STA321MPL1TR datasheet(16/80 Pages) STMICROELECTRONICS

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Microphone interface

STA321MPL1

16/80

DocID029389 Rev 1

3.5

Sensitivity adjustment

The sensitivity adjustment control can be used to compensate the differences between

theoretical and real sensitivity. It is applied to all membranes of the microphone.

Sensitivity adjustment = [-4, 3.875) with a 0.125 dB step

Configuration registers: 0x5F(5-0), 0x60(5-0), 0x61(5-0)

3.6

Normal channel attenuation

The NORM_Att is a parameter which must be set to the sensitivity difference between the

High SPL channel and the Normal SPL channel. By default its value is set to 20 dB.

Configuration registers: 0x52(5-0), 0x63(5-0), 0x64(5-0)

3.7

Thresholds

Two thresholds can be configured to control/select the recombination engine behavior. In

particular, they can be used to give more weight (in the final output) to the Normal Channel

or to the High Channel which leads to choosing between having lower distortion (High

Channel) or lower noise floor (Normal Channel).

Configuration registers: 0x65(5-0), 0x66(5-0), 0x67(5-0), 0x68(5-0), 0x69(5-0), 0x6A(5-0)

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