AT34C02C View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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AT34C02C

Two-wire Automotive Temperature Serial EEPROM with Permanent and Reversible Software Write Protect

Atmel Corporation 

Features

• Permanent and Reversible Software Write Protection for the First-half of the Array

– Software Procedure to Verify Write Protect Status

• Hardware Write Protection for the Entire Array

• Standard-voltage Operation

– 2.5 (VCC = 2.5V to 5.5V)

• Internally Organized 256 x 8

• Two-wire Serial Interface

• Schmitt Trigger, Filtered Inputs for Noise Suppression

• Bidirectional Data Transfer Protocol

• 400 kHz (2.5V and 5.5V) Compatibility

• 16-byte Page Write Modes

• Partial Page Writes Are Allowed

• Self-timed Write Cycle (5 ms max)

• High-reliability

– Endurance: 1 Million Write Cycles

– Data Retention: 100 Years

• 8-lead JEDEC SOIC and 8-lead TSSOP Packages

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

8-lead SOIC

A0 1

A1 2

A2 3

GND 4

8 VCC

7 WP

6 SCL

5 SDA

Two-wire

Automotive

Temperature

Serial EEPROM

with Permanent

and Reversible

Software Write

Protect

2K (256 x 8)

AT34C02C

A0

A1

A2

GND

8-lead TSSOP

1

8

2

7

3

6

4

5

VCC

WP

SCL

SDA

Rev. 5242B–SEEPR–01/09

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