High Tech ATmega103 Board

The Atmel ATmega103 is one of the most powerful 8bit micro controllers. It is available in a TQFP casing, so we took the chance to mount it on 4.5 x 4.5 cm, add a reset circuit, an "in system programming" (ISP) socket and 5V voltage regulator.

This board is not just an adapter but a complete motherboard for the ATmega 103. 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 and convince yourself - simply letATwork:

  letATwork board


The ISP connector

letATwork programming adapter 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?

Which Programming Software is useable for letATwork?

Each programming tool supporting the SPI-programming-mode of the ATmega can be used. The official ATMEL AVR ISP - Program, the free available PonyProg Software, the ISP function of the BASCOM-AVR basic compiler and several other development environments with ISP suit excellently.


The pin connectors

All Atmel ATmega 103 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.

A general view over letATwork is provided by the following block sketch:

letATwork block scheme

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. letATwork 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.


Technical Data

    letATwork - Board

  • fully SMD-equipped (two sided)
  • 2 x 32 pins in 0.1" pinout (2.54mm spacing) (matches every universal board)
  • 45mm x 45mm x 19mm, equipment height: 13mm
  • equippment:
    • ATmega103-6AI
    • Motorola reset IC
    • Multiplexer for ISP
    • 78L05 , 5 V voltage regulator
    • 3.6864, 4 or 6 MHz crystal
    • 32768 Hz crystal for RTC
    • optional: 1-8 Mbit data flash (Atmel 45Dxx series)

  • letATwork Manual (920 kB)
  • The board includes a CD-ROM with Open Source and free AVR-Tools.
  letATwork front  

  letATwork rear  

The ATmega103-6AI

  • 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) Preliminary Summary (302 kB)
    ATmega103(L) Preliminary (Complete) (1.93 MB)


    We would appreciate any contribution concerning applications of the letATwork.
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