AT21CS01
Single-Wire, I/O Powered Serial EEPROM with a
Unique, Factory Programmed 64-bit Serial Number
1-Kbit (128 x 8)
DATASHEET
Features
Low voltage operation
̶
Device is self-powered via 1.7V to 3.6V pull-up voltage on the SI/O line
Internally organized as 128 words of 8 bits each (1-Kbit)
Single-Wire serial interface with I
2
C protocol structure
̶
̶
̶
Device communication is achieved through a single I/O pin
15.4kbps maximum bit rate in Standard Speed Mode
125kbps maximum bit rate in High Speed Mode
Standard Speed and High Speed Mode options
8-byte Page Write or single Byte Writes allowed
Discovery Response feature for quick detection of devices on the bus
ROM Zone support
̶
Device is segmented into four 256-bit zones, each of which can be
permanently made read-only (ROM)
̶
̶
Lower 8 bytes contains a factory programmed, read-only,
64-bit Serial Number that is unique to all Atmel Single-Wire products
Upper 16 bytes are user-programmable and permanently lockable
256-bit Security Register
Self-timed write cycle (5ms max)
Manufacturer Identification support
̶
Device responds with unique value for Atmel as well as density and revision
information
̶
̶
̶
Endurance: 1,000,000 write cycles
Data retention: 100 years
IEC 61000-4-2 Level 4 ESD Compliant (±8kV Contact, ±15kV Air Discharge)
̶
8-lead SOIC, 3-lead SOT23, and 4-ball Thin WLCSP
High reliability
Green (Lead-free/Halide-free/RoHS Compliant) package options
Die sale options in wafer form and tape and reel
Description
The Atmel
®
AT21CS01 provides 1,024 bits of Serial Electrically Erasable and
Programmable Read-Only Memory (EEPROM) organized as 128 words of 8 bits
each. The device’s software addressing scheme allows up to eight devices to
share a common Single-Wire bus. The device is optimized for use in many
industrial and commercial applications where low-power and low-voltage
operation are essential. Some applications examples include analog sensor
calibration data storage, ink and toner printer cartridge identification, and
management of after-market consumables. The device is available in
space-saving package options and operates with an external pull-up voltage from
1.7V to 3.6V on the SI/O line.
Atmel-8903A-SEEPROM-AT21CS01-Datasheet_082015
Ta b le of C o nte nts
1.
2.
Pin Descriptions and Pinouts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Device Block Diagram and System Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
2.2
Device Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
System Configuration using Single-Wire Serial EEPROMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.
Device Operation and Communication
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1
Single-Wire Bus Transactions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1
Device Reset / Power-up and Discovery Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1.1
Resetting The Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1.2
Device Response Upon Reset or Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.2
Interrupting the Device During an Active Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.3
Data Input and Output Bit Frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.3.1
Data Input Bit Frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.3.2
Start / Stop Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.3.3
Communication Interruptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.3.4
Data Output Bit Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.
5.
Device Addressing and I
2
C Protocol Emulation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1
Memory Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Available Opcodes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
EEPROM Access (Opcode Ah). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Register Access (Opcode Bh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lock Security Register (Opcode 2h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ROM Zone Register Access (Opcode 7h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeze ROM Zone State (Opcode 1h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manufacturer ID Read (Opcode Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Speed Mode (Opcode Dh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Speed Mode (Opcode Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
12
12
12
13
13
13
6.
Write Operations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1
6.2
6.3
6.4
6.5
Device Behavior During Internal Write Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Byte Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Writing to the Security Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locking the Security Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5.1
Device Response to a Write Command on a Locked Device . . . . . . . . . . . . . . . . . . . . . .
6.5.2
Check Lock Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Device Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.1
Standard Speed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.2
High Speed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
14
15
16
17
17
17
18
18
18
6.6
2
AT21CS01 [DATASHEET]
Atmel-8903A-SEEPROM-AT21CS01-Datasheet_082015
7.
Read Operations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.1
7.2
7.3
7.4
7.5
Current Address Read within the EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Random Read within the EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sequential Read within the EEPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read Operations in the Security Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4.1
Serial Number Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manufacturer ID Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
20
20
21
21
22
8.
ROM Zones
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.1
8.2
ROM Zone Size and ROM Zone Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.1
ROM Zone Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming and Reading the ROM Zone Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.1
Reading the status of a ROM Zone Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.2
Writing to a ROM Zone Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.3
Freeze ROM Zone Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device Response to a Write Command Within an Enabled ROM Zone . . . . . . . . . . . . . . . . . . . . . .
23
23
24
24
24
25
26
8.3
9.
Electrical Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9.1
9.2
9.3
9.4
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC and AC Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4.1
Reset and Discovery Response Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4.2
Data Communication Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EEPROM Cell Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device Default Condition from Atmel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
27
27
28
28
28
29
29
9.5
9.6
10. Ordering Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10.1
10.2
Ordering Code Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Ordering Code Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11. Part Markings
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
12. Packaging Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
12.1
12.2
12.3
8S1 — 8-lead SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3ST1 — 3-lead SOT23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4U-6 — 4-ball WLCSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13. Revision History
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
AT21CS01 [DATASHEET]
Atmel-8903A-SEEPROM-AT21CS01-Datasheet_082015
3
1.
Pin Descriptions and Pinouts
Table 1-1.
Pin
Symbol
NC
GND
Pin Descriptions
Asserted
State
—
—
Pin
Type
—
Power
Pin Name and Functional Description
No Connect:
The NC pins are not internally connected. These pins can be
connected to GND or left floating.
Ground:
The ground reference for the power supply. GND should be
connected to the system ground.
Serial Input and Output:
The SI/O pin is an open-drain, bi-directional
input/output pin used to serially transfer data to and from the device.
SI/O
The SI/O pin must be pulled-high using an external pull-up resistor (not to
exceed 4K in value) and may be wire-ORed with any number of other open-
drain or open-collector pins from other devices on the same bus.
The device also uses the SI/O pin as its voltage source by drawing and
storing power during the periods that the pin is pulled high to a voltage level
between 1.7V and 3.6V.
—
Power,
Input/Output
8-lead SOIC
NC
NC
NC
GND
1
2
3
4
8
7
6
5
3-lead SOT23
NC
NC
NC
SI/O
GND
3
1
2
4-ball WLCSP
NC
SI/O
NC
SI/O
GND
NC
Top View
Top View
Top View
Note: Package drawings are not to scale.
4
AT21CS01 [DATASHEET]
Atmel-8903A-SEEPROM-AT21CS01-Datasheet_082015
2.
2.1
Device Block Diagram and System Configuration
Device Block Diagram
Figure 2-1.
Block Diagram
Device
Configuration
Latches
High Voltage
Generation Circuit
Memory
System Control
Module
Device
Power
Extraction
SI/O
EEPROM Array
Row Decoder
Reset
Detection
1 page
Command
Control
Column Decoder
Data Register
Internal
Timing
Generation
Data & ACK
D
OUT
Input/Output Control
D
IN
GND
2.2
System Configuration using Single-Wire Serial EEPROMs
Figure 2-2.
V
PUP
R
PUP
(See Section 9.3 for requirements.)
System Configuration using Single-Wire Serial EEPROMs
V
CC
SI/O
Bus Master:
Microcontroller
SI/O
SI/O
SI/O
Slave 0
AT21CS01
GND
GND
Slave 1
AT21CS01
GND
Slave 7
AT21CS01
GND
AT21CS01 [DATASHEET]
Atmel-8903A-SEEPROM-AT21CS01-Datasheet_082015
5
