PDM microphone (02730A0019 or AKU242) electrical connection to nRF52832https://devzone.nordicsemi.com/f/nordic-q-a/13915/pdm-microphone-02730a0019-or-aku242-electrical-connection-to-nrf52832Hi, I am connecting the AKU242 straight to our microprocessor. It is a PDM interface so it has a SELECT, DATA, CLOCK, VDD and 5 GND signals. On the datasheet, there are two identical PDM microphones with one SELECT connected to GND and another SELECTen-USTelligent Community 13Fri, 17 Feb 2017 11:51:58 GMTRE: PDM microphone (02730A0019 or AKU242) electrical connection to nRF52832https://devzone.nordicsemi.com/thread/53187?ContentTypeID=1Fri, 17 Feb 2017 11:51:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8495e466-37a2-46af-aab3-d93e85d4e633Ole Bauck<p>Updated the link. The link was to the Product Specification.</p><div style="clear:both;"></div>RE: PDM microphone (02730A0019 or AKU242) electrical connection to nRF52832https://devzone.nordicsemi.com/thread/53186?ContentTypeID=1Fri, 17 Feb 2017 10:32:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:883fbd1d-f95d-4f4c-951b-64fbd44269f8Morten<p>Looks like the first link is dead, was it <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.rds/dita/rds/designs/smart_remote/smart_remote_3/hw_descr_prod_ex/codec.html">this</a> you were referring to?</p><div style="clear:both;"></div>RE: PDM microphone (02730A0019 or AKU242) electrical connection to nRF52832https://devzone.nordicsemi.com/thread/53185?ContentTypeID=1Thu, 19 May 2016 09:40:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9f5ee056-2d34-4060-a011-8ef83dc33757Ole Bauck<p>Hi,</p> <ol> <li> <p>If you take a look at the datasheet it actually says L/R SELECT. So this line determines if the microphone is left or right. See <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/pdm.html?cp=2_2_0_42_4#hardware_example">here</a> for hardware examples using PDM.</p> </li> <li> <p>Resistors should not be necessary in theory, but if the lines are long or there is much noise you may want to have resistors on the lines. Because of this I would recommend to start with 0 ohm resistors and if you have problems try to change them out with for example 50 ohm resistors (20 – 100 ohm should be good). The resistor on the CLOCK line should be close to the nRF and the resistors on the DATA line should be close to the PDM chip, like <a href="http://www.ofweek.com/Upload/plainimages/eliane/20140429/8.jpg">this</a>.</p> </li> </ol><div style="clear:both;"></div>