WM8953ECSSLASHRV datasheet(41/100 Pages) WOLFSON

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Production Data

WM8953

PD, January 2009, Rev 4.0

GENERAL PURPOSE INPUT/OUTPUT

The WM8953 provides a number of versatile GPIO functions to enable features such as button and

accessory detection and clock output.

The WM8953 has five multi-purpose pins for these functions.

•

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.

•

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 19.

GPIO PINS

GPIO Pin Function

GPIO3

GPIO4

GPIO5

GPI7

GPI8

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 19 Functions Available on GPIO Pins

The GPIO pins are configured by a combination of register settings described in Table 20 to Table 23

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. GPIO functionality (GPIOn_SEL)

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