ATMEGA128 Development
Board
No Longer For Sale
Rev. 1.1 Oct, 2002
A
complete operational single board computer based on the powerful Atmel
ATMEGA128 microcontroller. All of the basic features required are
included and all useful pins are brought out to two 32 pin headers.
ATMEGA128-16AC Summary
data sheet. Full
data sheet.
The ATMEGA128 has 128-Kbyte self-programming
Flash Program Memory, 4-Kbyte SRAM, 4-Kbyte EEPROM, 8 Channel 10-bit A/D-converter.
JTAG interface for on-chip-debug. ISP programming interface. Up to
16 MIPS throughput at 16 Mhz.
Two UARTs, SPI, I2C interfaces.
If you are new to the AVR then I
would recommend a visit to Atmels
Web site and AVRFreaks.
Take a look at Getting Started with
the ATMEGA128.
Program with an ISP programmer or
via the JTAG interface. Use your STK-500 or any other low cost ISP
programmer. I use both PonyProg with a homebuilt parallel port programmer
and Atmels AVR ISP and they both work fine.
Development board features:
-
Atmel ATMEGA128-16AC microcontroller
-
14.7456 MHz crystal in socket for easy
replacement. Why not 16 MHz?
-
32.768 KHz oscillator for use as an RTC
(Real Time Clock)
-
Reset button
-
RS-232 interface good to 115 KBaud
using a MAX3221, with receive jumper disconnect, D-Sub 9 pin female
connector.
-
ISP interface - 6 pin for programming
-
JTAG interface - 10 pin for programming /
debugging
-
78M05 regulator, good for 500 mA at
5 volts with 7 to 30 volts input, or feed external regulated 5 VDC power
via either 32 pin header.
-
Power jack (2.0 mm pin, center positive)
- plug a 7 to 30V DC wall wart directly into the board
-
Power LED
-
Power disconnect jumper for board current
draw testing
-
Run LED connected to PD5
-
Ground test point
-
Proper analog supply with inductor
and capacitor filtration
-
Spare 28 TSSO surface mount device
pattern
-
Two 2x16 0.1" pin headers on 1.5" c/c spacing
connecting most CPU pins.
-
Above board pin extensions for attaching
scope probes, jumpers or a wire-wrap.
-
Board dimensions 1.75" x 2.85"
Board
Schematic (.pdf format)
Power Consumption Discussion
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