Datasheet
ToDetectionBlock
HPLOUT
HPLCOM
HPROUT
HPRCOM
DifferentialHeadphone
Connector Assembly
B0245-03
SW1
MIC3L/LINE3L/MICDET
Pwr
Amp
Pwr
Amp
Pwr
Amp
Pwr
Amp
CONTROL REGISTERS
TLV320AIC3105
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......................................................................................................................................... SLAS513B – FEBRUARY 2007 – REVISED DECEMBER 2008
An output configuration for the case of the outputs driving fully differential stereo headphones is shown in
Figure 34 . In this mode, there is a requirement on the jack side that either HPLCOM or HPLOUT get shorted to
ground if the plug is removed, which can be implemented using a spring terminal in a jack. For this mode to
function properly, short-circuit detection should be enabled and configured to power down the drivers if a
short-circuit is detected. The registers that control this functionality are in page 0, register 38, bits D2 – D1.
Figure 34. Configuration of Device for Jack Detection Using a Fully Differential Stereo Headphone Output
Connection
The control registers for the TLV320AIC3105 are described in detail below. All registers are 8 bits in width, with
D7 referring to the most-significant bit of each register, and D0 referring to the least-significant bit.
Page 0/Register 0: Page Select Register
BIT
(1)
READ/ RESET DESCRIPTION
WRITE VALUE
D7 – D1 X 0000 000 Reserved, write only zeros to these register bits
D0 R/W 0 Page Select Bit
Writing zero to this bit sets page 0 as the active page for following register accesses. Writing a one to this
bit sets page 1 as the active page for following register accesses. It is recommended that the user read
this register bit back after each write, to ensure that the proper page is being accessed for future register
read/writes.
(1) When resetting registers related to routing and volume controls of output drivers, it is recommended to reset them by writing directly to
the registers instead of using software reset.
Page 0/Register 1: Software Reset Register
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 W 0 Software Reset Bit
0 : Don ’ t care
1 : Self clearing software reset
D6 – D0 W 000 0000 Reserved; don ’ t write
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