Interface and connectivity

Proven IO expansion technology

NXP's GPIOs provide reliable IO expansion for most microprocessor families, allowing designers to save GPIOs on microprocessors for other important functions. Devices are about to become available for SPI and I2C bus interface and with 8 or 16 IOs.

Key features and benefits

  • Easily adds I/Os via I2C or SPI-bus for input/ouput, key scan or to control LEDs
  • Combats "Feature Creep" by expanding I/O ports instead of requirement for new µC
  • Allows seamless migration to newer µC and still keeps the same peripherals
  • Eliminates costly congested PCB since a trace or wire is not needed for each signal
  • Automotive AEC-Q100 compliant qualification for highest reliability and robustness
  • IO expansion for 8 or 16 inputs and/or outputs
  • I2C and/or SPI-bus interface
  • Interrupt output and/or Reset input
  • Up to 18 V tolerant inputs
  • Maskable inputs

Key applications

  • Basestation – discretes focus / transceiver board
  • Digital media adapters
  • LCD display – discretes focus
  • PCI analog / DVB-T stereo TV receiver
  • UMA-enabled GSM/GPRS/EDGE VAS Phone (6100)

Design tools & Assets

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Training & events

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Descriptive summary

NXP's GPIO are useful in any application where the number of GPIOs on the microprocessor is not sufficient. With the requirement for more functionality and features such as LED control, fan control, push button input control, system monitoring or humidity sensing, the relatively small numbers of GPIOs on microprocessors are becoming a limiting factor. Adding IO expansion with NXP's GPIOs overcomes these limitations.

Our GPIO are available with either I2C bus SPI bus interface and offer from 8 to 16 IOs. Some of the products feature an additional INT (INTerrupt) output and/or a REST or OE (Output Enable) input. The output is used to signal the microcontroller when any of the inputs change state (1 to 0, or 0 to 1). The RESET input can be used to initialize the device to its default state without de-powering it.


Demo boards

Board imageType numberDescriptionStatusQuick access
OM13320I²C Fm+ Development Board Kit OM13320ProductionOrder demo boards
OM13488Universal 8-bit GPIO Daughter Card for the Fm+ Development BoardProduction
OM13489Universal 16-bit GPIO Daughter Card for the Fm+ Development BoardProduction
OM13491Surface Mount to DIP Evaluation Board OM13491Production
OM13492Surface Mount to DIP Evaluation Board OM13492Production
OM13493Surface Mount to DIP Evaluation Board OM13493Production
OM13494Surface Mount to DIP Evaluation Board OM13494Production
OM13495Surface Mount to DIP Evaluation Board OM13495Production
OM13496Surface Mount to DIP Evaluation Board OM13496Production
OM13497Surface Mount to DIP Evaluation Board OM13497Production
OM6275NXP I²C demonstration board 2005-1 kitProductionOrder demo boards

DIV Table experiment (Column Based)

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