24AA64T-I/OT Integrated Circuits (ICs)

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24AA64T-I/OT is one of the devices from the family of Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It is a nonvolatile memory component used for storing data and instructions. Manufactured by Microchip, 24AA64T-I/OT possesses a wide range of features which make it suitable for various applications. In this article, we will discuss the application field and working principle of 24AA64T-I/OT.

Application field

24AA64T-I/OT belongs to the 2-Wire Serial EEPROM family. It has wide voltage range of 1.8V to 5.5V, making it ideal for a variety of applications. It is mainly used in embedded systems, industrial equipment, health & medical instruments, remote control systems, etc.

The device offers a high flexibility to the user. It has two operating modes, one with a Bus Wire (BW) mode which enables communication through an I2C bus and the second with Bus Sense (BS) mode where the device can be controlled in a single- and multi-master environment. This is particularly advantageous in applications where it is necessary to monitor or sense a connected field device.

24AA64T-I/OT also features a wide operating temperature range of -40°C to 85°C and fast page-write time of 1 msec. Hence, the device can be used in harsh and demanding applications. Furthermore, the device includes a step-up circuit to promote higher programming speed, reducing the overall time needed for the operation.

Working principle

24AA64T-I/OT comprises 64Kbits of EEPROM and operates in both I2C and SPI bus modes, along with an integrated Address Latch. The device is designed to provide an ideal memory solution to applications that require low-power operation, minimum operation time and wide temperature range. It offers an array of internal operation options such as Auto-Addressed Program/Erase, Random Entry Read/Write and held page write.

When operating in I2C bus mode, the device can be addressed using 8- or 16-bit formats. The first 7 bits of the address are fixed and the 8th bit is a write/read (WR) bit. In the 16-bit format, the 8th and 15th bit are the direction bits, while the other bits are the address. In SPI bus mode, the device is addressed using up to 32-bits. The device also has byte-addressable control commands. When operated in I2C mode, an integrated Address Latch is used to store the device address.

The device is programmed and erased in-circuit, with no need for external components and supplies. The programming algorithm consists of the following steps. First, a signal is sent to the device to set up the address pointer. Then, the data to be written is serially sent to the device. This data is latched in the internal data register and then written to the EEPROM array. The next step is to send the control bits that initiate programming operation. Finally, the device sends back an acknowledge bit and the completion of the programming operation.

Erasing the device requires similar steps. A signal is sent to the device to set up the address pointer. Then, the control bits are sent to the device to initiate the erase operation. The following step is to provide the voltage pulse and finally, the device sends an acknowledgement bit as the completion of erasing.

Conclusion

24AA64T-I/OT is an advanced and versatile device with a wide range of features. It is ideal for applications requiring low-power, fast operation and wide temperature range. The device operates in both I2C and SPI bus mode and the programming algorithm is straightforward and easy to use.

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