WM8993 datasheet(104/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

104

FLL LOCK STATUS OUTPUT

The WM8993 maintains a flag indicating the lock status of the FLL, which may be used to control

other events if required. The FLL Lock status 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 FLL Lock flag

on the GPIO1 pin. See “Clocking and Sample Rates” for more details of the FLL.

The FLL Lock signal is an input to the Interrupt function, with selectable de-bounce and polarity

control. The associated interrupt bit is latched once set and can be polled at any time or used to

trigger the IRQ output. See “Interrupts” for more details of the Interrupt event handling.

The interrupt bit is latched once set; it is reset by writing a logic ‘1’ to the FLL_LOCK_EINT register

bit. 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

R18 (12h)

GPIO CTRL

FLL_LOCK_

EINT

FLL Lock interrupt

0 = interrupt not set

1 = interrupt is set

Cleared when a ‘1’ is written

R20 (14h)

IRQ_DEBOU

NCE

FLL_LOCK_

FLL Lock de-bounce

0 = disabled

1 = enabled

R22 (16h)

GPIOCTRL2

IM_FLL_LO

CK_EINT

FLL Lock interrupt mask

0 = do not mask interrupt

1 = mask interrupt

R23 (17h)

GPIO_POL

FLL_LOCK_

POL

FLL Lock interrupt polarity

0 = active high (interrupt is triggered when

FLL Lock is reached)

1 = active low (interrupt is triggered when FLL

is not locked)

Table 68 FLL Lock Interrupt Control

The FLL Lock signal is asserted when FLL Lock has been reached. When configured to generate an

interrupt event, the default value of FLL_LOCK_POL will cause an interrupt event when FLL Lock

has been reached.

When GPIO1_SEL = 0100, the FLL Lock signal is output on the GPIO1 pin. A logic 1 indicates that

FLL Lock has been reached. Note that the polarity is not programmable for GPIO output; the

GPIO1_POL and FLL_LOCK_POL fields affect the Interrupt behaviour only.

TEMPERATURE SENSOR OUTPUT

The WM8993 incorporates a temperature sensor which detects when the device temperature is

within normal limits or if the device is approaching a hazardous temperature condition. The

temperature status 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 Temp OK flag on the GPIO1 pin.

The temperature sensor signal is an input to the Interrupt function, with selectable de-bounce and

polarity control. The associated interrupt bit is latched once set and can be polled at any time or used

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

The interrupt bit is latched once set; it is reset by writing a logic ‘1’ to the TEMPOK_EINT register bit.

De-bouncing is provided in order to avoid false event triggers. Note that TOCLK must be enabled

when this input de-bouncing is required.

Note that the temperature sensor can be configured to automatically disable the audio outputs of the

WM8993 (see “Thermal Shutdown”). In some applications, it may be preferable to manage the

temperature sensor event through GPIO or Interrupt functions, allowing a host processor to

implement a controlled system response to an over-temperature condition.

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