KWIKSTIK-K40 Datasheet, PDF (13/19 Pages) Freescale Semiconductor, Inc – KwikStik board assembly

2.10 Audio Output
Audio output options include a 3.5 mm miniplug connector that can be used with headphones or
external speakers. The audio power amplifier includes 16 step up/down digital volume control pins,
which can be controlled through GPIO pins on the K40 (VOLUME_UP, VOLUME_DOWN).
AUDIO_AMP_ON needs to be on to enable the amplifier
Refer to Table 4 “I/O Connectors and Pin Usage Table” for the audio output signal connection details.
Figure 11. Miniplug output circuit
The piezo-electric buzzer (LS1) can be driven with PWM modulated signals from the K40 TPM module.
R100 limits the current consumption of the buzzer (100 mA MAX) to 30mA.
Figure 12. Buzzer Circuit
KWIKSTIKK40UM
KwikStik-K40 User's Manual
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