WM8959 datasheet(72/155 Pages) WOLFSON

72 / 155 page

WM8959

Pre-Production

PP, May 2008, Rev 3.1

GENERAL PURPOSE INPUT/OUTPUT

The WM8959 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 WM8959 has six multi-purpose pins for these functions.

•

GPIO1, GPIO3, GPIO4 and GPIO5: 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

•

Clock 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 36.

GPIO PIN FUNCTION

GPIO PINS

GPIO1

GPIO3

GPIO4

GPIO5

GPI7

GPI8

BCLK2

DACLRC2

DACDAT2

Button/Accessory Detect Input

Clock Output

Temperature OK

PLL Lock

Logic 1 and Logic 0

Interrupt

SDOUT (Readback Data)

Pull-up and Pull-down Available

Table 36 Functions Available on GPIO Pins

The GPIO pins are configured by a combination of register settings described in Table 37 to Table 40

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 and GPIO1_ENA)

4. GPIO functionality (GPIOn_SEL)

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