This pin can be used to power down the IC to converse power
http://www.utc-ic.com/spec/KA8602.pdf
7 Mute This pin can be used to power down the IC to converse power, or for muting, or both. When at a logic “LOW” (less than 0.8V), the IC is enabled for normal operation. When at a logic “HIGH” (2V to Vcc), the IC is disabled. If Mute is open, that is equivalent to a logic “LOW”.
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