STA321MPL1 datasheet(14/80 Pages) STMICROELECTRONICS

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Microphone interface

STA321MPL1

14/80

DocID029389 Rev 1

Figure 4. PDM clock generator

3.2

PDM resampling interface

The PDM resampling interface is used to properly sample external data.

It can work in three different modes: compatibility mode, dual-membrane mode and

advanced mode. In each mode, data are sampled at the rising or falling edge.

Table 8. Modes for PDM resampling interface

Compatibility mode

In this mode every channel is sampled at the rising edge.

Dual-membrane mode

The dual-membrane mode is a particular configuration (automatically applied when the

proper bit is asserted) which permits the use of the dual-membrane microphone. In

particular, it has 2 PDM data channels (normal and high) muxed in a single wire. The normal

channel is sampled at the falling edge, while the high channel is sampled at the rising edge.

Advanced mode

In this mode every channel can be sampled at the rising or falling edge according to the

configuration register.

Mode

Behavior

Compatibility (old)

Reserved

Dual-membrane

Advanced

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