3

Atmel AT24C01C/02C [DATASHEET]

8700F–SEEPR–6/12

3.

Block Diagram

4.

Pin Description

Serial Clock (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge

clock data out of each device.

Serial Data (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open drain driven and may be

wire-ORed with any number of other open drain or open collector devices.

AT24C01C/02C. As many as eight 1-Kbit or 2-Kbit devices may be addressed on a single bus system. See Section 7.

“Device Addressing” on page 9 for more details.

Write Protect (WP): The AT24C01C/02C have a Write Protect pin that provides hardware data protection. The Write

Protect pin allows normal read/write operations when connected to ground (GND). When the Write Protect pin is

Table 4-1.

Write Protect

Start

Stop

Logic

GND

WP

SCL

SDA

Serial

Control

Logic

EN

H.V. Pump/Timing

EEPROM

Data Recovery

Serial MUX

Logic

COMP

LOAD

INC

Data Word

Addr/counter

Y DEC

R/W

LOAD

Device

Address

Comparator

WP Pin

Status

Part of the Array Protected

Atmel AT24C01C and AT24C02C

Full (2K) Array

At GND

Normal Read/Write Operations