Hardware_Reference: Flesh out hardware details for audio components

Hardware_Reference.rst

@@ -34,9 +34,10 @@ Librem 5 Devkit
     * Wifi/Bluetooth
     * Microphone
 
-  * On-board microphone and speaker
+  * `NXP SGTL5000 <https://www.nxp.com/products/media-and-audio/audio-converters/audio-codec/ultra-low-power-audio-codec:SGTL5000>`_ audio codec [`datasheet <SGTL5000_>`_]
+  * `CUI CMC-2242PBL-A <https://www.cui.com/product/audio/microphones/electret-condenser-microphones/cmc-2242pbl-a>`_ electret condenser microphone [`datasheet <CMC-2242PBL-A_>`_]
+  * `PUI Audio AS01508MS-SP11-WP-R <http://www.puiaudio.com/product-detail.aspx?categoryId=6&partnumber=AS01508MS-SP11-WP-R>`_ speaker [`datasheet <AS01508MS-SP11-WP-R_>`_]
   * External microphone and speaker via 3.5mm jack
-  * Audio Codec
   * Bluetooth I2S interface
   * Bluetooth (UART4)
   * GNSS (UART interface and antenna)
@@ -61,3 +62,6 @@ Librem 5 Devkit
 Librem 5 Phone
 --------------
 note:: This section is subject to updates and revisions prior to the phone's
+
+
+.. include:: links.rst