Power saving strategies

Audio

General

• reduce clock rates in audio, CM etc.

• have a software controlled MOSFET to kill power from the entire section (audio, vibration etc.).

• use the hardware switches.

Mic

• mic supports sleep mode (by slowing down I2S clock to < 1kHz)

• disable second mic (if present) and only record on one channel.

• be smart about when the mic is powered on.

• use dedicated hardware switch.

Codec

• Use PowerTune in the codec, it allows trading off between power and audio performance by selecting different power modes for ADC and DAC channels.

• avoid using internal codec PLL.

• Reduce sampling rates and bit depths

Power

... will add more