must be set to 0

when JACKDET_MODE=01.

Settings 01 and 10 must not be

selected if AVDD1 or DCVDD is

supplied externally (ie. if LDO1 or

LDO2 is not used).

Table 77 Jack Detect Control

Clocking for the jack detection function is derived from SYSCLK (defined in the “Clocking and Sample

Rates” section). The WM1811A can support accessory detection using a low frequency (eg. 32kHz)

clock for reduced power consumption. See the “External Accessory Detection Clocking” section below

for further details.

WM1811A Datasheet(PDF) 132 Page - Wolfson Microelectronics plc

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