WM8993 datasheet(100/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

100

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R22 (16h)

GPIOCTRL2

IM_GPI8_EI

GPI8 interrupt mask

0 = do not mask interrupt

1 = mask interrupt

GPI8_ENA

GPI8 input enable

0 = disabled

1 = enabled

IM_GPI7_EI

GPI7 interrupt mask

0 = do not mask interrupt

1 = mask interrupt

GPI7_ENA

GPI7 input enable

0 = disabled

1 = enabled

R23 (17h)

GPIO_POL

GPI8_POL

GPI8 interrupt polarity

0 = active high

1 = active low

GPI7_POL

GPI7 interrupt polarity

0 = active high

1 = active low

Table 65 Button Detect Interrupt Control

ACCESSORY DETECTION

Current detection is provided on each of the microphone bias sources MICBIAS1 and MICBIAS2.

These can be configured to detect when an external accessory (such as a microphone) has been

connected. The output voltage of each of the microphone bias sources is selectable. Two current

detection threshold levels can be set; these thresholds are applicable to both microphone bias

sources.

The logic signals from the current detect circuits may be output directly on the GPIO1 pin, and may

also be used to generate Interrupt events. See “GPIO1 Control” for details of outputting the

accessory detection flags on the GPIO1 pin.

The accessory detection circuits are inputs to the Interrupt function, with selectable de-bounce and

polarity control. The associated interrupt bits are latched once set and can be polled at any time or

used as inputs to the IRQ output. See “Interrupts” for more details of the Interrupt event handling.

The interrupt bits are latched once set; they are reset by writing a logic ‘1’ to the _EINT register bits

in Register R18 (12h). De-bouncing is provided in order to avoid false event triggers. Note that

TOCLK must be enabled when this input de-bouncing is required.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1 (1h)

Power

Management

(1)

MICB2_ENA

Microphone Bias 2 Enable

0 = OFF (high impedance output)

1 = ON

MICB1_ENA

Microphone Bias 2 Enable

0 = OFF (high impedance output)

1 = ON

R58 (3Ah)

MICBIAS

7:6

JD_SCTHR

[1:0]

Jack Detect (MICBIAS) Short Circuit threshold

00 = 300uA

01 = 600uA

10 = 1200uA

11 = 2400uA

These values are for AVDD1=3.0V and scale

proportionally with AVDD1.

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