1-Kbit Single-Wire, I/O Powered Serial EEPROM with Unique 64-Bit Serial Number

1 Pin Descriptions

1.1 Serial Input and Output

2.1 System Configuration Using Single-Wire Serial EEPROMs

2.2 Block Diagram

3 Electrical Characteristics

3.1 Absolute Maximum Ratings

3.2 DC and AC Operating Range

3.3 AT21CS01 DC Characteristics⁽¹⁾

3.4 AT21CS11 DC Characteristics⁽¹⁾

3.5 AT21CS01/AT21CS11 AC Characteristics

4 Device Operation and Communication

4.1 Single-Wire Bus Transactions

5 Device Addressing and I²C Protocol Emulation

5.1 Memory Organization

6 Available Opcodes

6.1 EEPROM Access (Opcode Ah)

6.2 Security Register Access (Opcode Bh)

6.3 Lock Security Register (Opcode 2h)

6.4 ROM Zone Register Access (Opcode 7h)

6.5 Freeze ROM Zone State (Opcode 1h)

6.6 Manufacturer ID Read (Opcode Ch)

6.7 Standard Speed Mode (Opcode Dh)

6.8 High-Speed Mode (Opcode Eh)

7 Write Operations

7.1 Device Behavior During Internal Write Cycle

7.4 Writing to the Security Register

7.5 Locking the Security Register

7.6 Setting the Device Speed

8 Read Operations

8.1 Current Address Read within the EEPROM

8.2 Random Read within the EEPROM

8.3 Sequential Read within the EEPROM

8.4 Read Operations in the Security Register

8.5 Manufacturer ID Read

9.1 ROM Zone Size and ROM Zone Registers

9.2 Programming and Reading the ROM Zone Registers

9.3 Device Response to a Write Operation Within an Enabled ROM Zone

10 Device Default Condition from Microchip

11 Packaging Information

11.1 Package Marking Information

12 Revision History

Microchip Information

The Microchip Website

Product Change Notification Service

Customer Support

Product Identification System

Microchip Devices Code Protection Feature

Quality Management System

Worldwide Sales and Service

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