Why are the mics on xCORE ARRAY MICROPHONE 1.8v?

Technical questions regarding the XTC tools and programming with XMOS.
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ccrome
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Why are the mics on xCORE ARRAY MICROPHONE 1.8v?

Post by ccrome »

Hi there,
Does anybody know why the microphones on the xCORE ARRAY MICROPHONE board (XK-USB-MIC-UF216) are driven at 1.8 volts? The mic spec itself allows up to 3.6V. Is it to come in under some power budget maybe?

Thanks,
-Caleb


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mon2
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Post by mon2 »

Hi Caleb. From the downloaded hardware manual, the schematic shows the array of Akustica AKU441 microphones being powered by +3v3. Do you have a different kit? Vaguely recall that at least one of the XMOS kits was fitted with the Infineon SMD microphones but not sure of their normal operation voltage.

xmos_microphones.png
(41.3 KiB) Not downloaded yet
xmos_microphones.png
(41.3 KiB) Not downloaded yet
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ccrome
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Post by ccrome »

mon2 wrote: Wed Jun 05, 2019 7:24 pm Hi Caleb. From the downloaded hardware manual, the schematic shows the array of Akustica AKU441 microphones being powered by +3v3. Do you have a different kit? Vaguely recall that at least one of the XMOS kits was fitted with the Infineon SMD microphones but not sure of their normal operation voltage.


xmos_microphones.png
Yeah, the latest version (V2.0) has the infineon microphones.

Here's an excerpt from
JGB0004-SCHEMATIC-2V0-A.PDF
mic_vdd.png
(143 KiB) Not downloaded yet
mic_vdd.png
(143 KiB) Not downloaded yet
The design files are in xCORE-Microphone-Array-design-files_2V0.zip.


Thanks,
-Caleb
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