WM9713 datasheet(82/111 Pages) WOLFSON

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WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

Table 65 Extended Power Down Register (2) (Additional to AC’97 Rev 2.2)

Note:

When disabling a PGA, always ensure that it is muted first.

ADDITIONAL POWER MANAGEMENT

Mixer output inverters: see “Mixer output Inverters” section. Inverters are OFF by default.

Touchpanel Interface: see “Controlling the Touchpanel Digitiser / Power Management”. The

touchpanel digitiser is OFF by default.

SLEEP MODE

Whenever the PR4 bit (reg. 26h) is set, the AC-Link interface is disabled, and the WM9713L is in

sleep mode. There is in fact a very large number of different sleep modes, depending on the other

control bits. For example, the low-power standby mode described below is a sleep mode. It is

desirable to use sleep modes whenever possible, as this will save power. The following functions do

not require a clock and can therefore operate in sleep mode:

•

Analogue-to-analogue audio (DACs and ADCs unused), e.g. phone call mode

•

Pen-down detection

•

GPIO and interrupts

•

Battery alarm / analogue comparators

The WM9713L can awake from sleep mode as a result of

•

A warm reset on the AC-Link (according to the AC’97 specification)

•

A signal on a GPIO pin (if the pin is configured as an input, with wake-up enabled –

see “GPIO and Interrupt Control” section)

•

A virtual GPIO event such as pen-down, battery alarm, etc. (see “GPIO and

Interrupt Control” section)

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MCD

1 (OFF)

Disables microphone current detect

MICBIA

1 (OFF)

Disables microphone bias

MONO

1 (OFF)

Disables MONO output PGA (see Note 1)

OUT4

1 (OFF)

Disables OUT4 output PGA

( “

“ )

OUT3

1 (OFF)

Disables OUT3 output PGA

( “

“ )

HPL

1 (OFF)

Disables HPL output PGA

( “

“ )

HPR

1 (OFF)

Disables HPR output PGA

( “

“ )

SPKL

1 (OFF)

Disables SPKL output PGA

( “

“ )

SPKR

1 (OFF)

Disables SPKR output PGA

( “

“ )

1 (OFF)

Disables LINEL PGA

( “

“ )

1 (OFF)

Disables LINER PGA

( “

“ )

MOIN

1 (OFF)

Disables MONOIN PGA

( “

“ )

1 (OFF)

Disables mic PGA MA

( “

“ )

1 (OFF)

Disables mic PGA MB

( “

“ )

MPA

1 (OFF)

Disables mic pre-amp MPA

3Eh

Powerdown

(2)

MPB

1 (OFF)

Disables mic pre-amp MPB

Note: When analogue inputs or outputs are disabled, they are internally connected to VREF

through a large resistor (VREF=AVDD/2 except when VREF and VMID1M are both OFF). This

maintains the potential at that node and helps to eliminate pops when the pins are re-enabled.

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