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PEGMA Project

My PhD research involves the intelligent allocation of energy to peripherals in low power or energy harvested embedded systems. To that end, I have been designing the PEGMA (Peripheral Energy Generation Measurement and Allocation) board. This board will ultimately enable accurate monitoring and control of both the power generation and consumption of its own peripherals at a very fine-grained level.

Currently I am finishing up building the components using the EAGLE CAD Package. I will post the library upon completion though it will likely be undergoing frequent minor updates. For now, I feel confident in producing a list of the major components I will be using in no particular order:

  1. STMicro STM32F205RG
    1. 32-bit ARM Cortex M3 microcontroller with 2/12bit DACs and 24/12bit ADCs.
    2. Completely ported to Micrium uC/OSIII
    3. Extended Memory Interface (4GB addressable memory space)
    4. USB, UART, SPI, I2C, Wide range of operating voltages
  2. Texas Instruments LM2623
    1. DC/DC Boost Converter
    2. Startup voltage of 1.1V
    3. Max load current of 2A with 80uA typical operating current
    4. Adjustable output voltage and regulator efficiency of ~90%
  3. Linear Technology LTC1779
    1. DC/DC Buck Converter
    2. Low dropout voltage, 250mA max output current
    3. Adjustable output voltage and regulator efficiency of ~94%
  4. Maxim MAX4376H
    1.   Minimum supply voltage of 3.0V
    2.   High bandwidth (~500ns settling time)
    3.   High gain (100 V/V), High accuracy (~2.5%)
  5. NXP NX3L4051
    1. Low-voltage 4051 analog switch (Mux/DeMux)
    2. Low on-resistance ~.8ohms, Low quiescent current
  6. ISSI IS61WV51216
    1. 1Mb (512k x 16b) 3.3V SRAM
    2. Timing and pin compatible with the STM32F205RG
  7. Omron G6S + G6SU Relays
    1. Single coil latching and non-latching types
    2. 3.0V, 4.5V and 5V versions
  8. Honeywell HIH6130
    1. SPI compatible Temperature and Humidity Sensor
    2. Low power mode (1uA), Low supply voltage (2.3V)
    3. High accuracy and convenient SOIC-8 Package
  9. Panasonic VL-2330-F3N Lithium battery
    1. High capacity, surface mount package
    2. Charging / Discharging done through series resistor
  10. Aerocomm ZB2430
    1. Lowest power Zigbee module available
    2. 3.3V, 250kbps raw throughput (64kbps effective)
    3. Mesh software on module
  11. Microchip 25AA512
    1. 64KB SPI Serial EEPROM
    2. Wide voltage range (1.8V – 5.5V)
    3. High speed (20MHz)

I expect to create the power generation modules on an individual basis and as separate projects. Each type of energy harvesting module has a different set of characteristics and conditions unique to it. For instance a solar cell is fairly straightforward and could plug right into the LM2623. However, the piezo-electric and thermo-electric elements will likely require some type of bulk capacitor storage before supplying their energy to the system.

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