SGTL5000XNAA3R2 Datasheet, PDF (48/68 Pages) Freescale Semiconductor, Inc – Low Power Stereo Codec with Headphone Amp

FUNCTIONAL DEVICE OPERATION
PROGRAMMING EXAMPLES
BITS
10:8
7
6:4
3:2
1:0
FIELD
LVLADJL
RSVD
LVLADJC
MODE_LR
MODE_CM
RW RESET
DEFINITION
RW
0x0
These bits adjust the sensitivity of the left channel headphone short detector in 25 mA
steps.This trip point can vary by ~30% over process so leave plenty of guard band to
avoid false trips. This short detect trip point is also effected by the bias current
adjustments made by CHIP_REF_CTRL -> BIAS_CTRL and by CHIP_ANA_TEST1 -
> HP_IALL_ADJ.
0x3=25 mA
0x2=50 mA
0x1=75 mA
0x0=100 mA
0x4=125 mA
0x5=150 mA
0x6=175 mA
0x7=200 mA
RO
0x0
Reserved
RW
0x0
These bits adjust the sensitivity of the capless headphone center channel short
detector in 50 mA steps. This trip point can vary by ~30% over process so leave plenty
of guard band to avoid false trips. This short detect trip point is also effected by the bias
current adjustments CHIP_REF_CTRL -> BIAS_CTRL and by CHIP_ANA_TEST1 ->
HP_IALL_ADJ.
0x3=50 mA
0x2=100 mA
0x1=150 mA
0x0=200 mA
0x4=250 mA
0x5=300 mA
0x6=350 mA
0x7=400 mA
RW
0x0
These bits control the behavior of the short detector for the capless headphone central
channel driver. This mode should be set prior to powering up the headphone amplifier.
When a short is detected the amplifier output switches to classA mode internally to
avoid excessive currents.
0x0 = Disable short detector, reset short detect latch, software view non-latched short
signal
0x1 = Enable short detector and reset the latch at timeout (every ~50 ms)
0x2 = This mode is not used/invalid
0x3 = Enable short detector with only manual reset (have to return to 0x0 to reset the
latch)
RW
0x0
These bits control the behavior of the short detector for the capless headphone central
channel driver. This mode should be set prior to powering up the headphone amplifier.
When a short is detected the amplifier output switches to classA mode interally to avoid
excessive currents.
0x0 = Disable short detector, reset short detect latch, software view non-latched short
signal
0x1 = Enable short detector and reset the latch at timeout (every ~50 ms)
0x2 = Enable short detector and auto reset when output voltage rises (preferred mode)
0x3 = Enable short detector with only manual reset (have to return to 0x0 to reset the
latch)
SGTL5000
48
Analog Integrated Circuit Device Data
Freescale Semiconductor