25LC1024-I-SM Detailed explanation of pin function specifications and circuit principle instructions

The part number " 25LC1024-I/SM " refers to a serial EEPROM ( Electrical ly Erasable Programmable Read-Only Memory ) made by Microchip Technology Inc.

Here’s a detailed explanation of the pin function specifications and circuit principle:

Package Type and Pin Count:

The "25LC1024-I/SM" is typically packaged in an 8-pin SOIC (Small Outline Integrated Circuit) package. The pin configuration and functionality are as follows:

Pinout and Pin Function Table (8-Pin SOIC Package)

Pin Number Pin Name Pin Function Description 1 CS (Chip Select) This pin is used to activate the chip. A low logic level on this pin enables communication with the device. 2 SO (Serial Output) This pin serves as the data output for the serial interface . Data is transmitted from the EEPROM to the microcontroller or host device. 3 VSS (Ground) This pin is the ground (0V) connection for the device. 4 SCK (Serial Clock ) This pin is used to provide the clock signal for the serial interface. It synchronizes the data transfer between the EEPROM and the host device. 5 SI (Serial Input) This pin serves as the data input for the serial interface. Data is received from the host device to the EEPROM via this pin. 6 WP (Write Protect) This pin is used to enable or disable the write protection feature of the EEPROM. A low level on this pin disables write protection. 7 HOLD (Hold) This pin can be used to temporarily pause communication with the EEPROM without losing data. A low logic level on this pin holds the clock signal. 8 VCC ( Power Supply) This pin provides the power supply (typically 2.5V to 5.5V) to the EEPROM chip.

Functionality and Circuit Principle:

The 25LC1024-I/SM is a 1 Mbit (128 KB) EEPROM, and it communicates with external devices (e.g., microcontrollers or processors) using the Serial Peripheral Interface (SPI) protocol. This communication allows the EEPROM to store and retrieve data from its memory cells.

The EEPROM operates using a clock (SCK) that controls the timing of data transfer, with Chip Select (CS) enabling the chip's operation. The data is transferred bit by bit via the Serial Data Input (SI) and Serial Data Output (SO) pins. Write Protection (WP) and Hold (HOLD) pins offer additional control over write access and communication pausing, respectively.

FAQ (Frequently Asked Questions)

What is the function of the CS pin in the 25LC1024-I/SM? The CS (Chip Select) pin is used to activate the EEPROM for communication. A logic low on this pin enables communication with the device. What happens if the WP pin is set low? If the WP (Write Protect) pin is set low, the EEPROM will allow write operations. If set high, write operations are disabled, protecting the memory contents. Can I use the 25LC1024-I/SM with a 3.3V power supply? Yes, the 25LC1024-I/SM can operate with a supply voltage between 2.5V and 5.5V, so a 3.3V supply is within its operational range. What is the function of the SCK pin? The SCK (Serial Clock) pin provides the clock signal for the SPI communication. It synchronizes data transfer between the EEPROM and the host device. How does the HOLD pin work? The HOLD pin can be used to pause communication temporarily without losing the data transfer state. A low level on the HOLD pin pauses the clock signal. What is the maximum data transfer rate of the 25LC1024-I/SM? The maximum clock speed for the SPI interface of the 25LC1024-I/SM is typically 10 MHz, allowing fast data transfer. Is there an addressable memory range for the 25LC1024-I/SM? Yes, the 25LC1024-I/SM has a 1 Mbit memory, and it uses 16-bit addressing, which means it can address up to 128K bytes of data. How many memory bytes are available in the 25LC1024-I/SM? The 25LC1024-I/SM provides 128KB (1024 Kbits) of EEPROM storage. Can the EEPROM be reprogrammed? Yes, the 25LC1024-I/SM EEPROM is electrically erasable and programmable, meaning its contents can be rewritten multiple times.

What is the purpose of the VSS pin?

The VSS pin is the ground reference pin. It connects to the ground of the power supply for proper operation of the chip.

How is data read from the 25LC1024-I/SM?

Data is read from the EEPROM through the SPI interface by sending a READ command followed by the address from which data should be retrieved.

What is the voltage range of the 25LC1024-I/SM?

The 25LC1024-I/SM operates with a supply voltage between 2.5V and 5.5V, making it compatible with various systems.

What is the WRITE command format for this EEPROM?

The WRITE command involves sending a command byte, followed by the memory address to write to, and then the data bytes to be written.

Can the 25LC1024-I/SM be used in high-speed applications?

Yes, with a high SPI clock rate (up to 10 MHz), the 25LC1024-I/SM can be used in many high-speed applications that require fast data storage and retrieval.

What is the typical power consumption of the 25LC1024-I/SM?

The power consumption is typically low, with active current consumption around 1mA, making it suitable for low-power applications.

What is the endurance of the 25LC1024-I/SM?

The 25LC1024-I/SM has a typical endurance of up to 1 million write cycles per memory cell.

How is the EEPROM initialized for use?

Initialization involves configuring the SPI interface and ensuring proper power supply connections to the VCC and VSS pins.

What kind of data protection does the 25LC1024-I/SM offer?

The device offers write protection via the WP pin to prevent accidental writes to the EEPROM memory.

What are the common applications for the 25LC1024-I/SM?

The EEPROM is commonly used for storing configuration settings, calibration data, or any data that needs to be retained after power is lost.

Is the 25LC1024-I/SM compatible with both 3.3V and 5V systems?

Yes, the 25LC1024-I/SM is designed to be compatible with both 3.3V and 5V logic systems.

This detailed explanation covers the key features and FAQs related to the 25LC1024-I/SM. If you need more information or specific examples, feel free to ask!