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Using a timer and I/O pins to interface 8051 MCUs with I?C serial EEPROMs

Posted: 02 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MCU? serial EEPROM? interface bus?

The 24XXX series serial EEPROMs from Microchip Technology support a bidirectional, 2-wire bus and data transmission protocol. The bus is controlled by the MCU (master), which generates the serial clock, controls the bus access and generates the start and stop conditions, while the 24XXX serial EEPROM works as slave. The 24XXX serial EEPROMs are I?C compatible and have maximum clock frequencies ranging from 100kHz to 1MHz.

The main features of the 24XXX serial EEPROMs are:

  • 2-wire serial interface bus, I?C compatible
  • EEPROM densities from 128bit to 512Kbit
  • Bus speed from 100kHz to 1MHz
  • Voltage range from 1.7V to 5.5V
  • Low power operation
  • Temperature range from -40C to +125C
  • Over 1,000,000 erase/write cycles
  • Up to eight devices may be connected to same bus.

    This application note is part of a series that provide source code to help the user implement the protocol with minimal effort.

    View the PDF document for more information.

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