WM8980_07 datasheet(79/112 Pages) WOLFSON

79 / 112 page

Pre-Production

WM8980

PP Rev 3.1 March 2007

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

GPIO1SEL

000

CSB/GPIO1 pin function select:

000= input (CSB/jack detection:

depending on MODE setting)

001= reserved

010=Temp ok

011=Amute active

100=PLL clk o/p

101=PLL lock

110=logic 0

111=logic 1

GPIO1POL

GPIO1 Polarity invert

0=Non inverted

1=Inverted

GPIO

Control

5:4

OPCLKDIV

PLL Output clock division ratio

00=divide by 1

01=divide by 2

10=divide by 3

11=divide by 4

2:0

GPIO4SEL

000

GPIO4 pin function select:

000= input jack detection

001= reserved

010=Temp ok

011=Amute active

100=PLL clk o/p

101=PLL lock

110=logic 0 1 IN REG MAP?

111=logic 1 0 IN REG MAP?

GPIO

Control

GPIO4POL

GPIO4 Polarity invert

0=Non inverted

1=Inverted

Table 59 CSB/GPIO Control

Note:

If MODE is set to 3 wire mode, CSB/GPIO1 shall be used as CSB input irrespective of the

GPIO1SEL[2:] bits.

Note that SLOWCLKEN must be enabled when using the Jack Detect function.

For further details of the Jack detect operation see the OUTPUT SWITCHING section.

OUTPUT SWITCHING (JACK DETECT)

When the device is configured with a 2-wire interface the CSB/GPIO1 pin can be used as a switch

control input to automatically disable one set of outputs and enable another. The L2/GPIO2,

R2/GPIO3 and GPIO4 pins can also be used for this purpose. For example, when a headphone is

plugged into a jack socket then it may be desirable to disable the speaker (e.g. when one of the

GPIO pins is connected to a mechanical switch in the headphone socket to detect plug-in).

The GPIO pins have an internal de-bounce circuit when in this mode in order to prevent the output

enables from toggling multiple times due to input glitches. This de-bounce circuit is clocked from a

slow clock with period 221 x MCLK.

Note that SLOWCLKEN must be enabled when using the Jack Detect function.

Note that the GPIOPOL bits are not relevant for jack detection, it is the signal detected at the pin

which is used.

WM8980 Datasheet(PDF) 79 Page - Wolfson Microelectronics plc

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