287 lines
12 KiB
TeX
287 lines
12 KiB
TeX
{\bfseries{Subpages}}
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\begin{DoxyItemize}
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\item \mbox{\hyperlink{designChoices}{Design Choices}}
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\item \mbox{\hyperlink{deviceSpecifications}{Device Specifications}}
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\item \mbox{\hyperlink{powerDesign}{Power Design}}
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\end{DoxyItemize}
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\DoxyHorRuler{0}
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\hypertarget{hardware_autotoc_md1}{}\doxysection{Design Reminders}\label{hardware_autotoc_md1}
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\begin{DoxyItemize}
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\item From \char`\"{}\+Texas Instruments -\/ SLAS655\+G...\char`\"{}, Page 22\+:
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\begin{DoxyItemize}
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\item To improve EMI on the XT1 oscillator, the following guidelines should be observed\+:
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\begin{DoxyItemize}
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\item Keep the trace between the device and the crystal as short as possible.
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\item Design a good ground plane around the oscillator pins.
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\item Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT.
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\item Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins.
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{designChoices}{}\doxysection{Design Choices}\label{designChoices}
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\hypertarget{design_choices_autotoc_md2}{}\doxysubsection{JTAG Interface}\label{design_choices_autotoc_md2}
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When connecting the MCU to the programmer via the JTAG interface, it is possible for a local power supply connected to the MCU to be used or for power from the debugging/programming adapter to be used. Since having power supplied to the MCU from the debugging/programming adapter can be useful for use outside of the Sunseeker vehicle, we chose to use that.\hypertarget{design_choices_autotoc_md3}{}\doxysubsection{Microcontroller Connections}\label{design_choices_autotoc_md3}
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The board is going to be organized to the best of our abilities to be organized as such\+:
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\begin{DoxyItemize}
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\item Left Side\+:
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\begin{DoxyItemize}
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\item Peripherals for communicating with/controlling the Sunseeker vehicle
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\end{DoxyItemize}
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\item Right Side\+:
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\begin{DoxyItemize}
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\item Peripherals for communicating with users
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{design_choices_autotoc_md4}{}\doxysubparagraph{Universal Serial Communication Interfaces (\+USCIs)\+:}\label{design_choices_autotoc_md4}
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\begin{DoxyItemize}
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\item A -\/ Supporting up to four total of UART and/or SPI
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\begin{DoxyItemize}
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\item A0 \mbox{[}SPI\mbox{]}\+:
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\begin{DoxyItemize}
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\item CANbus Controller 0 (Microchip Technology MCP2515\+T-\/\+I/\+SO)
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\end{DoxyItemize}
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\item A1 \mbox{[}SPI\mbox{]}\+:
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\begin{DoxyItemize}
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\item CANbus Controller 1 (Microchip Technology MCP2515\+T-\/\+I/\+SO)
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\item GPS Receiver (U-\/\+Blox NEO-\/\+M9N \mbox{[}Spark\+Fun Breakout Board\mbox{]})
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\end{DoxyItemize}
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\item A2 \mbox{[}UART\mbox{]}\+:
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\begin{DoxyItemize}
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\item USB to UART Bridge (Future Technology Devices International FT230\+XS-\/R)
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\end{DoxyItemize}
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\item A3 \mbox{[}UART\mbox{]}\+:
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\item RS-\/232 Transceiver (Maxim Integrated MAX3232\+EUE+)
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\end{DoxyItemize}
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\item B -\/ Supporting up to four total of I2C and/or SPI
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\begin{DoxyItemize}
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\item B0 \mbox{[}SPI\mbox{]}\+:
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\begin{DoxyItemize}
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\item SD Card
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\end{DoxyItemize}
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\item B1 \mbox{[}I2C\mbox{]}\+:
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\begin{DoxyItemize}
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\item Inertial Measurement Unit (TDK Inven\+Sense ICM-\/20948)
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\end{DoxyItemize}
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\item B2 \mbox{[}I2C\mbox{]}\+:
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\begin{DoxyItemize}
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\item Real-\/\+Time Clock/\+Calendar (Microchip Technology \+MCP7940\+MT-\/\+I/\+SN)
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\end{DoxyItemize}
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\item B3 \mbox{[}SPI\mbox{]}\+:
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\begin{DoxyItemize}
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\item Bluetooth/\+Wi-\/\+Fi (Espressif Systems ESP32-\/\+WROVER-\/\+IE (8MB))
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}
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In addition to trying to keep the MCU and PCB organized with the left-\/side being to do with the Sunseeker vehicle and the right side to be peripherals interacting with users, we tried to also load-\/balance the USCI modules, as well as have the SPI protocol be used in more high data-\/rate peripherals and I2C used with lower or less-\/used peripherals. In Texas Instruments SLAS655G Document \mbox{[}Page 7\mbox{]} has a pin diagram showing the physical location of where each pin is physically located. \hypertarget{deviceSpecifications}{}\doxysection{Device Specifications}\label{deviceSpecifications}
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\hypertarget{device_specifications_autotoc_md5}{}\doxysubsubsection{Microcontroller\+: Texas Instruments MSP430\+F5438\+AIPZR}\label{device_specifications_autotoc_md5}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 1.\+8V to 3.\+6V Supply Voltage
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\item Up to 4.\+6mA needed
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\end{DoxyItemize}
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\item Capabilities\+:
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\begin{DoxyItemize}
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\item 16-\/bit architecture
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\item 25MHz System Clock
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\end{DoxyItemize}
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item Up to 4 of\+:
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\begin{DoxyItemize}
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\item UART/\+SPI
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\end{DoxyItemize}
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\item Up to 4 of\+:
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\begin{DoxyItemize}
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\item I2\+C/\+SPI
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\end{DoxyItemize}
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\item 12-\/bit ADC
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\begin{DoxyItemize}
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\item 14 external channels
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md6}{}\doxysubsubsection{Real-\/\+Time Clock/\+Calendar\+: Microchip Technology \+MCP7940\+MT-\/\+I/\+SN}\label{device_specifications_autotoc_md6}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 1.\+8V to 5.\+5V Supply Voltage
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\item 1.\+2uA typical timekeeping current required at 3.\+3V (This will be powered exclusively by a CR2032 battery)
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\end{DoxyItemize}
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item I2C
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\begin{DoxyItemize}
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\item Slave only
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\item Clock rate up to 400k\+Hz
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md7}{}\doxysubsubsection{Bluetooth/\+Wi-\/\+Fi\+: Espressif Systems ESP32-\/\+WROVER-\/\+IE (8\+MB)}\label{device_specifications_autotoc_md7}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 3.\+0V to 3.\+6V Supply Voltage
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\item Minimum 500mA needed up to 1.\+6A (500mA + 1100mA maximum cumulative IO output)
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\end{DoxyItemize}
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item I2C (2)
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\begin{DoxyItemize}
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\item Master or Slave
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\item 100kbit/s or 400kbit/s
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\item 7-\/bit/10-\/bit addressing mode
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\end{DoxyItemize}
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\item SPI
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\begin{DoxyItemize}
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\item SPI, HSPI and VSPI
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\item Master or Slave
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\item 1-\/line full-\/duplex and 1/2/4-\/line half-\/duplex
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\item Up to 80MHz
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\item Up to 64-\/byte FIFO
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\end{DoxyItemize}
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\item UART (3)
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\begin{DoxyItemize}
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\item Up to 5Mbps
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md8}{}\doxysubsubsection{GPS Receiver\+: U-\/\+Blox NEO-\/\+M9N}\label{device_specifications_autotoc_md8}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 2.\+7V to 3.\+6V
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\item 36mA typical will be likely usage
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\end{DoxyItemize}
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item SPI
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\begin{DoxyItemize}
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\item Slave Only
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\item 5.\+5\+MHz
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\end{DoxyItemize}
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\item UART
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\item I2C (Also called Display Data Channel (DDC))
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\begin{DoxyItemize}
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\item Slave Only
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\item 400k\+Hz
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md9}{}\doxysubsubsection{CANbus Controller\+: Microchip Technology MCP2515\+T-\/\+I/\+SO}\label{device_specifications_autotoc_md9}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 2.\+7V to 5.\+5V Supply Voltage
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\item 5mA typical in active mode; 1uA typical in sleep mode
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\end{DoxyItemize}
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item SPI
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\begin{DoxyItemize}
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\item Slave (Assuming only option)
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\item 10MHz
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md10}{}\doxysubsubsection{CANbus Transceiver\+: \+Texas Instruments SN65\+HVD234D}\label{device_specifications_autotoc_md10}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 3V to 3.\+6V Supply Voltage
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\item 6mA typical maximum; 200uA typical in standby
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\end{DoxyItemize}
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\item Used directly with CANbus Controller
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md11}{}\doxysubsubsection{SD Card (\+Generic)}\label{device_specifications_autotoc_md11}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 2.\+7V to 3.\+6V Supply Voltage
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\end{DoxyItemize}
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item SPI
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md12}{}\doxysubsubsection{USB to UART Bridge\+: Future Technology Devices International FT230\+XS-\/R}\label{device_specifications_autotoc_md12}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 3V to 5V Supply Voltage
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\item 8.\+3mA maximum usage in normal operation (This chip will be exclusively powered an external host device)
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\end{DoxyItemize}
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item UART
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md13}{}\doxysubsubsection{RS-\/232 Transceiver\+: Maxim Integrated MAX3232\+EUE+}\label{device_specifications_autotoc_md13}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 3V to 5.\+5V Supply Voltage
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\item Estimating 0.\+3mA typical average usage
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\end{DoxyItemize}
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\item Will use UART from the MCU
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\end{DoxyItemize}\hypertarget{device_specifications_autotoc_md14}{}\doxysubsubsection{Inertial Measurement Unit\+: TDK Inven\+Sense ICM-\/20948}\label{device_specifications_autotoc_md14}
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\begin{DoxyItemize}
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\item Power
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\begin{DoxyItemize}
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\item 1.\+71V to 3.\+6V Supply Voltage
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\item 3mA typical usage in full 9-\/Axis mode; 8uA typical in \char`\"{}\+Full-\/\+Chip Sleep Mode\char`\"{}
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\end{DoxyItemize}
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\item VDDIO Voltage input also needed from 1.\+71V to 1.\+95V
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\item Notable Peripherals\+:
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\begin{DoxyItemize}
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\item I2C
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\begin{DoxyItemize}
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\item Slave only
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\item 400k\+Hz
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\end{DoxyItemize}
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\item SPI
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\begin{DoxyItemize}
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\item Slave only
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\item 7MHz
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\end{DoxyItemize}
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\end{DoxyItemize}
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\end{DoxyItemize}\hypertarget{powerDesign}{}\doxysection{Power Design}\label{powerDesign}
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\hypertarget{power_design_autotoc_md15}{}\doxysubsection{Boost}\label{power_design_autotoc_md15}
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\hypertarget{power_design_autotoc_md16}{}\doxysubsubsection{Specifications}\label{power_design_autotoc_md16}
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The boost converter is used to power the Sunseeker Lighting board. Vin will be the car battery giving a a 12V input. This will then be boosted to 16V output, with an output current of 2A. The lights do not need to turn on, the instant the battery turns on, so including a time may benefit the board.\hypertarget{power_design_autotoc_md17}{}\doxysubsubsection{LTSpice Simulations}\label{power_design_autotoc_md17}
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\begin{DoxyItemize}
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\item The LTSpice boost circuit includes input and output resistors for input and output power calculations per Dr. Bazuin. These resistors will not be included in the Altium schematic.
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\item Dr. Bazuin suggested that an RC circuit can be added at the input for time-\/delay for output capacitor charging
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\item Output power = (16V)(2A(max))=32 Watts
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\item Input power = (12V)(Max FET current). Max FET current should be 2-\/3x the desired output current
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\item Rsense = Vsense(min)/\+IL(max). Vsense is given in LT1619 Datasheet\+: 40m\+V(min). For IL, we are using max FET current
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\begin{DoxyItemize}
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\item For Rsense, a smaller R value gives less output ripple voltage in simulation.
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\item Rsense is basically setting the current through the FET
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\end{DoxyItemize}
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\item Voltage divider equation can be found in datasheet for LT1619\+: Vout=(1.\+24V)(1+(R1/\+R2))
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\item Setting the VC resistor effects the oscillation of the output voltage
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\end{DoxyItemize}\hypertarget{power_design_autotoc_md18}{}\doxysubsubsection{Altium}\label{power_design_autotoc_md18}
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\begin{DoxyItemize}
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\item Inductor is 10uH MSS1210-\/103\+MEB. Dr. Bazuin suggested its use as Sunseeker has lots of them
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\item Replaced the SI9804\+DY FET (used in LTSpice) with the FDS6680A as the SI is obsolete
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\item Replaced the MBR735 Schottky (used in LTSpice) with the MBRD835\+LT4G because 735 is not surface mount
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\end{DoxyItemize}\hypertarget{power_design_autotoc_md19}{}\doxysubsection{Buck}\label{power_design_autotoc_md19}
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\hypertarget{power_design_autotoc_md20}{}\doxysubsubsection{Specifications}\label{power_design_autotoc_md20}
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The DC-\/\+DC buck regulator is a step-\/down converter used to lower the 12V input from the car battery to +3.\+3V to power the telemetry MCU.
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The initial buck converter design utilized the\hypertarget{power_design_autotoc_md21}{}\doxysubsubsection{LTSpice Simulations}\label{power_design_autotoc_md21}
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\hypertarget{power_design_autotoc_md22}{}\doxysubsubsection{Altium}\label{power_design_autotoc_md22}
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{\itshape asd}
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{\bfseries{asd}} |