Order No.: crumb644-1.1
Availability: on stock

Price:  12.90 EUR

incl. VAT excl. shipping

Crystal Frequency

Preload Bootloader  


Questions on this product?

Use our Skype-Chat or enter your question and email address in the field below.

Atmel AVR ATmega644P microcontroller module with USB UART and RS485 transceiver.

Crumb644 V1.1 AVR ATmega Module

Crumb644 V1.1 - Atmel AVR ATmega644P microcontroller module with USB UART and RS485 transceiver.Crumb644 V1.1 - Atmel AVR ATmega644P microcontroller module with USB UART and RS485 transceiver.


Crumb644 V1.1 is a versatile and very compact/small (just 50x18mm size!) microcontroller module with the ATmega644P microcontroller, CP2102 USB UART converter and RS485 transceiver. All microcontroller signals are available on pin headers. A selectable XTAL crystal is included.

The module is shipped without preassembled pinn headers, since everybody has different preferences or requirements. A Connector Kit with a suitable set of pin headers and receptacles can be ordered optionally.

You can find further information in the Infosheet.

Technical Details

  • ATmega644P (64k Flash, 4k SRAM, 4k EEPROM)
  • Interfaces: 2xUSART, SPI, I2C/TWI, 32x IO Pins
  • Peripherals:2x 8 Bit / 1x 16 Bit Timer mit PWM/Capture/Compare, 8ch. 10 Bit ADC, Analog Comparator, Watchdog, Brownout, Sleep/Powerdown Mode
  • 6-Pin ISP interface with standard pinout
  • CP2102 USB UART converter at USART0
  • SN75ALS176 RS485 transceiver at USART1
  • selctable XTAL crystal frequency
  • Connectors: 2x 20-pin with all processor signals, 1x 5-pin with USB and RS485 signals, 1x 6-pin ISP, mini USB-B (5-pin)
  • 2.54mm (1/10inch) pin grid
  • Size: 50.8mm x 17.78mm


  • Infosheet
  • Schematic Diagram
  • ATmega644 Datasheet
  • Atmel Studio 7 (incl. Toolchain + Software Framework)
  • CodeVisionAVR C Compiler
  • We also recommend:

    Power-S-501 V1.0

    5V/3.3V/2.5V 500mA Step Down Switching Regulator Converter Module with LM2674.

    Price: 9.90 EUR(*)

    CodeVisionAVR Standard

    Standard license for CodeVisionAVR ANSI C Compiler.

    Price: 178.50 EUR(*)

    (*) Prices incl. VAT excl. shipping.



    We ship world wide with German Post and DHL.

    Shipment with Deutsche Post and DHL.

    Free shipping above €100 order value (only Germany).
    More information.


    PayPal, Wire Transfer. Companies / Institutions in Germany also Invoice. More on this.

    Logo 'PayPal empfohlen'


    Wir sind Mitglied im Händlerbund. Erfahren Sie hier mehr darüber.

    Mitglied im Händlerbund