Table of Contents
Features.......................................................................................................................... 1
Packages.........................................................................................................................1
Package Types (not to scale).......................................................................................... 2
Description.......................................................................................................................2
System Configuration Using Single-Wire Serial EEPROMs............................................3
Block Diagram................................................................................................................. 3
1. Electrical Characteristics........................................................................................... 6
1.1. Absolute Maximum Ratings
(1)
...................................................................................................... 6
1.2. AT21CS01/11 DC and AC Operating Range................................................................................6
1.3. AT21CS01 DC Characteristics
(1)
..................................................................................................6
1.4. AT21CS11 DC Characteristics
(1)
.................................................................................................. 7
1.5. AT21CS01/11 AC Characteristics.................................................................................................8
2. Pin Descriptions.......................................................................................................11
2.1. No Connect.................................................................................................................................11
2.2. Serial Input and Output...............................................................................................................11
3. Device Operation and Communication....................................................................12
3.1. Single-Wire Bus Transactions.................................................................................................... 12
4. Device Addressing and I
2
C Protocol Emulation...................................................... 18
4.1. Memory Organization................................................................................................................. 18
5. Available Opcodes...................................................................................................20
5.1. EEPROM Access (Opcode Ah)..................................................................................................20
5.2. Security Register Access (Opcode Bh)...................................................................................... 20
5.3. Lock Security Register (Opcode 2h).......................................................................................... 20
5.4. ROM Zone Register Access (Opcode 7h)..................................................................................20
5.5. Freeze ROM Zone State (Opcode 1h)....................................................................................... 21
5.6. Manufacturer ID Read (Opcode Ch).......................................................................................... 21
5.7. Standard Speed Mode (Opcode Dh)..........................................................................................21
5.8. High-Speed Mode (Opcode Eh)................................................................................................. 21
6. Write Operations......................................................................................................22
6.1. Device Behavior During Internal Write Cycle............................................................................. 22
6.2. Byte Write...................................................................................................................................22
6.3. Page Write..................................................................................................................................23
6.4. Writing to the Security Register..................................................................................................23
6.5. Locking the Security Register.....................................................................................................24
6.6. Setting the Device Speed...........................................................................................................25
AT21CS01/AT21CS11
© 2017 Microchip Technology Inc.
Datasheet
DS20005857A-page 4