Initial System Block Diagram and Lower Level Requirements

Power Supply:
- 3.3V power for the microcontroller, display and output voltage controller
- Vi = 5 : 30V
  - Will power the 3.3V regulator
  - Sensed by input voltage and current sensor
  - Powers output power converter
Microcontroller:
- Low amount of processing, low clock speed required, 8MHz, maybe even 4MHz
- Has ADC pins (accuracy not a huge issue here)
  - Need 5 (Vi, Ii, Vo, Io) + voltage output controller
- Peripherals: want SPI to communicate with the display
Display:
- Show 4 rows of text at least
- Vi, Vo, Io and Ii for efficiency
- Possesses an SPI interface
Output Voltage Controller:
- Outputs 0V to 40V DC
- Use a switching regulator for efficiency
- Adjustable
Voltage Sensing:
- Vi and maybe Vo will be higher than 3.3V
- Will need to attenuate the value, will use a voltage divider and a voltage buffer
Current Sensing:
- Will use "in-line" resistor and an amplifier
- Will use "high-side" sensing
- Resistive Current Sensing: Low-Side vs. High-Side Sensing - Technical Articles

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