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This product has been discontinued. Please contact BiPOM to have this product custom manufactured for you.

MULTI-IO/51-A is a Microcontroller System and I/O Expander based on the ATMEL AT89C51ED2 Flash micro-controller.
Ideal for Internet of Things (IoT) applications.

MULTI-IO/51-A - 8051 microcontroller board with multiple I/O porta

MULTI-IO/51-A is a semi-custom board that supports various options such as any combination of:

  • Digital Inputs/Outputs
  • Open-collector outputs
  • Optoisolated inputs
  • Reed Relay contacts
Please contact the factory for more details.


  • ATMEL AT89C51ED2 8051 compatible Microcontroller
  • 64K Flash Memory , 2K RAM, 2K internal EEPROM
  • 9-sources of 4-level Interrupts, Three 16-bit Timer/Counters
  • Programmable Counter Array with High Speed Output, Compare/Capture, Pulse Width Modulator (PWM)
  • Programmable Enhanced UART Serial Channel, RS232 Serial Port
  • Hardware SPI Serial Interface, Programmable Watchdog Timer, Brownout Detector
  • 120 general purpose I/O pins using 82C55 I/O Expanders
  • Serial EEPROM socket for AT24C04 and similar I2C EEPROM's
  • In-circuit Programming/Debugging of the micro-controller through the serial port
  • Expansion bus interface to low-cost peripheral boards
  • Serial cable, serial downloader, online technical manual and schematics
  • 5V DC Operation