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Memory: AT25128B-MAHL-E application field and working principle

The AT25128B-MAHL-E is a 2-wire, 2.7 µA to 5.5 V Serial EEPROMs series. It is an 8-kbit serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It provides Serial Peripheral Interface (SPI) and I2C compatible serial-bus interfaces offering a range of options to match system requirements. As part of the Atmel® serial EEPROM family, this device is designed to meet the needs of low-power, low-voltage operation systems, such as handheld and battery-powered applications.

The serial data is communicated on the Serial Data Input (SDI) and Serial Data Output (SDO) pins. The Serial Clock (SCK) pin is used to clock in the data serially. The chip select (CS), also known as the Slave Select (SS) or the Enable (E) pin, is used to select the device. In addition, the EEPROM uses the SDA and SCL pins for an I2C compatible interface option.

Application of AT25128B-MAHL-E

The AT25128B-MAHL-E series is well-suited for Industrial, Consumer, Medical, Automotive and other space-constrained applications. The device is compliant to JEDEC standard and is RoHS-compliant for use in Green systems products. The series provides a range of options, such as an optional OTP (One-Time Programmable) version and a “Power-Fail” version. This device is offered in several packages including an 8-pin PDIP, 8-pin SOIC, 8-pin TSSOP, and 8-pin ULTRA small TSSOP.

Working Principle of AT25128B-MAHL-E

The AT25128B-MAHL-E is an 8K EEPROM, with a 2.7μA to 5.5V Serial EEPROMs series. It is a two-wire I2C/SPI interface serial EEPROM, with two different operation modes. The write/erase operation is done through a standard two-wire serial interface such as I2C or SPI. The read operation is done through a single-wire I2C/SPI interface.

When using the SPI protocol, the data is clocked in by the SCK pin, in a standard MOSI/MISO (Master Output, Slave Input) clocking scheme. The device is selected with the CS (Chip Select) pin. The data that needs to be written is clocked in through the MOSI pin, and the data that is to be read is received by the device through the MISO pin. The data to be written or read is written or read, one byte at a time.

The device is also compliant with the I2C protocol. The normal operation of the I2C interface is similar to the SPI interface, except that both directions of data transmission are handled by one single wire in the I2C protocol. The device is also compatible with the SMBus protocol, which is a more enhanced version of the I2C protocol.

Conclusion

The Atmel AT25128B-MAHL-E is an 8-kbit serial electrically erasable programmable read-only memory (EEPROM) that has both I2C and SPI interfaces. It is designed to handle low power, low-voltage applications and is found in a variety of industrial, consumer, medical, and automotive applications. The device is compliant to JEDEC standard, is RoHS compliant, and is a great option for a variety of applications.

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