WM8991 datasheet(82/174 Pages) WOLFSON

82 / 174 page

WM8991

Pre-Production

PP, May 2008, Rev 3.1

GENERAL PURPOSE INPUT/OUTPUT

The WM8991 provides a number of versatile GPIO functions to enable features such as mobile TV

support, Wi-Fi voice call recording, button and accessory detection and clock output.

The WM8991 has eight multi-purpose pins for these functions.

•

GPIO1 to GPIO6: Dedicated GPIO pins.

•

LIN3/GPI7 and RIN3/GPI8: Analogue inputs or button/accessory detect inputs.

The following functions are available on some or all of the GPIO pins.

•

Alternative DAC interface (DACDAT, DACLRC, BCLK)

•

Button detect (latched with programmable de-bounce)

•

MICBIAS / Accessory current or short circuit detect

•

Alternative MCLK input

•

Clock output

•

Inverted ADCLRC output

•

Temperature sensor output

•

PLL lock output

•

Logic '1' and logic '0' output

•

Interrupt event output

•

Serial data output (register readback)

The functions available on each of the GPIO pins are identified in Table 44.

GPIO Pin Function

GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6

GPI7

GPI8

ADCLRC

MCLK2

BCLK2

DACLRC2

DACDAT2

ADCLRCB

Button/Accessory Detect Input

YYY

Clock Output

YYY

Temperature OK

YYY

PLL Lock

YYY

Logic 1 and Logic 0

Interrupt

YYY

SDOUT (Readback Data)

YYY

Pull-up & Pull-down Available

GPIO PINS

Table 44 Functions Available on GPIO Pins

The GPIO pins are configured by a combination of register settings described in Table 45 to Table 48

in the following section. The order of precedence for the control of the GPIO pins is as listed below.

1. Pin pull-up or pull-down (GPIOn_PU, GPIOn_PD)

2. Audio Interface and GPIO Tristate (AIF_TRIS)

3. Pin configuration (AIFSEL, MCLK_SRC, ALRCGPIO1, and ALRCBGPIO6)

4. GPIO functionality (GPIOn_SEL)

WM8991 Datasheet(PDF) 82 Page - Wolfson Microelectronics plc

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