Smart Module Series
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⚫ The module offers 1 differential MIC input pair, which can also be used as 2 single-ended MIC input
channels.
⚫ VCCIO1 can be used as MIC_BIAS and the output voltage is 1.8 V by default.
⚫ The loudspeaker interface uses the differential output. The output channel is available with a Class D
amplifier whose maximum output power is 1.3 W when the load is 8 Ω.
⚫ The headset interface features stereo left and right channel output, and headset insert detection
function is supported.
4.8.1. Microphone Interface Reference Design
If the analog audio
function is not used, this
pin needs to be connected
to VBAT.