lm4935rlx National Semiconductor Corporation, lm4935rlx Datasheet - Page 54

• Manufacturer Part Number: lm4935rlx
• Description: Audio Sub-system With Dual-mode Stereo Headphone And Mono High Efficiency Loudspeaker Amplifiers And Multi-purpose Adc
• Manufacturer: National Semiconductor Corporation

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Bits
12.0 Status & Control Registers
12.30 STATUS REGISTER
This register is used to report the status of the device.
Note 29: The detection IRQ is cleared when this register has been written to.
0
1
2
3
4
5
6
7
SAR TRIG 1
SAR TRIG 2
HEADSET
STEREO_
HEADSET
TEMP
GPIN
Field
BTN
MIC
This field is high when headset presence is detected (only valid if the detection system is
enabled). (Note 29)
This field is high when a headset with stereo speakers is detected (only valid if the detection
system is enabled). (Note 29)
This field is high when a headset with a microphone is detected (only valid if the detection system
is enabled). (Note 29)
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.
If this field is high then an event has happened on SAR trigger 1 (write to this register to clear
IRQ).
If this field is high then an event has happened on SAR trigger 2 (write to this register to clear
IRQ).
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.
When GPIO_SEL is set to a readable configuration a digital input on GPIO1 can be read back
here.
TABLE 30. STATUS (0x18h)
(Continued)
54
Description