1,737 bytes added,
23:48, 30 July 2011 == µC comparison ==
=== AVR ===
[[http://www.atmel.com/dyn/resources/prod_documents/doc7766.pdf AVR]]
* EEPROM
* can run at 5V
* 12 ADC inputs
* JTAG
* analog comparator
* ADC reference voltage
=== ARM ===
[[http://www.nxp.com/documents/data_sheet/LPC1311_13_42_43.pdf 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 ====
* [[http://ww1.microchip.com/downloads/en/DeviceDoc/22026b.pdf]]
* $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 ====
* [[http://www.semtech.com/images/datasheet/sc195.pdf]]
* $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 ====
* [[http://www.onsemi.com/pub_link/Collateral/NCP1521B-D.PDF]]
* $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)