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# LV2b Capstone v4 Node Requirements Page

Here are our requirements for front end (microprocess and power sections) of the v4 node.

## Global Requirements

1. Minimize size (including height)
  - ~= v3 front end (the old front end was about 2.25 sq.in. of double sided PCB, < 1 cm total thickness)
2. Minimize power consumption (previously ~190mW)
3. Minimize cost (<$150 front end)

## "PIC" a New Microcontroller

See the [[Microcontroller Search page|NodeMicrocontrollerSearch]] for requirements

## Upgrade Switching Power Supply

1. Meet old requirements:
  - 10 - 20V
  - > 70 % efficiency (old supply was 80%+ from 10mA to full load)
  - ~= existing supply size (plan area 1 sq.in. with components on both sides, i.e. 2 sq.in. total surface)
  - EMI compatible with onboard communication systems (e.g., crystal oscillator locked)
  - Must be able to shut down on external signal.
2. Node protection:
  - Undervoltage lockout
  - Overvoltage protection
  - Reverse polarity protection
3. Bus protection:
  - Current limiting (e.g., fuse)

## Connectors

1. Debug connector
2. Comm connector
  - High reliability
  - Locking
  - High density

## PCB

1. All signals routed to an edge towards the application specific circuitry
2. Robust mechanical mounting

## Secondary Goals (Things We Like)

1. Flash over primary communication interface.