Newer
Older
Design and specifications
#########################
If you want to know how the BeaglePlay hardware is designed and what are it's
high-level specifications then this chapter is for you. We are going to discuss
each hardware design element in detail and provide high-level device
specifications in a short and crisp form as well.
.. tip::
You can download BeaglePlay schematic to have clear view of
all the elements that makes up the BeaglePlay hardware.
`BeaglePlay design repository <https://git.beagleboard.org/beagleplay/beagleplay>`__
The block diagram below shows all the parts that makes up your BeaglePlay board.
BeaglePlay as mentioned in previous chapters is based on AM6254 SoC which is shown in the middle.
Connection of other parts like power supply, memory, storage, wifi, ethernet, and others is also
clearly shown in the block diagram. This block diagram shows the high level specifications of the
BeaglePlay hardware and the sections below this are going to show you the individual part in
more detail with schematic diagrams.
.. figure:: images/block-diagrams/System-Block-Diagram.svg
:align: center
:alt: BeaglePlay block diagram
`AM62x Sitara™ Processors <https://www.ti.com/product/AM625>`_ from Texas Instruments are
Human-machine-interaction SoC with Arm® Cortex®-A53-based edge AI and full-HD dual display.
AM6254 which is on your BeaglePlay board has a multi core design with Quad 64-bit Arm®
Cortex®-A53 microprocessor subsystem at up to 1.4 GHz, Single-core Arm® Cortex®-M4F
MCU at up to 400MHz, and Dedicated Device/Power Manager. Talking about the multimedia
capabilities of the processor you can connect upto two display monitors with 1920x1080 @ 60fps
each, additionally there is a OLDI/LVDS (4 lanes - 2x) and 24-bit RGB parallel interface for connecting
external display panels. One 4 Lane CSI camera interface is also available which has support
for 1,2,3 or 4 data lane mode up to 2.5Gbps speed. The list of features is very long and if you
are interested to know more about the AM62x SoC you may take a look at
`AM62x Sitara™ Processors datasheet <https://www.ti.com/lit/ds/symlink/am625.pdf>`_.
.. figure:: images/am625.svg
:width: 1247
:align: center
:alt: AM6254 SoC block diagram
AM6254 SoC block diagram
Power management
*****************
Different parts of the board requires different voltages to operate and to fulfill requirements of
all the chips on BeaglePlay we have Low Drop Out (LDO) voltage regulators for fixed voltage output
and Power Management Integrated Circuit (PMIC) that interface with SoC to generate software programable voltages.
2 x LDOs and 1 x PMIC used on BeaglePlay are shown below.
.. figure:: images/block-diagrams/Power-Block-Diagram.svg
:width: 1247
:align: center
:alt: BeaglePlay power block diagram
TLV75801 - LDO
===============
.. figure:: images/hardware-design/TLV75801PDBVR.svg
:width: 1247
:align: center
:alt: TLV75801PDBVR LDO schematic for 1V0 output
TLV75801PDBVR LDO schematic for 1V0 output
This provides 1.0V required by the single-pair Ethernet PHY (U13 - DP83TD510ERHBR). It was decided this was less
likely to be needed than the other rails coming off of the primary PMIC and therefore was given its own regulator
when running low on power rails.
.. note::
The voltage drop from 1.8V to 1.0V is rated up to 0.3A (240mW), but the typical current from the
DP83TD51E data sheet (SNLS656C) is stated at 3.5mA (2.8mW) and the maximum is 7.5mA (6mW). This isn't overly
significant on a board typically consuming 400mA at 5V (2W). However, this is an area where some power
optimization could be performed if concerned about sleep modes.
TLV62595 - DC/DC regulator
==========================
.. figure:: images/hardware-design/TLV62595DMQR.svg
:width: 1247
:align: center
:alt: TLV62595DMQR DC/DC regulator schematic for 3V3 output
This provides 3.3V for the vast majority of 3.3V I/Os on the board, off-board 3.3V power to microSD, mikroBUS,
QWIIC and Grove connectors, as well as to the PMIC LDO to provide power for the 1.8V on-board I/Os, DDR4, and
gigabit Ethernet PHY. Due to the relatively high current rating (3A), a highly efficient (up to 97%) was chosen.
The primary TPS65219 PMIC firmware uses GPO2 to provide the enable signal (VDD_3V3_EN). The power-good signal
(VDD_3V3_PG) is available at TP19 and is unused on the rest of the board.
.. figure:: images/hardware-design/TPS65219.svg
:width: 1247
:align: center
:alt: TPS65219 Power Management Integrated Circuit (PMIC) schematic
TPS65219 Power Management Integrated Circuit (PMIC) schematic
This is the primary power management integrated circuit (PMIC) for the design. It coordinates the power
sequencing and provides numerous power rails required for the core of the system, including dynamic voltages
for the processor core and microSD card. The TPS6521903 variant is used for this DDR4-based system. The 03
at the end indicates the sequencing programmed into the device and is covered in the TPS6521903 Technical
Reference Manual `SLVUCJ2 <https://www.ti.com/lit/pdf/slvucj2>`_.
.. todo::
Add specific power-up/down sequence notes here as well a highlight any limitations and known issues.
General Connectivity and Expansion
One of the main advantage of using a Single Board Computer (SBC) is having direct accessibility of
general purpose input & output (GPIO) pins and other interfaces like I2C, SPI, ADC, PWM. Your BeaglePlay
board shines in this domain as well with mikroBUS connector that can take 1000s of click board from
`MikroElektronika <https://www.mikroe.com/>`_, Grove connector allows to connect hundereds of Grove modules
from `Seeed Studio <https://www.seeedstudio.com/grove.html>`_, and QWIIC connector allows to connect I2C modules
like QWIIC modules from `SparkFun <https://www.sparkfun.com/qwiic>`_ or STEMMA QT modules from
`Adafruit <https://www.adafruit.com/category/1005>`_. Note that you also get one USB-A port and one USB-C port.
BeaglePlay's USB-A port with host support enables you to connect any USB device like your keyboard & mouse.
The USB-C connector allows you to power the board and to connect the board to a PC. You can then connect via SSH or
use the pre-installed VisualStudio Code editor by putting the address ``192.168.7.2:3000`` in your web browser.
.. figure:: images/hardware-design/usb.svg
:width: 1247
:align: center
:alt: USB-A and USB-C
ADC102S051 - 2ch 10bit ADC
===========================
.. figure:: images/hardware-design/ADC102S051.svg
:width: 1247
:align: center
:alt: ADC102S051 - 12bit Aanalog to Digital Converter (ADC)
ADC102S051 - 12bit Aanalog to Digital Converter (ADC)
.. figure:: images/hardware-design/mikroBUS.svg
:width: 1247
:align: center
:alt: mikroBUS connector schematic
.. figure:: images/hardware-design/grove.svg
:width: 1247
:align: center
:alt: Grove connector schematic
.. figure:: images/hardware-design/qwiic.svg
:width: 1247
:align: center
:alt: QWIIC connnector for I2C modules
To interact with the Single Board Computers we use buttons for input and LEDs for visual feedback.
On your BeaglePlay board you will find 3 buttons each with a specific purpose: power, reset, and user.
For visual feedback you will find 5 user LEDs near USB-C port and 6 more indicator LEDs near your BeaglePlay's
Single Pair ethernet port. Schematic diagrams below show how these buttons and LEDs are wired.
+-------------------------------------------------------------+-------------------------------------------------------------+--------------------------------------------------------+
| Power | Reset | User |
+=============================================================+=============================================================+========================================================+
| .. image:: images/hardware-design/power-button.svg | .. image:: images/hardware-design/reset-button.svg | .. image:: images/hardware-design/power-button.svg |
| :width: 742 | :width: 742 | :width: 742 |
| :align: center | :align: center | :align: center |
+-------------------------------------------------------------+-------------------------------------------------------------+--------------------------------------------------------+
.. figure:: images/hardware-design/leds.svg
:width: 1247
:align: center
:alt: BeaglePlay LEDs
Wired and wireless connectivity
********************************
.. figure:: images/hardware-design/WL1807MODGIMOC.svg
:width: 1247
:align: center
:alt: Gigabit ethernet
Single pair ethernet
=====================
.. figure:: images/hardware-design/single-pair-ethernet.svg
:width: 1247
:align: center
:alt: Single pair ethernet
Single pair ethernet
WL1807MOD - WiFi 2.4G/5G
=========================
.. figure:: images/hardware-design/WL1807MODGIMOC.svg
:width: 1247
:align: center
:alt: WL1807MOD dual-band (2.4G/5G) WiFi
CC1352P7 - BLE & SubGHz
========================
.. figure:: images/hardware-design/cc1352.svg
:width: 1247
:align: center
:alt: CC1352P7 Bluetooth Low Energy (BLW) and SubGHz connectivity
CC1352P7 Bluetooth Low Energy (BLW) and SubGHz connectivity
Memory, Media and Data storage
********************************
DDR4
====
.. figure:: images/hardware-design/ddr4.svg
:width: 1247
:align: center
:alt: DDR4 Memory
.. figure:: images/hardware-design/emmc.svg
:width: 1247
:align: center
:alt: eMMC/SD storage
.. figure:: images/hardware-design/micro-sd-card.svg
:width: 1247
:align: center
:alt: microSD Card storage slot
.. figure:: images/hardware-design/board-id.svg
:width: 1247
:align: center
:alt: Board EEPROM ID
HDMI
=====
.. figure:: images/hardware-design/hdmi.svg
:width: 1247
:align: center
:alt: HDMI output
HDMI output
OLDI
=====
.. figure:: images/hardware-design/oldi.svg
:width: 1247
:align: center
:alt: OLDI display interface
OLDI display interface
CSI
====
.. figure:: images/hardware-design/csi.svg
:width: 1247
:align: center
:alt: CSI camera interface
.. figure:: images/hardware-design/rtc.svg
:width: 1247
:align: center
:alt: Real Time Clock (RTC)
Real Time Clock (RTC)
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
================
.. figure:: images/hardware-design/debug.svg
:width: 1247
:align: center
:alt: UART debug port
UART debug port
AM62x JTAG & TagConnect
=======================
.. figure:: images/hardware-design/am62-jtag.svg
:width: 1247
:align: center
:alt: AM62 JTAG debug port and TagConnect interface
AM62 JTAG debug port and TagConnect interface
CC1352 JTAG & TagConnect
========================
.. figure:: images/hardware-design/cc1352-jtag.svg
:width: 1247
:align: center
:alt: CC1352 JTAG debug port and TagConnect interface
CC1352 JTAG debug port and TagConnect interface
.. _beagleplay-mechanical-specifications:
Mechanical Specifications
.. table:: Dimensions & weight
+--------------------+----------------------------------------------------+
| Parameter | Value |
+====================+====================================================+
| Size | 82.5x80x20mm |
+--------------------+----------------------------------------------------+
| Max heigh | 20mm |
+--------------------+----------------------------------------------------+
| PCB Size | 80x80mm |
+--------------------+----------------------------------------------------+
| PCB Layers | 8 layers |
+--------------------+----------------------------------------------------+
| PCB Thickness | 1.6mm |
+--------------------+----------------------------------------------------+
| RoHS compliant | Yes |
+--------------------+----------------------------------------------------+
| Weight | 55.3g |
+--------------------+----------------------------------------------------+
.. figure:: images/dimensions.png
:width: 700
:align: center
:alt: BeaglePlay board dimensions
BeaglePlay board dimensions
.. figure:: images/side-dimensions.png
:width: 700
:align: center
:alt: BeaglePlay board side dimensions
BeaglePlay board side dimensions