AT24CS02-WWUUM(2014) Просмотр технического описания (PDF) - Atmel Corporation

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производитель

AT24CS02-WWUUM
(Rev.:2014)

I2C-Compatible (2-wire) Serial EEPROM with a Unique, Factory Programmed 128-bit Serial Number 1-Kbit (128 x 8), 2-Kbit (256 x 8)

Atmel Corporation 

10. Read Operations

Read operations are initiated in 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 four read operations:

 Current Address Read

 Random Address Read

 Sequential Read

 Serial Number 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 one is clocked in and acknowledged by the

EEPROM, the current address data word is serially clocked out. The microcontroller does not respond with an

zero but does generate a following Stop condition.

Figure 10-1. Current Address Read

S

T

R

S

A

E

T

R

A

O

T Device Address D

Data

P

SDA LINE

M

RA

N

S

/C

O

B

WK

A

C

K

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 zero but does

generate a following Stop condition.

Figure 10-2. Random Read

S

W

T

R

A

I

R

T

T Device Address E

Word Address (n)

S

T

R

A

E

R

A

T Device Address D

S

T

O

Data (n)

P

SDA LINE

M

RA

A

S

/C

C

B

WK

K

Dummy Write

A

N

C

O

K

A

C

K

12 AT24CS01/02 [DATASHEET]

Atmel-8815D-SEEPROM-AT24CS01-02-Datasheet_082014

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