User:Corecode/Microboard

µC comparison

AVR

[AVR]

• EEPROM
• can run at 5V
• 12 ADC inputs
• JTAG
• analog comparator
• ADC reference voltage

ARM

[ARM]

• higher frequency/MIPS
• 32bit architecture
• only up to 3.6V
• 8 ADC inputs
• hardware divide
• 400kS/s ADC
• integrated HID and MSC device driver
• integrated USB MSC boot loader (needs 12MHz crystal)
• higher active current
• lower deep-sleep current
• requires external LDO

• existing boards
  • http://voltsandbytes.com/lpc1343-breakout-board/
  • http://code.google.com/p/micropendousx/
  • http://www.olimex.com/dev/lpc-p1343.html

Voltage regulators

Adjustable LDO

MCP1725-ADJE/SN

• [[1]]
• $0.56@1, $0.39@100
• Adjust with two resistors
• Extra parts: 2 R (+ 1 R for power good, 1 C for delayed power good)
• dropout 210mV - 350mV
• max input 6V
• max current 500mA
• output 2.3V - 5V, fixed version available at 1.8V, 2.5V, 3.3V
• required C: 4.7µF, 1µF

Adjustable switching regulator

SC195ULTRT

• [[2]]
• $0.96@1, $0.555@100
• Adjust with logic input pins
• Extra parts: 1 L
• max input 6V
• max current 500mA
• output 0.8V - 3.3V
• required C: 4.7µF, 10µF; L: 1µH
• suggested layout given

NCP1521BSNT1G

• [[3]]
• $0.92@1, $0.63@100
• Adjust with two resistors
• Extra parts: 2 R, 1 L, 1 C
• max input 5.5V
• max current 600mA
• output 0.9V - 3.3V
• required C: 4.7µF, 18pF, 10µF; L: 2.2µH (or 4.7µF and 4.7µH)