letATwork IIHigh Tech
ATmega 103 / 128Microboard
[ Connection Pins | ISP Interface | Technical Data | Order ]
The Atmel ATmega103 and it's descendant ATmega128 are among the most powerful 8bit micro controllers. They are available in TQFP package, so we took the chance to mount them on
45 x 46 sq.mm, add a reset circuit, an "in-system programming" (ISP) socket and 5V voltage regulator. On letATwork revision II you also have an RS232 level output.
This board is not just an adapter but a complete motherboard for the ATmega 103 / 128. As soon as you connect power supply and ISP plug, you can start filling the 128 kByte program flash of the ATmega.
Give your developments new impulses, convince yourself ...
simply let AT work!
The pin connections
All Atmel ATmega 103 / 128 pins are available at two 0.1" pinout double rows, i.e. there are no restrictions for future extensions. For example external RAM can be added effortlessly.
All 6 ports and ADC inputs are available. Additionally there is a 5V (50mA) output which is useful to supply your external circuits.
At letATwork revision II you can select either TTL or RS232 level on the PE0 / PE1 output pins by setting jumpers.
A general view over letATwork is provided by the following block sketch:
Because of the special qualities of the 4 layer design the
letATwork IIis especially well suitable for the new ATmega128 (which can be clocked up to 16 MHzand is therefore more sensitive to interferences / disturbances).
letATwork IIwith ATmega103-6AI can be purchased in a 3.6864 MHz (for UART use), 4 MHz and a 6 MHz version. All modules are equipped with the 6 MHz version of the ATmega103, so an upgrade is easy.
The ATmega128-16AI version is equipped with 8 MHz or 16 MHz crystal. Please ask for alternative crystal frequencies.
The board is first choice for projects that have to be developed on short time-scales. Applications reach from display controls (especially for memory intensive graphic displays), applications in the telemetry sector, complex controlling tasks up to extending robot instructions.
The ISP Interface
The letATwork has got a 2x5 pin programming connector which enables 100 percent in system programming. A multiplexer at the bottom of the board switches the ATmega pins during programming and a LED indicates programming activity.
Which Programming Adapter can be used?
- The letATwork ISP programmer is a low cost Programming Adapter for the in-system prgrammable Atmel Microcontrollers. It includes the free PonyProg Programming Software (Windows and Linux) for editing and burning of your compiler-produced hex-code files and the commandline tool UISP.
Simply connected the programmer to your computer's parbelow).allel port. It is compatible with farious third party ISP Software (see
- Atmel STK300 compatibel Programmers are also usable to programm the letATwork.
Which Programming Software is useable for letATwork?Each programming tool supporting the SPI-programming-mode of the ATmega can be used; e.g. Atmel AVR Studio, the free PonyProg, the ISP function of the Codevision C Compiler or the BASCOM-AVR basic compiler and several other development environments with ISP are applicable.
- fully SMD-equipped on 4-Layer-PCB-Layout
- 2 x 32 pins in 0.1" pinout (2.54mm spacing) (matches every universal board)
- 45mm x 46mm x 20mm, equipment height: 13mm
- ATmega103-6AI or ATmega128-16AI
- Motorola reset IC
- Multiplexer for ISP
- 78L05, 5 V voltage regulator
- 3.6864, 4 or 6 MHz (mega103) or 8, 16 MHz (mega128) crystal
- 32768 Hz crystal for RTC
- MAX202 for RS232 level
Important: For the ATmega128 please be carefull on setting the fuses to Ext. Crystal/Resonator (e.g. [CKSEL=1111 SUT=11]), NOT to External Clock.
You can find further information on http://www.embedded-inet.com/faq.htm.
- letATwork II Data Sheet [839 kB], ( letATwork I Data Sheet [920 kB] )
- The board includes a CD-ROM with Datasheets, Open Source and free AVR-Tools.
AVR risc architecture 121 commands (mostly single cycle) 6 MIPS at 6MHz 128 KByte program flash, 4KByte SRAM, 4KByte EEPROM (all inside the CPU) Master/Slave SPI interface UART (up to 115000 Baud) real time clock (RTC) with 32 KHz crystal 8 channel 10 Bit A/D converter 6 ports (32 I/O, 8 output, 8 input) extended temperature range external and internal interrupt sources (timer,comp,ext ..) further info@Atmel home page:
ATmega103(L) Summary (12 pages, 09/01)
ATmega103(L) (Complete) (134 page, 09/01)
ATmega103(L) Rev. L Errata (4 pages, 09/01)
ATmega128(L) Preliminary Summary (16 pages, 09/01)
ATmega128(L) Preliminary (Complete) (331 pages, 09/01)
We would appreciate any contribution concerning applications of the letATwork.
- MP3-Player Project by Jesper Hansen
YAMPP-4 ("Yet Another MP-3 Player Project") is using a letATwork for an ATmega103 based MP3-Player.
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