Datasheet

Program Description
3-25
Operation
and SP2 pins), select from the DAC Output to lists. By default, the left channel
DAC output is routed to SP1 and the right channel to SP2.
The signal routed to SP1 can also be output to the loud speaker
(OUT8P/OUT8N), if the SP1 to Loud SP checkbox is checked.
The SP1 can be used in single-ended or differential mode. In the single-ended
mode, it is driven as one channel of the stereo headset outputs, and the audio
sound is received through a headset that has been plugged into the jack J7
on the EVM. In the differential mode, the SP1 is paired with the OUT32N pin
as the receiver driver, and the audio sound is received through a speaker that
has been connected to the terminal block J8 on the EVM. Note that the receiver
driver and the headphone drivers are not allowed to be turned on at the same
time. By default, the SP1 is set to single-ended mode.
Besides the DAC outputs, other inputs, such as the SideTone, KeyClick,
CP_IN, and BUZZ_IN can be routed to speaker 1 (SP1), speaker 2 (SP2),
and/or the loud speaker (LoudSP). The routing among these signals can be
done on this section by clicking on the corresponding checkbox. The signals
to SP1, SP2, or the ADC can be output to the TSC’s cellphone output pin.
Like the audio ADC gain controls, the DAC PGA gain, can be set to
soft-stepping mode. Under the soft-stepping mode, the soft stepping can be
set to either 0.5−dB per one sample, or 0.5−dB per two samples.
The stereo DAC audio volumes is controlled three different ways by the left (L)
and right (R) volume control slides, selectable through setting the master
volume controller: 1) independent, 2) right channel controlled, or 3) left
channel controlled.
In addition to the left and right DAC channel volume controls and mutes, the
analog signals from the SPK1, SPK2, OUT8P/OUT8N (loud speaker), and
CP_OUT pins can be individually muted or unmuted.
TSC2101 supports both capacitor-coupled (cap) and capacitor-less (capless)
interfaces for headset through software. Check the box Enable Capless
Headset Output to turn on the capless outputs. Note that SW3 on the EVM
board is associated with the software setting to have the proper cap or capless
audio outputs on the EVM.
3.5.4.5 GPIO1 and GPIO2 Sections
The two GPIO pins on the TSC2101 are programmed for several different
functions, selectable through the GPIO1 or GPIO2 section. Refer to the data
sheet for all of the functions. When a GPIO pin is used as a digital output, its
status can be controlled by the GPO Command to either logic high or low.
When not being used, the GPIO pin should be put on high impedance (Hi-Z)
status.
3.5.4.6 Headset Section
The headset section is in the Audio 2 tab, which is used mainly to set up the
headset input gain through the headset PGA or the AGC, selectable by the
Headset/AUX Input AGC ON checkbox.