Difference between revisions of "User:Corecode/Microboard"
From Fixme.ch
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* http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=644-1020-1-ND | * http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=644-1020-1-ND | ||
* http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=535-10202-1-ND | * http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=535-10202-1-ND | ||
| + | |||
| + | |||
| + | == Ethernet == | ||
| + | |||
| + | === ENC28J60 === | ||
| + | |||
| + | [http://ww1.microchip.com/downloads/en/DeviceDoc/39662c.pdf ENC28J60] | ||
| + | |||
| + | * 10baseT | ||
| + | |||
| + | |||
| + | === LAN8720A === | ||
| + | |||
| + | [http://www.smsc.com/media/Downloads_Public/Data_Sheets/8720a.pdf LAN8720A] | ||
| + | |||
| + | * 10baseT/100baseTX | ||
Latest revision as of 16:59, 31 July 2011
Contents
µC comparison
AVR
- EEPROM
- can run at 5V
- 12 ADC inputs
- JTAG
- analog comparator
- ADC reference voltage
ARM
- ARM Cortex-M3
- higher frequency/MIPS
- 32bit architecture
LPC1342/43
- 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
NUC120
NUC120 Datasheet NUC120 Manual
- ARM Cortex-M0
- integrated LDO
- less efficient than the LPC
- very cheap; <= $2.50@1 at Arrow/Nu Horizons
- external crystal required
- slower clock (48MHz)
- more flash, RAM
Voltage regulators
Adjustable LDO
MCP1725-ADJE/SN
- MCP1725-ADJE/SN
- $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
- SC195ULTRT
- $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
- NCP1521BSNT1G
- $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)
Crystals
- http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=644-1020-1-ND
- http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=535-10202-1-ND
Ethernet
ENC28J60
- 10baseT
LAN8720A
- 10baseT/100baseTX
