WM8903 datasheet(108/178 Pages) WOLFSON

108 / 178 page

WM8903

Production Data

PD, Rev 4.5, June 2012

108

The Digital Microphone Interface and MICBIAS Current Detect functions are described in the

“Analogue Input Signal Path” section.

Interrupt Output is the default function of GPIO4. See “Interrupts” for further details.

BCLK is the default function of GPIO5. This may be input or output. Note that, when BCLK is enabled

on this pin (GP5_FN = 1h), the other GPIO control fields for this pin have no effect. When BCLK is not

enabled on this pin (GP5_FN ≠ 1h), the WM8903 uses the MCLK input as the Bit Clock. See “Digital

Audio Interface Control” for further details.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R116 (74h)

GPIO Control

13:8

GP1_FN [5:0]

00_0000

GPIO 1 Pin Function select

00h = GPIO output

01h = Reserved

02h = IRQ output

03h = GPIO input

04h = MICBIAS Current detect

05h = MICBIAS Short Circuit detect

06h = DMIC_LR Clock output

07h = Reserved

08h = FLL Lock output

09h = FLL Clock output

0Ah to 3Fh = Reserved

GP1_DIR

GPIO Pin Direction

0 = Output

1 = Input

GP1_OP_CFG

Output pin configuration

0 = CMOS

1 = Open-drain

GP1_IP_CFG

Input pin configuration

0 = Active low

1 = Active high

GP1_LVL

GPIO Output Level

(when GP1_FN = 00000)

0 = Logic 0

1 = Logic 1

GP1_PD

GPIO Pull-Down Enable

0 = Pull-down disabled

1 = Pull-down enabled (Approx 100kΩ)

GP1_PU

GPIO Pull-Up Enable

0 = Pull-up disabled

1 = Pull-up enabled (Approx 100kΩ)

GP1_INTMODE

GPIO Interrupt Mode

0 = Level triggered

1 = Edge triggered

GP1_DB

GPIO de-bounce

0 = GPIO is not debounced

1 = GPIO is debounced

WM8903 Datasheet(PDF) 108 Page - Wolfson Microelectronics plc

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