LM4935 datasheet(53/112 Pages) NSC

53 / 112 page

12.0 Status & Control Registers (Continued)

12.30 STATUS REGISTER

This register is used to report the status of the device.

TABLE 30. STATUS (0x18h)

Bits

Field

Description

HEADSET

This field is high when headset presence is detected (only valid if the detection system is

enabled). (Note 29)

STEREO_

HEADSET

This field is high when a headset with stereo speakers is detected (only valid if the detection

system is enabled). (Note 29)

MIC

This field is high when a headset with a microphone is detected (only valid if the detection system

is enabled). (Note 29)

BTN

This field is high when the button on the headset is pressed (only valid if the detection system is

enabled). IRQ is cleared when the button has been released and this register has been written

to.

SAR TRIG 1

If this field is high then an event has happened on SAR trigger 1 (write to this register to clear

IRQ).

SAR TRIG 2

If this field is high then an event has happened on SAR trigger 2 (write to this register to clear

IRQ).

TEMP

If this field is high then a temperature event has occurred (write to this register to clear IRQ). This

field will stay high even when the IRQ is cleared so long as the event occurs. This bit is only valid

whenever the loudspeaker amplifier is turned off.

GPIN

When GPIO_SEL is set to a readable configuration a digital input on GPIO1 can be read back

here.

Note 29: The detection IRQ is cleared when this register has been written to.

LM4935 Datasheet(PDF) 53 Page - National Semiconductor (TI)