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7.8 HP Load-Detect Registers
7.8.1
Load-Detect R/C Status
R/O
7
Default
0
Bits
Name
7:6
Reserved
—
4
CLA_STAT
Capacitor load-detection result for HPA. See
Note: Low capacitance results were determined with C
0 (Default) High capacitance (C
1 Low capacitance (C
1:0
RLA_STAT
Resistor load-detection result for HPA. See
00 (Default) 15
01 30
7.8.2
HP Load Detect Done
R/O
7
Default
0
Bits
Name
7:1
—
Reserved
0
HPLOAD_
HP load detect done. Indicates whether HP load detection is finished.
DET_DONE
0 (Default) HP load is not finished.
1 HP load is finished.
7.8.3
HP Load Detect Enable
R/O
7
Default
0
Bits
Name
7:1
—
Reserved
0
HP_LD_EN
HP load detect enable. A 0-to-1 bit transition initiates load detection. See
0 (Default) Disabled
1 Enabled
7.9 Headset Interface Registers
7.9.1
HSBIAS Sense and Hi-Z Autocontrol
R/W
7
HSBIAS_SENSE_EN
Default
0
Bits
Name
7
HSBIAS_
HSBIAS current sense enable. Configures HSBIAS output current sense through the external 2.21-k resistor.
SENSE_
0 (Default) Disabled. Must be disabled in Short Detect-Only Mode when the headset circuit disconnects the mic module.
EN
Due to the open circuit, HSBIAS_SENSE = 1 if the S0 button is not being pressed. The current sense trip point is set via
HSBIAS_SENSE_TRIP. An interrupt can be configured to occur when the sensed current falls below the trip point.
1 Enabled
6
AUTO_
HSBIAS Hi-Z autocontrol. Sets how the Hi-Z Mode on the HSBIAS output is controlled. This bit is affected by
HSBIAS_
VP
(see
p.
150).
HIZ
0 (Default) No change to HSBIAS output. The Hi-Z Mode is also cleared if it had been previously set.
1 Sets HSBIAS to Hi-Z Mode when the current sense goes below its trip point or a HP unplug event occurs, depending on
which detector is enabled. To disengage Hi-Z Mode, clear this bit before resetting it to 1.
DS1083F2
6
5
—
CLA_STAT
0
0
~2 nF)
L
< ~2 nF)
L
10 3 k
11 Reserved
6
5
0
0
6
5
0
0
6
AUTO_HSBIAS_HIZ
TIP_SENSE_EN
0
4
3
—
0
0
Description
Section 4.4.4
for details.
= 1 nF; high capacitance results were determined with C
L
Section 4.4.4
for details.
4
3
—
0
0
Description
See
4
3
—
0
0
Description
5
4
—
0
0
Description
7.8 HP Load-Detect Registers
2
1
RLA_STAT
0
0
2
1
HPLOAD_DET_DONE
0
0
Section 4.4.4
for details.
2
1
0
0
Section 4.4.4
for details.
Address 0x1B70
3
2
1
HSBIAS_SENSE_TRIP
0
0
1
CS42L42
Address 0x1925
0
0
= 10 nF.
L
Address 0x1926
0
0
Address 0x1927
0
HP_LD_EN
0
0
1
LATCH_TO_
148
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