Features

– Software Procedure to Verify Write Protect Status

– 2.5 (V

– Endurance: 1 Million Write Cycles

– Data Retention: 100 Years

Description

The AT34C02C provides 2048 bits of serial electrically-erasable and programmable

read only memory (EEPROM) organized as 256 words of 8 bits each. The first-half of

the device incorporates a permanent and a reversible software write protection feature

while hardware write protection for the entire array is available via an external pin.

Once the permanent software write protection is enabled, by sending a special com-

mand to the device, it cannot be reversed. However, the reversible software write

protection is enabled and can be reversed by sending a special command. The hard-

ware write protection is controlled with the WP pin and can be used to protect the

entire array, whether or not the software write protection has been enabled. This

allows the user to protect none, first-half, or all of the array depending on the applica-

tion. The device is optimized for use in many industrial and commercial applications

where low-power and low-voltage operations are essential. The AT34C02C is avail-

able in space saving 8-lead JEDEC SOIC and 8-lead TSSOP packages and is

accessed via a Two-wire serial interface. It is available in 2.5V (2.5V to 5.5V).

Table 1. Pin Configurations

Pin Name

Function

A0 - A2

Address Inputs

SDA

Serial Data

SCL

Serial Clock Input

WP

Write Protect

Two-wire

Automotive

Temperature

Serial EEPROM

with Permanent

and Reversible

Software Write

Protect

2K (256 x 8)

AT34C02C

Rev. 5242B–SEEPR–01/09

8-lead SOIC

1

2

3

4

8

7

6

5

A0

A1

A2

GND

VCC

WP

SCL

SDA

8-lead TSSOP

1

2

3

4

8

7

6

5

A0

A1

A2

GND

VCC

WP

SCL

SDA