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AN4146 Datasheet(PDF) 10 Page - STMicroelectronics |
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AN4146 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 30 page Demonstration board and accessories AN4146 10/30 DocID023502 Rev 2 1.5.1 Power supply The STA321MP processor needs 3.3 V as a supply voltage while the operative voltage range of the microphones is 1.64 V - 3.6 V where the typical value is 1.8 V. For this reason there are two voltage regulators onboard. One regulator is used to generate the 3.3 V from an external 5 V supply (J20) while the other one generates the 1.8 V from the 3.3 V. The 3.3 V can also be provided from the APWLink connector on pin 11 and enabled on the board by closing JP1. In spite of the fact that the STEVAL-CCA035V1 board is always connected (for the I2C communication) and so 3.3 V is always provided to the STEVAL-MKI126Vx, the demonstration board also hosts the 3.3 V regulator (scaled by an external 5 V supply) to allow better noise immunity. The following diagram depicts the supply lines scheme: S2 (R78-R79) selects the 3.3 V source while S3 (R80-R81) selects either 1.8 V or 3.3 V as the microphone supply voltage. These selectors are indicated on the board with the serigraphy 3V3 SEL and MIC_VCC, respectively. Figure 8. Power supply - block diagram subsection Once the 3.3 V voltage supply has been chosen, the devices that are fed with this voltage are the STA321MP, the flip-flop, the level shifter and the opamp. Regarding the microphones section, the selector S3 offers the possibility to choose their supply level. Regulator 1.8V Regulator 3.3V Gnd +5V JP1 S3 S2 +3.3V APWlink connector |
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