The model " AT24C02D-MAHM-T " is part of the Atmel (now acquired by Microchip Technology) brand, specifically from the AT24C02 series, which are 2-kilobit (256-byte) I²C EEPROM ( Electrical ly Erasable Programmable Read-Only Memory ) devices. These EEPROMs are used in a variety of applications requiring non-volatile data storage, such as storing configuration settings, calibration data, and small amounts of program code.
The "D" in the model name usually signifies a "TSSOP" package type, which refers to a Thin Shrink Small Outline Package. The "MAHM-T" suffix typically represents specific details regarding the packaging and tape & reel options for surface-mount technology (SMT) parts.
Below is a comprehensive breakdown of the pin functions and specifications of the AT24C02D-MAHM-T, in a table format with all the pins and their respective functions.
AT24C02D-MAHM-T Pinout Description
The AT24C02D-MAHM-T comes in an 8-pin package. Here is a detailed description of each pin:
Pin Number Pin Name Pin Function Description 1 A0 Address Bit 0 (LSB) - Part of the 3-bit memory address. This pin is used to select the lower 128 bytes of the memory. It can be grounded or connected to Vcc for different configurations. 2 A1 Address Bit 1 - Part of the 3-bit memory address. Used in conjunction with A0 to select the next 128 bytes of memory. Can be grounded or connected to Vcc for various addressing. 3 A2 Address Bit 2 (MSB) - Another bit of the memory addressing. This pin helps in selecting the upper 128 bytes of memory. 4 SDA Serial Data - This is the data line for I2C communication. It is used to transfer data to and from the EEPROM. SDA is bidirectional and must be connected to the data bus. 5 SCL Serial Clock - The clock line for I2C communication. It synchronizes the data transfer over the SDA line. 6 WP Write Protect - This pin can be used to disable writing to the EEPROM memory for protection. When this pin is tied high (Vcc), writing is disabled. If it is low (GND), writing is enabled. 7 GND Ground - This is the reference ground for the entire device. Connect this pin to the ground of the system. 8 VCC Supply Voltage - This pin is the power supply input for the EEPROM, typically 2.7V to 5.5V depending on the operating conditions.Pin Function Summary Table
Pin Function Description Details A0 Address Bit 0 (LSB) Used to select memory addresses; connected to GND or Vcc for address configuration. A1 Address Bit 1 Defines part of the address in combination with A0. A2 Address Bit 2 (MSB) Part of the address system for accessing memory. SDA Serial Data I2C data line, bidirectional, used for transferring information. SCL Serial Clock I2C clock line to synchronize data transfer. WP Write Protect When high, writing is disabled to prevent accidental data changes. GND Ground Connects the device to the system ground. VCC Supply Voltage Provides power to the device, usually 2.7V to 5.5V.Frequently Asked Questions (FAQs)
Q: What is the AT24C02D-MAHM-T? A: The AT24C02D-MAHM-T is a 2Kb (256 x 8 bits) I2C EEPROM from Atmel (Microchip), used for non-volatile data storage. Q: What is the maximum operating voltage for the AT24C02D-MAHM-T? A: The operating voltage for the AT24C02D-MAHM-T ranges from 2.7V to 5.5V. Q: How is data read from the AT24C02D-MAHM-T? A: Data is read from the AT24C02D-MAHM-T via the I2C communication protocol, using the SDA and SCL pins. Q: Can the AT24C02D-MAHM-T be used for storing large amounts of data? A: The AT24C02D-MAHM-T is best for small data storage, as it holds only 2KB of data (256 bytes). Q: How can the write protection feature be activated? A: The WP pin must be connected to VCC to activate write protection and prevent data modification. Q: What is the significance of the A0, A1, and A2 pins? A: The A0, A1, and A2 pins are used to select one of the eight possible memory pages for addressing data. Q: What happens if I do not connect the WP pin? A: If the WP pin is not connected, the memory can be written to, depending on the voltage level of the pin. Q: How is data written to the AT24C02D-MAHM-T? A: Data is written through the I2C bus, with the SDA pin carrying the data and the SCL pin providing synchronization. Q: Can the AT24C02D-MAHM-T be used in 3.3V circuits? A: Yes, the AT24C02D-MAHM-T can operate in 3.3V circuits as long as the voltage is within the specified range (2.7V to 5.5V).Q: What is the maximum clock frequency for I2C communication with the AT24C02D-MAHM-T?
A: The AT24C02D-MAHM-T supports standard mode I2C speeds up to 100 kHz and fast mode up to 400 kHz.Q: What is the role of the SDA and SCL pins?
A: The SDA pin is used for data transmission and reception, while the SCL pin is used to synchronize the data transfer.Q: Is the AT24C02D-MAHM-T compatible with other I2C EEPROMs?
A: Yes, it is compatible with other I2C EEPROMs, as it uses standard I2C communication.Q: What should be the state of the A0, A1, and A2 pins for the AT24C02D-MAHM-T to function properly?
A: The A0, A1, and A2 pins should be configured to select the correct address. Typically, these pins can be connected to GND or VCC.Q: How can I check if the AT24C02D-MAHM-T is working correctly?
A: You can communicate with the device via the I2C interface and verify the read and write operations.Q: What is the maximum number of AT24C02D-MAHM-T devices that can be connected to a single I2C bus?
A: Up to 8 devices can be connected, as the address space is 8-bit, providing 8 possible device addresses.Q: What is the write cycle time for the AT24C02D-MAHM-T?
A: The write cycle time for the AT24C02D-MAHM-T is typically 5 ms.Q: What is the storage capacity of the AT24C02D-MAHM-T?
A: The AT24C02D-MAHM-T has a total storage capacity of 2Kb (256 x 8 bits).Q: Is the AT24C02D-MAHM-T electrically erasable?
A: Yes, the AT24C02D-MAHM-T is an EEPROM, which means it is electrically erasable and reprogrammable.Q: Can the AT24C02D-MAHM-T be used in automotive applications?
A: Yes, as long as the device is operated within its specified voltage and temperature ranges, it can be used in automotive applications.Q: What are the key benefits of using the AT24C02D-MAHM-T?
A: Key benefits include non-volatile memory storage, small form factor, low power consumption, and compatibility with I2C protocols for easy integration into a wide range of applications.This detailed explanation ensures a full understanding of the AT24C02D-MAHM-T's pinout, its features, and common queries about its operation and integration into systems.
