Power Supply
---------------

+---------------------------+------------------+---------------------------+----+---------------------+------------------+----------------+--------------+
| Pin                       | Signal           | Description                                                             | type           | I/O          |
+===========================+==================+===========================+====+=====================+==================+================+==============+
| 1-4                       | VDDIN            | Module power supply input (observe DIMM socket contact current rating)  | power          | I            |
+---------------------------+------------------+---------------------------+----+---------------------+------------------+----------------+--------------+
|                           |                  | 1.8V or 3.3V I/O power supply output                                    |                |              |
|                           |                  | This output can be used for the module side supply of level shifters    |                |              |
|                           |                  | or for peripherals which are operated at the VDDIO voltage level.       |                |              |
|                           |                  +---------------------------+----+---------------------+------------------+                |              |
|                           |                  | **Module**                     | **Remark**                             |                |              |
|                           |                  +---------------------------+----+---------------------+------------------+                |              |
|                           |                  | TX27                           |                     | max. 900mA       |                |              |
|                           |                  +---------------------------+----+                     +------------------+                |              |
|                           |                  | TX51                           | VDDIO=1.8V          | max. 200mA       |                |              |
| 5-7                       | VDDIO            +---------------------------+----+                     +------------------+ power          | O            |
|                           |                  | TX28S                          |                     | max. 20mA        |                |              |
|                           |                  +---------------------------+----+                     +------------------+                |              |
|                           |                  | TX25, TX28                     |                     | max. 200mA       |                |              |
|                           |                  +---------------------------+----+ VDDIO=3.3V          +------------------+                |              |
|                           |                  | TX48, TX53                     |                     | max. 900mA       |                |              |
|                           |                  +---------------------------+----+                     +------------------+                |              |
|                           |                  | TX6                            |                     | max. 300mA       |                |              |
|                           |                  +---------------------------+----+                     +------------------+                |              |
|                           |                  | TX8M, TX8P, TXRZ, TX93         |                     | max. 900mA       |                |              |
|                           |                  +---------------------------+----+                     +------------------+                |              |
|                           |                  | TXMP                           |                     | max. 300mA       |                |              |
+---------------------------+------------------+---------------------------+----+---------------------+------------------+----------------+--------------+
|                           |                  | +3.3V Power supply output                                               |                |              |
|                           |                  +---------------------------+----+---------------------+------------------+                |              |
|                           |                  | **Module**                     | **Remark**                             |                |              |
|                           |                  +---------------------------+----+---------------------+------------------+                |              |
|                           |                  | TX27                           |                                        |                |              |
|                           |                  +---------------------------+----+ max. 1A                                |                |              |
|                           |                  | TX51                           |                                        | power          | 0            |
| 9-12                      | VDD33            +---------------------------+----+---------------------+------------------+                |              |
|                           |                  | TX25, TX28, TX48, TX53, TX6,   | VDDIO and VDD33 are connected on the   |                |              |
|                           |                  | TX8M, TXMP, TX8P, TXRZ, TX93   | module. Refer to ratings above.        |                |              |
+---------------------------+------------------+--------------------------------+----------------------------------------+----------------+--------------+
| 18,26,32,39,50,58,71,82,  |                  |                                                                         |                |              |
| 88,94,102,111,116,129,    | GND              |                                                                         |                |              |
| 142,147,160,171,200       |                  |                                                                         |                |              |
+---------------------------+------------------+-------------------------------------------------------------------------+----------------+--------------+

TX modules operates on a single supply and provide regulated power supply outputs to the baseboard.

.. figure:: ../images/power_supply.png
   :align: center


The use of level shifters on the baseboard to interface to 3.3V logic allows for universal module selection,
because the voltage is automatically translated between VDDIO (1.8V or 3.3V) and VDD33 (3.3V) levels.
Level shifters can be omitted on 3.3V only modules like the TX25,
but in that case it's not possible to use 1.8V modules anymore.