Technical Specifications
Contents
1. mDC_AUX_SEND G 12V DC Powered USB 9V DC Powered mA USB mA DC 1 Quiescent power consuption with no add on mod Positive Voltages on_ these rails will shut off the onboard power system ray RETURNJP AUX 2 4 USB_AUX_SEND_JP DC_AUX_SEND_JP REG by shutting off the PMOS ar ules October 2011 PRELIMINARY RELEASE Page 4 BoardX has a few tricks up its sleeve One of these is the ability to use a secondary power regulation system of your own choice if the built in linear regulators are not up to your application Auxiliary power is activated by attaching DC or USB power in the usual fashion and leaving the on off slide switch in the off position labeled on the board as AUX DC and USB Power are automatically made available on the pins labeled DC SEND and USB SEND respectively The auxiliary power system s ports are located around the onboard linear regulators AUX signals should be connected to a separate system of regulation maybe DC to DC maybe something else the choice is yours A specific add on board can also be made to fit the board and become self con tained However you proceed ensure 5V 3 3V and option ally DCVcc are returned on their respective return lines 5V and 3 3V must be present and have sufficient capacity for all onboard systems to operate properly Be sure no signals are otherwise connected to these return lines as noted in the picture any positive voltage a2. regulated using the onboard linear regulators Main Port Details Unregulated Signaling and Time Limits Max Recommended 100 MHz Trace Bandwidth MAIN PORT Max UART lt gt USB 3 000 kbps Baud Theoretical based on wavelength and bandwidth equations using measured board characteristics and recommendations for bus standards Calculations are based on a round trip from one end of the board to the other and back for extra safety margin Max supported baud rate for UART to USB converter chip The chip can be bypassed by cutting the high lighted traces on the back of the motherboard which should increase this clock rate Calculated using component datasheets and supple mented with PCB Toolkit www saturnpcb com Physical Dimensions 2 Drill Hole Size 125 in 0 318 cm IRESET Active Low Reset Port Overview Signal driven low by reset button or other The Main Port is the primary location for add on source Do not drive modules that supply complex functionality It provides signal is normally at 3 3V a large design area as well as connections to every ma USBM USBP Differential USB Bus jor signal on the board A data signals Negative Polarity USBM and Secondary Add on Ports are smaller and well suited Positive USBP for simple things such as sensors or memory Many of these can fit on the board simultaneously and can be made cheaply by the end user or third parties October 2011 PRELIMINA
3. BoardX Motherboard BoardxX is a collection of electronic circuit boards that stack on top of one another to share resources com municate and extend the functionality of one another This system is built on a motherboard that acts as both an electrical and structural foundation Unlike similar products but much like a familiar PC system the motherboard does not come with a pro cessor pre installed Processors come as simple low cost add on boards which allow any processor or multiple processors to be used with the system Add ons can be attached to the USB SPI UART and I2C buses to provide any feature imaginable These can be sensors communication interfaces or even physi cal control devices such as motors or servos With this idea in mind a robust and flexible design can be achieved that allows you to choose which parts of the system to design and which parts to buy off the shelf Distinguishing Characteristics e Processor independent hardware the hardware is compatible with any processor and even multiple processors e Choice of full size add ons or cheaper mini add ons e Multiple independent add on sockets to reduce vertical growth to 1 3 that of Arduino e A breadboard is included on the motherboard for quick prototyping e Reverse power polarity and short circuit detection to protect projects against accidental misconnects e High current allowance permits direct powering of motors servos and other pow
4. RY RELEASE Page 2 V O1 amp 2 Active Low Data Terminal Ready signal sent from USB host indicating it is ready to accept data This is pulled low automatically by the USB to Serial converter chip on power up Connect this in series Technical Specifications General Purpose I Os GPIOs that are routed to all Add on Port and Main Port devices Use for any purpose A GPIO routed to all Main Port devices but not to Add on Ports with a 0 1 uF capacitor to Add On Port Details the RESET signal and a host computer can do a remote reset Active Low Request to send signal driven low by an MCU to indicate that data is ready to send Active Low Clear to send signal driven low by host computer to indicate that data is ready to be received SCL SDA I2C Serial Clock and Serial Data lines tied to 3 3V through a 4 7K pull up resistor These should never be driven high as they are open drain TXD Transmit data from an MCU or device ADD ON SOCKET1 RXD Receive data going to an Signals 3V3 5V DCVec Active Low SPI Slave Select Line SPI Master Data Output SPI Master Data Input SPI Bus Clock October 2011 PRELIMINARY RELEASE Active Low Reset Sig nal driven low by reset button or other source Do not drive signal is normally at 3 3V Page 3 UPGRADE 4 Technical Specifications USB to Serial Converter The BoardX Motherboard routes power and I O on two layers bot
5. bove 0 7V will disable the onboard power regulators Auxiliary Power Board Breadboard Number of Positions 170 October 2011 PRELIMINARY RELEASE Technical Specifications The breadboard is provided to assist you in your prototyping adventures Simple tasks such as blinking LEDs or even motor control and audio amplification will easily fit becoming portable along with the rest of your project Signals from any location on the board may be safely connected using solid gauge hookup wire Additional power connectors are available along the perimeter as they are the most commonly used Fin Page 5
6. er hungry uses Traits Shared with Popular Brands e Stackable design e Arduino compatible e Open source October 2011 PRELIMINARY RELEASE Technical Specifications e Free documentation and software e Easy connectivity e Unique shape and color Electrical Limits Max Power Dissipation T 10 W T lt 25 C 25 CG 1 W otherwise Max DCVcc Dropout Voltage 0 05 V Amp Trace resistance 0 35 V Diode Max 5 0V Dropout Voltage 0 28V 500 mA Max 3 3V Dropout Voltage 0 28V 5 0V Dropout Max DCVcc Current 4 9 A DC 5V 3 3V Max 3 3V Current Max 5 0V Current 2 A 5V 3 3V Max USB Current 500 mA Steady State Current 800 mA Minimum 3 3V Input Voltage Minimum 5 0V Input Voltage Applied to DC Input This is routed directly to the DCVcc signal on board and also powers the 5V and 3 3V linear regulators 2 Pulsed All current draws from DCVcc or USBVcc Meeting or exceeding this level for more than brief periods of time may result in overheating or instability in the linear regulators USB Current limiting auto resetting fuse triggers at gt 500 mA It heats up and increases resistance until current drops below threshold 3 3V power passes through the 5V regulator count ing against its quota 5 T Ambient Temp T Conductor Temp For each linear regulator 5 0V and 3 3V individu ally Page 1 INDUSTRIES Technical Specifications 7 When
7. h of which contain ground planes The ground planes are connected at various points by vias Uo pe A and device pins RESET osci asco Power signals are routed using a minimum trace width YELLOW 2 1U 10MA 3 42 wor em aua of 24 mils 0 024 in Multiple connections are made m uson throughout the board to decrease the effective resis eer tance in these traces High current applications will o RED 2 0U 10MA r A TATT find themselves limited not so much by trace resis tance but by the restrictions made by other compo nents on the board The main power protection diode Si gn als for example allows a constant current draw of 2 3 A depending on ambient temperature To simplify automatic switching between USB and DC power sources 3 3V power cascades through the 5V regulator first and then re regulated down to 3 3V If you need efficiency see the section on Auxiliary MCU_TXD Transmit data from an Power MCU MCU_RXD Receive data going to an Double regulation means that the current through the MCU 3 3V regulator must be calculated as I5V 13 3V TXD gt MCU RXD This applies to power dissipation as well Rape GUD Auxiliary Power Power Distribution Routing and POWER SLIDE SWITCH Quiescent Power Consumption ppe pees 5V DC Powered 9V DC Powered USBP Cutable Re connectable traces to disable enable USB to Serial 5V and 3 3V power is controlled by linear regulators OC_TO_SWITCH 2
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