AT24HC02BN-SH-T Atmel, AT24HC02BN-SH-T Datasheet - Page 10

• Manufacturer Part Number: AT24HC02BN-SH-T
• Description: IC EEPROM 2KBIT 1MHZ 8SOIC
• Manufacturer: Atmel

Specifications of AT24HC02BN-SH-T

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 2K (256 x 8)
• Speed: 400kHz, 1MHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Density: 2Kb
• Interface Type: Serial (2-Wire)
• Organization: 256x8
• Access Time (max): 900ns
• Frequency (max): 400KHz
• Write Protection: Yes
• Data Retention: 100Year
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Package Type: SOIC
• Operating Temp Range: -40C to 85C
• Supply Current: 3mA
• Operating Supply Voltage (min): 1.8V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT24HC02BN-10SU-1.8 SL383; AT24HC02BN-10SU-1.8 SL383

10. Read Operations
Figure 10-2. Byte Write
10
AT24HC02B/04B
Read operations are initiated the same way as write operations with the exception that the
read/write select bit in the device address word is set to “1”. There are three read operations:
current address read, random address read and sequential read.
CURRENT ADDRESS READ: The internal data word address counter maintains the last
address accessed during the last read or write operation, incremented by one. This address
stays valid between operations as long as the chip power is maintained. The address “roll over”
during read is from the last byte of the last memory page to the first byte of the first page. The
address “roll over” during write is from the last byte of the current page to the first byte of the
same page.
Once the device address with the read/write select bit set to “1” is clocked in and acknowledged
by the EEPROM, the current address data word is serially clocked out. The microcontroller does
not respond with an input “0” but does generate a following stop condition (see
page
RANDOM READ: A random read requires a “dummy” byte write sequence to load in the data
word address. Once the device address word and data word address are clocked in and
acknowledged by the EEPROM, the microcontroller must generate another start condition. The
microcontroller now initiates a current address read by sending a device address with the
read/write select bit high. The EEPROM acknowledges the device address and serially clocks
out the data word. The microcontroller does not respond with a “0” but does generate a following
stop condition (see
SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a ran-
dom address read. After the microcontroller receives a data word, it responds with an
acknowledge. As long as the EEPROM receives an acknowledge, it will continue to increment
the data word address and serially clock out sequential data words. When the memory address
limit is reached, the data word address will “roll over” and the sequential read will continue. The
sequential read operation is terminated when the microcontroller does not respond with a “0” but
does generate a following stop condition (see
Figure 10-1. Device Address
11).
Figure 10-4 on page
2K
4K
MSB
MSB
1
1
0
0
11).
1
1
Figure 10-6 on page
0
0
A
A
A
A
A
P
R/W
LSB
R/W
LSB
11).
5192C–SEEPR–01/09
Figure 10-5 on