2.5
Power Up
Operation
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Control Inputs
1.
HIZ:
This terminal is active LOW. This terminal can be used to (< 1ms) disable the output switching in
the event of a power failure. If the HIZ is tied to RESET, the volume ramps up slowly at start-up, but
the output switching is stopped at power down. Place JP6 in the NORM position to bypass the
function. This position ties HIZ to the 3.3 V supply. Place JP6 in the RESET position to tie HIZ to
RESET. Place JP6 in the EXT position if manual test is desired. When JP6 is in the EXT position, the
HIZ pin is accessible via the test point "EXT" and the HIZ function can be exercised by grounding this
test point to the board ground. The PGND at the power supply ground can be used for this test.
2.
RESET:
This terminal is active LOW. This terminal can be used for pop-free start/stop.
3.
FAULT
: This terminal is active LOW. This terminal is used to indicate short circuit faults. If this pin is
low, a short circuit at the output has been detected. FAULT will be reset if the RESET pin is pulled low,
or the PVCC supplies are turned off. Thermal fault is not reported on this pin.
4.
THERM_WARN
: This terminal is a TTL compatible push-pull output. Thermal warning flag goes low if
the die temperature has reached 125
°
C. This pin is automatically reset if the temperature drops back
below 105
°
C. The THERMAL WARNING LED lights when this pin goes low.
5.
SE/BTL
: This pin controls the starting up timing based on the output configuration. If SE/BTL is
connect to DVDD (SE), the start-up is slow to allow a pop-free start-up in single-ended configurations.
If the SE/BTL is connect to GND, the start-up is faster, as desired, for BTL configurations. Use the
jumper, JP1, to set this function.
1. Verify correct voltage and input polarity for the
±
9V supplies for the TAS3308 EVM and 10V - 26V
supply for the TAS5602EVM2. Turn the TAS3308 power supplies ON.
2. Prepare the TAS3308 EVM for audio play by using the Quick Setup Guide in the TAS3308EVM User's
Guide (TI document SLEU093). The user may want to turn down the volume on the audio source prior
to enabling the audio outputs to the TAS5602 audio amplifier. Connect the audio source to the
TAS3308 EVM and use the Pure Path Studio GDE to select the correct Mux to route the audio signal
to the PWM3 output.
3. Turn on the power supply for the TAS5602EVM2. LED2 next to the PVCC jack on the TAS5602EVM2
should be lit. Audio power should be reaching the speakers (loads) at this time.
4. Adjust the audio level using the Pure Path Studio GDE to produce the required audio signal.
TAS5602EVM2 Audio Power Amplifier Evaluation Module
4
SLAU258 – August 2008