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.. _hardware_reference_birch:

Librem 5 Phone -- Birch
=======================

The sections on this page contain information about the Birch revision of the Librem 5 phone.

.. contents::
Quick Start Guide
-----------------

The version of the Quick Start Guide included with the phone can be downloaded: :download:`Librem5-Quick-Start-1.0.3.pdf <_files/Librem5-Quick-Start-1.0.3.pdf>`

Components
----------

System on Chip and Peripherals
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  * `Customer grade i.MX 8M Quad <https://www.nxp.com/products/processors-and-microcontrollers/arm-based-processors-and-mcus/i.mx-applications-processors/i.mx-8-processors/i.mx-8m-family-armcortex-a53-cortex-m4-audio-voice-video:i.MX8M>`_ [`datasheet <https://www.nxp.com/docs/en/data-sheet/IMX8MDQLQIEC.pdf>`_]
    and [`reference manual <https://www.nxp.com/webapp/Download?colCode=IMX8MDQLQRM>`_]

    * Four ARM Cortex-A53 cores.
    * One Cortex-M4.
    * Vivante GC7000Lite graphics
    * 1 ⨉ Gigabit Ethernet

  * 32 GB eMMC
  * 3GB RAM
  * SPI NOR Flash
  * Real Time Clock (RTC)

.. _`hardware_ref_birch_audio`:
  * Wolfson Media WM8962
  * Headphones and external microphone via CTIA-configured 3.5mm jack
  * Loudspeaker

Battery
~~~~~~~

  * `Texas Instruments BQ25895 <http://www.ti.com/product/BQ25895>`_ battery charge controller [`datasheet <BQ25895_>`_]

Bluetooth, Wi-Fi, WWAN
~~~~~~~~~~~~~~~~~~~~~~
  * Bluetooth I2S interface
  * Bluetooth (SDIO)
  * RedPine WiFi/BT M.2 module on SDIO
  * Broadmobi BM818-E1 or BM818-A1 WWAN module
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 * `LN3560 Synchronous Boost Flash Driver <https://www.ti.com/product/LM3560/technicaldocuments>`_ [`datasheet <LM3560_>`_]
.. _`hardware_ref_birch_display`:
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 * Mantix MLAF057WE51 MIPI DSI LCD panel: 720x1440 pixels and touch
   controller

.. _`hardware_ref_birch_kill_switches`:

GNSS
~~~~

  * `Teseo-LIV3F`_ multiconstellation GNSS receiver (UART2 interface and antenna)

Hardware Kill Switches
~~~~~~~~~~~~~~~~~~~~~~

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 * Diodes Incorporated Power Switch [`datasheet <AP2281_>`_]
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   * WWAN (Modem)
   * WiFi/Bluetooth
   * Microphone and Camera
.. _hardware_ref_birch_headers:
 * Used for `indicating charging status <LED colors_>`_

.. _`hardware_ref_birch_micro_sd`:
.. _`hardware_ref_birch_nano_sim`:

nano-SIM and microSD Cards
~~~~~~~~~~~~~~~~~~~~~~~~~~

 * Combined microSD and nano-SIM slot

Push Buttons
~~~~~~~~~~~~

  * Power
  * Volume up
  * Volume down

Sensors and Motors
~~~~~~~~~~~~~~~~~~

  * Haptic motor
  * `ST LSM9DS1 accelerometer, gyro, magnetometer <https://www.st.com/en/mems-and-sensors/lsm9ds1.html>`_ [`datasheet <LSM9DS1_>`_]
  * Vishay VCML4040 proximity and ambient light sensor [`datasheet <VCNL4040M3OE-H5_>`_]

.. _`hardware_ref_birch_smart_card`:

Smart Card
~~~~~~~~~~

..  * `Microchip SEC1110 <https://www.microchip.com/wwwproducts/en/SEC1110>`_ smart card reader [`datasheet <SEC1110_>`_]
..  * Amphenol 1010027182 smart card slot [`datasheet <1010027182_>`_]

Test Points
~~~~~~~~~~~

The 15 test points for UART1, UART2, JTAG, and the BOOT_MODE0/1 pins can be found below the WLAN module on the rear of the phone, as shown with the rear cover removed.

.. raw:: html

   <div class="figure align-center">
   <object data="images/Birch-test-points.svg" type="image/svg+xml"
           width="610" height="315"
           alt="The locations of test points on the rear of the phone">
   </object>
   <p class="caption"><span class="caption-text">See a <a href="images/Birch-test-points.svg">larger version</a> of this image
   </span></p>
   </div>

The USB test points are located in the recessed area above the battery compartment.

.. _`hardware_ref_birch_usb`:

USB
~~~

  * Serial Downloader support (loading u-boot via USB)
  * USB-C port including USB-C role switching
  * `USB Hub and SD controller <https://www.microchip.com/wwwproducts/en/USB2642>`_ [`datasheet <USB2642_>`_]

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Schematics
----------

The following schematics are available:

 * Librem 5 Birch main board: :download:`librem5_birch_mainboard_schematic.pdf <_files/librem5_birch_mainboard_schematic.pdf>`
 * Librem 5 Birch USB C board: :download:`librem5_birch_usb-c_board_schematic.pdf <_files/librem5_birch_usb-c_board_schematic.pdf>`

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The images below show X-ray images of the circuit boards. Click on the images to see larger versions.
.. |image-1| image:: images/Birch/birch-1.jpg
   :target: images/Birch/birch-1.jpg
   :alt: Top-left of upper side of the circuit board
.. |image-2| image:: images/Birch/birch-2.jpg
   :target: images/Birch/birch-2.jpg
   :alt: Top-right of upper side of the circuit board
.. |image-3| image:: images/Birch/birch-3.jpg
   :target: images/Birch/birch-3.jpg
   :alt: Middle-left of upper side of the circuit board
.. |image-4| image:: images/Birch/birch-4.jpg
   :target: images/Birch/birch-4.jpg
   :alt: Middle-right of upper side of the circuit board
.. |image-5| image:: images/Birch/birch-5.jpg
   :target: images/Birch/birch-5.jpg
   :alt: Lower-left of upper side of the circuit board
.. |image-6| image:: images/Birch/birch-6.jpg
   :target: images/Birch/birch-6.jpg
   :alt: Lower-right of upper side of the circuit board
.. |image-7| image:: images/Birch/birch-7.jpg
   :target: images/Birch/birch-7.jpg
   :alt: Left end of upper side of the USB connector board
.. |image-8| image:: images/Birch/birch-8.jpg
   :target: images/Birch/birch-8.jpg
   :alt: Right end of upper side of the USB connector board

.. centered:: |image-1| |image-2|
.. centered:: |image-3| |image-4|
.. centered:: |image-5| |image-6|
.. centered:: |image-7| |image-8|

Second view:

.. |image-d5| image:: images/Birch/birch-d5.jpg
   :target: images/Birch/birch-d5.jpg
   :alt: Top-left of lower side of the circuit board
.. |image-d6| image:: images/Birch/birch-d6.jpg
   :target: images/Birch/birch-d6.jpg
   :alt: Top-right of lower side of the circuit board
.. |image-d4| image:: images/Birch/birch-d4.jpg
   :target: images/Birch/birch-d4.jpg
   :alt: Middle-left of lower side of the circuit board
.. |image-d3| image:: images/Birch/birch-d3.jpg
   :target: images/Birch/birch-d3.jpg
   :alt: Middle-right of lower side of the circuit board
.. |image-d1| image:: images/Birch/birch-d1.jpg
   :target: images/Birch/birch-d1.jpg
   :alt: Lower-left of lower side of the circuit board
.. |image-d2| image:: images/Birch/birch-d2.jpg
   :target: images/Birch/birch-d2.jpg
   :alt: Lower-right of lower side of the circuit board
.. |image-c2| image:: images/Birch/birch-c2.jpg
   :target: images/Birch/birch-c2.jpg
   :alt: Left end of lower side of the USB connector board
.. |image-c1| image:: images/Birch/birch-c1.jpg
   :target: images/Birch/birch-c1.jpg
   :alt: Right end of lower side of the USB connector board

.. centered:: |image-d5| |image-d6|
.. centered:: |image-d4| |image-d3|
.. centered:: |image-d1| |image-d2|
.. centered:: |image-c2| |image-c1|

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Third view:
.. |image-b2| image:: images/Birch/birch-b2.jpg
   :target: images/Birch/birch-b2.jpg
   :alt: Top-left of the circuit board
.. |image-b1| image:: images/Birch/birch-b1.jpg
   :target: images/Birch/birch-b1.jpg
   :alt: Top-right of the circuit board
.. |image-b3| image:: images/Birch/birch-b3.jpg
   :target: images/Birch/birch-b3.jpg
   :alt: Upper-middle-left of the circuit board
.. |image-b4| image:: images/Birch/birch-b4.jpg
   :target: images/Birch/birch-b4.jpg
   :alt: Upper-middle-right of the circuit board
.. |image-b6| image:: images/Birch/birch-b6.jpg
   :target: images/Birch/birch-b6.jpg
   :alt: Middle-left of the circuit board
.. |image-b5| image:: images/Birch/birch-b5.jpg
   :target: images/Birch/birch-b5.jpg
   :alt: Middle-right of the circuit board
.. |image-b7| image:: images/Birch/birch-b7.jpg
   :target: images/Birch/birch-b7.jpg
   :alt: Lower-middle-left of the circuit board
.. |image-b8| image:: images/Birch/birch-b8.jpg
   :target: images/Birch/birch-b8.jpg
   :alt: Lower-middle-right of the circuit board
.. |image-b10| image:: images/Birch/birch-b10.jpg
   :target: images/Birch/birch-b10.jpg
   :alt: Lower-left of the circuit board
.. |image-b9| image:: images/Birch/birch-b9.jpg
   :target: images/Birch/birch-b9.jpg
   :alt: Lower-right of the circuit board

.. centered:: |image-b2| |image-b1|
.. centered:: |image-b3| |image-b4|
.. centered:: |image-b6| |image-b5|
.. centered:: |image-b7| |image-b8|
.. centered:: |image-b10| |image-b9|

Complete stitched images:

.. |complete-stitched-images| image:: images/Birch/birch-stitched.jpg
   :target: images/Birch/birch-stitched.jpg
   :alt: Complete X-rays images of the Librem 5 circuit board

.. centered:: |complete-stitched-images|

.. include:: /links.txt