FM93C46M8

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Memory

FM93C46M8 is a type of electrically erasable programmable read-only memory (EEPROM) chip manufactured by ST Microelectronics. It is used for storing parameters and other type of data in devices prone to power fluctuations and frequent updates. EEPROM chips are often manufactured as integrated circuits featuring dynamic memory along with a controller and interface circuits.

Application Field

The FM93C46M8 is designed to meet the ever-growing needs of the automotive, industrial, meter reading, and communication markets. The chip provides a wide range of features including an industry standard two-wire serial interface, serial programming, built-in self-erase/write protection, and an 8-bit address counter. It is extremely small, measuring 6 mm × 8 mm, with a maximum capacity of 256 bytes.

The FM93C46M8 is used in a wide range of applications from motor vehicle clusters to medical instruments. Its most notable uses include vehicle fleet tracking, medical device tracking, factory automation, digital water and electricity meters, vending machine tracking, and process control.

Working Principle

The FM93C46M8 features a two-wire serial interface which allows the device to be accessed and programmed by low-voltage microcontrollers. The interface features hardware control of an externally provided start signal, synchronization of communication between the device and the external interface, and an 8-bit transmit / receive shift register with parity bit.

Once initialized, the chip receives commands over the two-wire serial interface, which allows it to write or read data from the internal memory. Data can be written or erased in blocks of up to 16 bytes. The data is stored in the chip’s non-volatile memory, meaning it can retain data even in the event of a power loss.

The built-in self-erase/write protection prevents accidental overwrites or erasures of data. The device is programmed by applying a supply voltage Vcc to the chip, and then sending a series of write commands over the two-wire serial interface. Once data has been written, programming can be disabled by removing the supply voltage.

Conclusion

The FM93C46M8 EEPROM chip is a versatile and reliable memory solution designed for use in automotive, industrial, and communication applications. The chip\'s two-wire serial interface allows it to be easily accessed and programmed by low-voltage microcontrollers. The device is also protected against accidental overwrites or erasures, making it an ideal choice for applications that require reliable data storage.

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