Texas Instruments TPA0202 - Manual (Page 25)

Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform
3-9 Details
3.3.2.1 S1 — Shutdown Jumper
To have the module amplifier IC enter the shutdown mode when the module
mute control input is activated, set shutdown jumper S1 to ON.
The mute control output pin on the TPA0202 amplifier IC follows the mute
control input pin and is buffered. Jumper S1 connects the mute output pin to
the shutdown control input pin of the IC so that when S1 is ON, the IC is forced
into shutdown mode instead of mute mode when the mute control input goes
high. When S1 is OFF, a pulldown resistor on the module holds the IC
shutdown control input pin low, keeping the IC out of the shutdown mode.
The shutdown mode reduces IC current consumption to approximately 5
µ
A
compared to approximately 1.5 mA in the mute mode. It takes longer, however,
to resume normal operation from the shutdown mode (approx. 1 s to 2 s) than
it takes to resume normal operation from the mute mode (approx. 100 ms to
500 ms).
3.3.2.2 S2 — Mute Switch
Pushbutton switch S2 on the TPA0202 EVM allows manual muting of the
amplifier IC.
3.3.2.3 S3 — Input Select Jumper
To select the line inputs, set input select jumper S3 to OFF. To select the
headphone inputs, set input select jumper S3 to
ON.
The TPA0202 amplifier IC has two separate inputs for each channel. An
internal multiplexor selects which input will be connected to the amplifier
based on the state of the HP/LINE pin on the IC. However, the EVM HP/L*
control input pin is not directly controlled by anything on the platform — the
platform socket for that module pin is N/C. The amplifier IC HP/LINE control
pin can be tied high manually via jumper S3 or connected to the amplifier IC
SE/BTL control pin via jumper S6 so that it follows that control signal.
For manual control, jumper S3 connects the HP/L* module control input pin to
V
DD
, so that when S3 is ON, the headphone inputs are selected. When S3 is
OFF, a pulldown resistor on the module holds the IC shutdown control input
pin low, selecting the line inputs.
3.3.2.4 S4 — Output Mode Jumper
To keep the module amplifier IC in the single-ended output mode regardless
of the module control input state, set jumper S4 to ON.
Jumper S4 connects the SE/BTL output mode control input pin on the amplifier
IC directly to V
DD
, so that when S4 is ON, the IC is held in the single-ended
output mode regardless of the state of the SE/BTL* module control input.
When S4 is OFF, a pulldown resistor on the module holds the IC output mode
control input pin low, keeping the IC in the BTL output mode.