HANSCHIP semiconductor AT24C512CDRG

AT24C512C is a 512 Kbit I²C-compatible serial EEPROM device. It is designed to operate over a supply voltage range of 1.7V to 5.5V with a maximum transfer rate of 1MHz. The operating temperature range is -40°C to +105°C. The device integrates a write protection pin for hardware write protection of the entire memory array.

The serial EEPROM memory is organized as 512 pages of 128 bytes each, for a total of 65536×8 bits. The device provides users with an additional 128-byte identification page for storing sensitive application parameters. Once application data has been written to the identification page, the page can be permanently locked in read-only mode. The AT24C512C also provides a separate memory block containing a factory-programmed 128-bit unique ID. This block is in read-only mode and can be accessed by issuing a specific read command.

The AT24C512C is available in lead-free green packages: SOP, TSSOP, DIP, MSOP, and DFN.

The AT24C512C operates as a slave device and communicates with the master using a two-wire serial interface. The master initiates and controls all read and write operations to the slave on the serial bus; both master and slave can transmit and receive data on the bus.

The serial interface consists of only two signal lines: Serial Clock (SCL) and Serial Data (SDA). Data is always latched into the AT24C512C on the rising edge of SCL and always output from the device on the falling edge of SCL. Both the SCL and SDA pins incorporate spike suppression filters and Schmitt triggers to minimize the effects of input spikes and bus noise.

All commands and data are transmitted MSB first. During bus communication, one bit of data is transferred per clock cycle. After eight bits have been transferred, the receiving device must respond with an ACK or NACK bit during the ninth clock cycle generated by the master. Therefore, nine clock cycles are required to transfer one byte of data. There are no unused clock cycles during any read or write operation, so no interruptions or gaps are permitted during data transmission.

During data transfer, the SDA pin must change only while SCL is low, and data must remain stable while SCL is high. If the SDA pin changes while SCL is high, a Start or Stop condition occurs. The number of data bytes transferred between Start and Stop conditions is unlimited and is determined by the master.

A Start condition is a high-to-low transition on the SDA pin while the SCL pin is held at a stable logic 1. A Start condition must precede any command, as the master uses it to initiate any data transfer sequence. The AT24C512C continuously monitors the SDA and SCL pins for a Start condition; the device will not respond unless a Start condition is issued.

A Stop condition is a low-to-high transition on the SDA pin while the SCL pin is held at a stable logic 1. A Stop condition terminates communication between the AT24C512C and the master. A Stop condition at the end of a write command triggers the internal EEPROM write cycle. Otherwise, the AT24C512C returns to standby mode after receiving a Stop condition.

After receiving each data byte, the AT24C512C must acknowledge to the master that the byte was received successfully. This is accomplished by the master first releasing the SDA line and providing the ACK/NACK clock pulse (the ninth clock cycle of each byte). During the ACK/NACK clock cycle, the AT24C512C must output a logic 0 as acknowledgment throughout the entire clock cycle, such that the SDA line must remain at a stable logic 0 throughout the entire high period of the clock cycle.

The device features a low-power standby mode, which is enabled: (1) at power-up; (2) after a Stop condition is received during a read operation; (3) after any internal operation is complete.

Following a protocol interruption, power loss, or system reset, any two-wire device can be reset by: (1) creating a Start condition; (2) clocking nine cycles; (3) creating another Start condition followed by a Stop condition.

The AT24C512C integrates a Power-On Reset (POR) circuit to prevent inadvertent operations during power-up. During a cold power-up, the device will not respond to any commands until the supply voltage reaches the internal power-on reset threshold.

• Supply voltage range: 1.7V to 5.5V
• Two-wire serial interface, I²C compatible
• Compatible with 400kHz and high-speed 1MHz transfer rates
• Byte and page (up to 128 bytes) write modes
• Partial page write supported
• Self-timed write cycle (3ms max)
• Hardware write protection for entire memory array
• Additional 128-byte writable lockable page and 128-bit unique ID
• Schmitt trigger inputs with filtering for noise suppression
• Low operating current
• Write current: 1mA max
• Read current: 0.5mA max
• Standby current: 1μA max
• High reliability
• Endurance: 2,000,000 write cycles
• Data retention: 200 years
• ESD protection (HBM): 6000V
• Operating temperature range: -40°C to +105°C
• Green package options (RoHS compliant, lead-free/halogen-free)
• SOP, TSSOP, DFN, MSOP, DIP