AT24C512C-SSHMEU-T Atmel, AT24C512C-SSHMEU-T Datasheet - Page 10

• Manufacturer Part Number: AT24C512C-SSHMEU-T
• Description: EEPROM SERIAL EEPROM 512K (64KX8) 2-WIRE 1.7V
• Manufacturer: Atmel

Specifications of AT24C512C-SSHMEU-T

• Rohs: yes
• Memory Size: 512 KB
• Organization: 65536 x 8
• Maximum Clock Frequency: 1000 KHz
• Maximum Operating Current: 2 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Interface Type: 2-Wire
• Minimum Operating Temperature: - 40 C
• Operating Current: 2 mA
• Factory Pack Quantity: 100
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 1.7 V

9.
Read Operations
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 one. There are three types of 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.
Once the device address with the read/write select bit set to one is clocked in and acknowledged by the EEPROM, the
current address data word is serially clocked out on the SDA line. The microcontroller does not respond with an zero, but
does generate a following Stop condition (see
Random Read: A Random Read requires an initial byte write sequence to load in the data word address. This is known
as a “dummy write” operation. 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 zero, but does generate a
following Stop condition (see
Figure 9-4 on page
Sequential Read: Sequential Reads are initiated by either a Current Address Read or a Random 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 zero but does generate a
following Stop condition (see
Figure 9-1. Byte Write
Figure 9-2. Page Write
SDA Line
SDA Line
R
S
T
A
R
T
S
T
A
T
M
S
B
M
S
B
Address
Address
Device
Device
11).
W
R
W
T
E
R
W
I
/
W
R
E
R
T
I
/
Figure 9-5 on page
A
C
K
C
A
K
Word Address (n)
Word Address
First
First
Figure 9-3 on page
C
K
A
11).
C
A
K
Word Address (n)
Word Address
Second
Second
11).
C
A
K
C
K
A
Data (n)
Atmel AT24C512C [DATASHEET]
Data
C
K
A
C
K
A
S
O
P
T
Data (n + x)
8720C–SEEPR–7/12
C
A
K
O
S
P
T
10