AT24MAC402-XHM-T - MICROCHIP TECHNOLOGY

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Standard Serial EEPROM Features

Low-voltage Operation

1.7V Minimum (VCC = 1.7V to 5.5V)

Internally Organized as 256 x 8 (2K)

I2C-compatible (2-wire) Serial Interface

Schmitt Trigger, Filtered Inputs for Noise Suppression

Bi-directional Data Transfer Protocol

400kHz (1.7V) and 1MHz (2.5V, 5.0V) Compatibility

Write Protect Pin for Hardware Data Protection of the Entire Array

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

Array

Software Procedure to Verify Write Protect Status

16-byte Page Write Modes

Partial Page Writes Allowed

Self-timed Write Cycle (5ms max)

High-reliability

Endurance: 1,000,000 Write Cycles

Data Retention: 100 Years

Green Package Options (PB/Halide-free/RoHS Compliant)

8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, and 5-lead SOT23

Die Sale Options: Wafer Form and Tape and Reel

Enhanced Features in the MAC Serial EEPROM Family

Factory-programmed EUI-48 or EUI-64 Compatible Address

Permanently Locked, Read-only Value

Stored in a Separate Memory Area

Guaranteed Unique EUI Address

Custom Programming Services Available

Manage and Program Customer’s IEEE Assigned OUI

Unique Factory-programmed 128-bit Serial Number

Unique for all Atmel® AT24CS, AT93CS, and AT25S Series Serial EEPROMs

Permanently Locked, Read-only Value

Stored in a Separate Memory Area

AT24MAC402 and AT24MAC602

I2C-Compatible (2-wire) 2-Kbit Serial EEPROM with a

Factory-Programmed EUI-48™ or EUI-64™Address

Plus an Embedded Unique 128-bit Serial Number

2-Kbit (256 x 8)

DATASHEET

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

1. Description

The Atmel AT24MAC402 and AT24MAC602 provides 2048 bits of Serial Electrically-Erasable Programmable

Read-Only Memory (EEPROM) organized as 256 words of eight bits each and is accessed via an

I2C-compatible (2-wire) serial interface. In addition, AT24MAC402/602 incorporates an easy and inexpensive

method to obtain a globally unique MAC or EUI address (EUI-48 or EUI-64). AT24MAC402 is an EUI-48

compatible device that contains a 48-bit EUI address, and AT24MAC602 is an EUI-64 compatible device that

contains a 64-bit EUI address.

The EUI-48 and EUI-64 addresses can be assigned as the actual physical address of a system hardware device

or node or it can be assigned to a software instance. These addresses are factory programmed by Atmel and

permanently write protected in an extended memory block located outside of the standard 2-Kbit bit memory

array.

In addition, the AT24MAC402/602 provides the value added feature of a factory-programmed, guaranteed

unique 128-bit serial number located in the extended memory block (same area as the EUI address values).

The serial number is Atmel factory-programmed and permanently write protected. This 128-bit serial number is

compatible with all AT24CS, AT93CS, and AT25S family serial numbers, therefore, providing guaranteed

unique serial numbers for any application that is also using Atmel Serial EEPROMs.

The first-half of the AT24MAC402/602 incorporates a permanent and a reversible software write protection

feature while a hardware write protect feature for the entire array is available via an external pin. The permanent

software write protection is enabled by sending a special command to the device. This protection cannot be

reversed once executed. However, the reversible software write protection can be reversed by sending and

executing a special command. The hardware write protection is controlled by the WP pin state and can be used

to protect the entire array regardless of whether or not the software write protection has been enabled. The

software and hardware write protection features allow the user the flexibility to protect no portion of the memory,

the first-half of the memory, or the entire memory array depending on the specific needs of the application.

The device is optimized for use in many industrial and commercial applications where low-power and

low-voltage operations are essential. The AT24MAC402/602 is available in space saving 8-lead JEDEC SOIC,

8-lead TSSOP, 8-pad UDFN, and 5-lead SOT23 packages. Both devices operate across a wide supply voltage

range from 1.7V to 5.5V VCC.

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

2. Pin Configurations and Pinouts

Figure 1. Pin Configurations

Notes: 1. For use of the 5-lead SOT23, the software A2, A1, and A0 bits in the device address word must be set to zero

to properly communicate with the device since the A2, A1, and A0 pins are not bonded out. Some functionality

is not possible due to these pins not being available. See “Write Protection” on page 15 for more details.

2. Drawings are not to scale.

3. Absolute Maximum Ratings*

Pin Name Function

A0-A

2Address Inputs

SDA Serial Data

SCL Serial Clock Input

WP Write Protect

GND Ground

VCC Power Supply 1

GND

VCC

SCL

SDA

8-pad UDFN

(Top View)

8-lead TSSOP

(Top View)

GND

VCC

SCL

SDA

GND

VCC

SCL

SDA

8-lead SOIC

(Top View)

5-lead SOT23

(Top View)

SCL

GND

SDA

VCC

Operating Temperature . . . . . . . . . . .-55°C to +125°C

Storage Temperature . . . . . . . . . . . . .-65°C to +150°C

Voltage on any pin

with respect to ground . . . . . . . . . . . . . -1.0V to +7.0V

Maximum Operating Voltage . . . . . . . . . . . . . . . 6.25V

DC Output Current . . . . . . . . . . . . . . . . . . . . . . .5.0mA

*Notice: Stresses beyond those listed under “Absolute

Maximum Ratings” may cause permanent damage

to the device. This is a stress rating only and

functional operation of the device at these or any

other conditions beyond those indicated in the

operational sections of this specification is not

implied. Exposure to absolute maximum rating

conditions for extended periods may affect device

reliability.

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

4. Block Diagram

Figure 4-1. Block Diagram

Start

Stop

Logic

Data Word

ADDR/Counter

Row Decoder

Device

Address

Comparator

Data Latches

DOUT / ACK

Logic

Column

Decoder

EEPROM

Array

Serial

Control

Logic

High Voltage

Pump & Timing

128-bit

Serial

Number

Serial MUX

Read

Read/Write

Enable

COMP Load

INC

GND

SCL

SDA

DOUT

DIN

MAC-48

EUI-48

EUI-64

Address

Read

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

5. 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.

Device Addresses (A0, A1, A2): The A0, A1, and A2 pins are device address inputs that are hard wired for the

AT24MAC402/602. As many as eight 2K devices may be addressed on a single bus system. Device addressing

is discussed in detail in Section 9., “Device Addressing” on page 13.

Write Protect (WP): The AT24MAC402/602 has a Write Protect pin that provides hardware data protection.

When the Write Protect pin is connected to ground (GND), normal Read/Write operations to the full array are

possible. When the Write Protect pin is connected to VCC, all write operations to the memory are inhibited, but

read operations are still possible. However, due to capacitive coupling that may appear during customer

applications, Atmel recommends always connecting the WP pins to a known state. When using a pull-up

resistor, Atmel recommends using 10k or less. The write protection operation is summarized in Table 5-1

below.

5.1 Write Protection Modes

Table 5-1. Write Protection Modes

WP Pin Status

Permanent Write Protect

Reversible Write Protect

Part of the Array Write

Protected

VCC — — Full Array (2K)

GND or Floating Not Programmed Not Programmed Normal Read/Write

GND or Floating Programmed — First-half of Array

GND or Floating — Programmed First-half of Array

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

6. Electrical Characteristics

6.1 Pin Capacitance

Table 6-1. Pin Capacitance(1)

Note: 1. This parameter is characterized and is not 100% tested.

6.2 DC Characteristics

Table 6-2. DC Characteristics

Note: 1. VIL min and VIH max are reference only and are not tested.

Symbol Test Condition Max Units Conditions

CI/O Input/Output Capacitance (SDA) 8 pF VI/O = 0V

CIN Input Capacitance (A0, A1, A2, SCL) 6 pF VIN = 0V

Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = 1.7V to 5.5V (unless otherwise noted).

Symbol Parameter Test Condition Min Typ Max Units

VCC Supply Voltage 1.7 5.5 V

ICC1 Supply Current VCC = 5.0V Read at 400kHz 0.4 1.0 mA

ICC2 Supply Current VCC = 5.0V Write at 400kHz 2.0 3.0 mA

ISB1 Standby Current VCC = 1.7V VIN = VCC or VSS 1.0 μA

ISB2 Standby Current VCC = 2.5V VIN = VCC or VSS 2.0 μA

ISB3 Standby Current VCC = 5.5V VIN = VCC or VSS, A0 = VSS 6.0 μA

ILI Input Leakage Current VIN = VCC or VSS 0.10 3.0 μA

ILO Output Leakage Current VOUT = VCC or VSS 0.05 3.0 μA

VIL Input Low Level(1) -0.6 VCC x 0.3 V

VIH Input High Level(1) VCC x 0.7 VCC + 0.5 V

VOL1 Output Low Level VCC = 1.7V IOL = 0.15mA 0.2 V

VOL2 Output Low Level VCC = 3.0V IOL = 2.1mA 0.4 V

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

6.3 AC Characteristics

Table 6-3. AC Characteristics

Note: 1. This parameter is characterized and is not 100% tested.

Figure 6-1. Bus Timing

SCL Serial Clock, SDA: Serial Data I/O

Symbol Parameter

1.7V 2.5V, 5.0V

UnitsMin Max Min Max

fSCL Clock Frequency, SCL 400 1000 kHz

tLOW Clock Pulse Width Low 1.2 0.4 μs

tHIGH Clock Pulse Width High 0.6 0.4 μs

tINoise Suppression Time(1) 100 50 ns

tAA Clock Low to Data Out Valid 0.1 0.9 0.05 0.55 μs

tBUF

Time the bus must be free before a new

transmission can start.(1) 1.3 0.5 μs

tHD.STA Start Hold Time 0.6 0.25 μs

tSU.STA Start Set-up Time 0.6 0.25 μs

tHD.DAT Data In Hold Time 0 0 μs

tSU.DAT Data In Set-up Time 100 100 ns

tRInputs Rise Time(1) 0.3 0.3 μs

tFInputs Fall Time(1) 300 100 ns

tSU.STO Stop Set-up Time 0.6 0.25 μs

tDH Data Out Hold Time 50 50 ns

tWR Write Cycle Time 5 5 ms

Endurance(1) 25°C, Page Mode, 3.3V 1,000,000 Write cycles

SCL

SDA IN

SDA OUT

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

7. Memory Organization

AT24MAC402/602, 2K Serial EEPROM: The 2-Kbit memory array is internally organized as 16 pages of 16

bytes of EEPROM each. Random word addressing requires a 8-bit data word address.

EUI Address and Serial Number: The 48-bit EUI address in the AT24MAC402 and the 64-bit EUI address in

the AT24MAC602 are located in the extended memory block. In addition, the serial number data is also located

in the extended memory block as shown below in Figure 7-1. These EUI-48 or EUI-64 addresses are stored in a

dedicated read-only EEPROM memory block located outside the standard 2K memory array as shown below.

This means the full standard 2-Kbit EEPROM array is available for use as opposed to solutions where only half

of the EEPROM memory array is available for application usage.

Figure 7-1. Memory Organization

The EUI-48 and EUI-64 address fields contain either six or eight bytes respectively. The first three bytes of the

EUI read-only address field are called the Organizationally Unique Identifier (OUI) and the IEEE Registration

Authority has assigned FCC23Dh as the Atmel, OUI.

Following the OUI, the remaining bytes are called the Extension Identifier and will be either three bytes or five

bytes depending on if it is an EUI-48 address (AT24MAC402) or EUI-64 address (AT24MAC602). Atmel

generates this unique 24-bit/40-bit data value along with the OUI to guarantee a globally unique EUI address

value and programs it at the factory before permanently locking the extended memory region.

Standard

2-Kbit

EEPROM

Extended

Memory

Second-half

Address Range (80h-FFh)

EUI-48/64 Value

EUI-48 Address Range (9Ah-9Fh)

EUI-64 Address Range (98h-9Fh)

128-bit Serial Number

Address Range (80h-8Fh)

Permanent or

Reversible Software

Write Protection Capable

Full Array Hardware

Write Protection Capable

Full Array Hardware

Write Protection

Capable

Read-only

Device Address

‘1010’

Device Address

‘1011’

First-half

Address Range (00h-7Fh)

 9
AT24MAC402/602 [DATASHEET]
Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015
7.1 EUI-48 Support 
The EUI-48 address is stored in the last six bytes of the AT24MAC402’s extended memory block as shown in 
Table 7-1. For information on the protocol to read the EUI-48 value, see Section 9., “Device Addressing” on 
page 13 and Section 12., “Read Operations” on page 19.
Table 7-1. 48-Bit EUI Address Memory Map Example
Using an EUI-48 Value in an EUI-64 Application: An EUI-64 compatible value can be generated from the 
EUI-48 value contained in the AT24MAC402 by concatenating the 24-bit OUI, an FFFEh data value, and the 
24-bit Extension Identifier. This is commonly referred to as an Encapsulated EUI-48 value. However, Atmel 
recommends using the AT24MAC602 which contains a true EUI-64 value so that post read processing is not 
required by the application.
7.2 EUI-64 Support 
For applications that utilize an EUI-64 standard, the EUI-64 address is stored in the last eight bytes of the 
AT24MAC602’s extended memory block. Similar to EUI-48, the EUI-64 standard consists of the same three 
byte OUI coupled with a five byte extension identifier (Table 7-2). Atmel generates this unique 40-bit data value 
coupled with the OUI to guarantee a globally unique 64-bit EUI value and requires no additional data 
manipulation like other solutions where the application must manually insert a two byte FFFEh value in between 
the OUI and Extension Identifier. For information on how to read the EUI read protocol, see See Section 9., 
“Device Addressing” on page 13 and “Read Operations” on page 19.
Table 7-2. 64-Bit EUI Address Memory Map Example
Note: 1. The data values FFFEh and FFFFh are prohibited beginning from the 40-bit Extension Identifier in Byte 1 and 
Byte 2. These values are reserved for denoting an encapsulated MAC-48 or EUI-48 value for use in an EUI-64 
environment.
7.3 Non-Atmel OUI Programming Option 
For customers with their own IEEE-assigned OUI or Company ID, Atmel offers the time saving option to 
manage and deliver custom AT24MAC402/602 devices with their EUI-48/64 values uniquely pre-programmed 
at delivery. Contact your local Atmel Sales Office for additional information.
48-Bit EUI
Description 24-Bit OUI 24-Bit Extension Identifier
Memory Address 9Ah 9Bh 9Ch 9Dh 9Eh 9Fh
EUI Data Value FCh C2h 3Dh Byte 1 Byte 2 Byte 3
64-Bit EUI
Description 24-Bit OUI 40-Bit Extension Identifier
Memory Address 98h 99h 9Ah 9Bh 9Ch 9Dh 9Eh 9Fh
EUI Data Value FCh C2h 3Dh Byte 1(1) Byte 2(1) Byte 3 Byte 4 Byte 5

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

8. Device Operation

Clock and Data Transitions: The SDA pin is normally pulled high with an external component such as a

pull-up resistor. Data on the SDA pin may change only during SCL low time periods. Data changes during SCL

high periods will indicate a Start or Stop condition as defined below.

Figure 8-1. Data Validity

Start Condition: A high-to-low transition of SDA with SCL high is a Start condition which must precede any

other command.

Stop Condition: A low-to-high transition of SDA with SCL high is a Stop condition. After a read sequence, the

stop command will place the EEPROM in a standby power mode.

Figure 8-2. Start and Stop Condition

SDA

SCL

Data Stable Data Stable

Data

Change

SDA

SCL

Start Stop

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Acknowledge: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words.

The EEPROM sends a zero to acknowledge that it has received each word. This happens during the ninth clock

cycle.

Figure 8-3. Output Acknowledge

Standby Mode: The AT24MAC402/602 features a low-power standby mode which is enabled upon

Power-up or

After the receipt of the Stop condition and the completion of any internal operations.

2-Wire Software Reset: After an interruption in protocol, power loss or system reset, any 2-wire part can be

reset by following these steps:

1. Create a Start condition (if possible).

2. Clock nine cycles.

3. Create another Start condition followed by Stop condition as shown below.

The device should be ready for the next communication after above steps have been completed. In the event

that the device is still non-responsive or remains active on the SDA bus, a power cycle must be used to reset

the device.

Figure 8-4. Software Reset

SCL

Data IN

Data OUT

Start Acknowledge

189

SCL 9

Start

Condition Start

Condition

Stop

Condition

8321

SDA

Dummy Clock Cycles

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Figure 8-5. Write Cycle Timing

SCL Serial Clock, SDA: Serial Data I/O

Note: 1. The write cycle time tWR is the time from a valid Stop condition of a write sequence to the end of

the internal clear/write cycle.

tWR

(1)

Stop

Condition

Start

Condition

Word

SCL

SDA

bit

ACK

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

9. Device Addressing

Standard EEPROM Access: The 2K EEPROM requires an 8-bit device address word following a start

condition to enable the chip for a read or write operation (see Figure 10-1 on page 14).

The device address word consists of a mandatory one-zero sequence for the first four most-significant bits

‘1010’(Ah) for normal read and write operations and ‘0110’ (6h) for writing to the Software Write Protect

The next three bits in the protocol sequence are the A2, A1, and A0 device address bits. These three bits must

match their corresponding hard-wired input pins A2, A1, and A0in order for the part to acknowledge.

The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if this bit is

high, and a write operation is initiated if this bit is low. Upon a compare of the device address, the EEPROM will

output a zero. If a compare is not made, the device will return to a standby state. The device will not

acknowledge if the Write Protect Register has been programmed and the control code is ‘0110’(6h).

Serial Number Access: The AT24MAC402/602 incorporates an extended memory block containing a

factory-programmed 128-bit serial number. Access to this memory location is obtained by beginning the device

address word with a ‘1011’(Bh) sequence. The behavior of the next three bits (A2, A1, and A0) remain the

same as during a standard memory addressing sequence.

The eighth bit of the device address needs to be set to a one to read the serial number. A zero in this bit

position, other than during a dummy write sequence to set the address pointer, will result in a unknown condition

and behavior. Writing or altering the 128-bit serial number is not possible as it is permanently write protected.

Further specific protocol is needed to address the serial number feature of the part. For more details on

accessing this special feature, See Section 12., “Read Operations” on page 19.

EUI Address Access: The AT24MAC402/602 utilizes an extended memory block containing a

factory-programmed read-only EUI-48 or EUI-64 address respectively. Access to this memory block is obtained

by beginning the device address word with a ‘1011’ (Bh) sequence. The behavior of the next three bits (A2,

A1, and A0) remain the same as during a standard memory addressing sequence.

The eighth bit of the device address needs to be set to a one to read the EUI address. A zero in this bit position,

other than during a dummy write sequence to set the address pointer, will result in a unknown condition and

behavior. Attempting to write or alter the EUI address is not possible as it is permanently write protected. Further

specific protocol is needed to address this feature of the part. For more details on accessing this special feature,

see Section 12., “Read Operations”.

Table 9-1. Device Address

Access Area Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

EEPROM 1 0 1 0 A2A1A0R/W

EUI or Serial Number Read 1 0 1 1 A2A1A01

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

10. Write Operations

Byte Write: A Byte Write operation requires an 8-bit data word address following the device address word and

acknowledgment. Upon receipt of this address, the EEPROM will again acknowledge or respond with a zero

and then clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a

zero and the addressing device, such as a microcontroller, must terminate the write sequence with a Stop

condition. At this time, the EEPROM enters an internally-timed write cycle, tWR, to the nonvolatile memory. All

inputs are disabled during this write cycle and the EEPROM will not respond until the write is complete. The

device will acknowledge a write command, but not write the data if the software or hardware write protection has

been enabled. The write cycle time must be observed even when the write protection is enabled.

Figure 10-1. Byte Write

Page Write: The AT24MAC402/602 is capable of a 16-byte Page Write. A Page Write is initiated by the same

method as a Byte Write, but the microcontroller does not send a Stop condition after the first data word is

clocked in. Instead, after the EEPROM acknowledges receipt of the first data word, the microcontroller can

transmit up to fifteen more data words. The EEPROM will respond with a zero after each data word received.

The microcontroller must terminate the page write sequence with a Stop condition.

The lower four data word address bits are internally incremented following the receipt of each data word. The

higher data word address bits are not incremented, retaining the memory page row location. When the internally

generated word address reaches the page boundary, the next byte is placed at the beginning of the same page.

If more than sixteen data words are transmitted to the EEPROM, the data word address will roll-over and

previous data will be overwritten. The address roll-over during write is from the last byte of the current page to

the first byte of the same page. The device will acknowledge a write command, but will not write the data if the

software or hardware write protection has been enabled. The write cycle time must be observed even when the

write protection is enabled.

Figure 10-2. Page Write

Acknowledge Polling: Once the internally-timed write cycle has started and the EEPROM inputs are disabled,

acknowledge polling can be initiated. This involves sending a Start condition followed by the device address

word. The read/write bit is representative of the operation desired. Only if the internal write cycle has completed

will the EEPROM respond with a zero allowing the read or write sequence to continue.

Device

Address

Word

Address Data

SDA LINE

Device

Address

SDA LINE

Word

Address Data (n) Data (n + 1) Data (n + x)

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

11. Write Protection

Once enabled, the Software Write Protection write protects only the first-half of the array (00h - 7Fh) while the

hardware write protection, via the WP pin, is used to protect the entire array (see Table 11-2 on page 16).

Permanent Software Write Protection (PSWP): The Permanent Software Write Protection is enabled by

sending a command to the device, similar to a normal write command, which programs the Permanent Write

Protect Register. This must be done with the WP pin low. The Write Protect Register is programmed by sending

a write command with the device address of ‘0110’(6h) instead of ‘1010’ (Ah) with the address and data

bit(s) being don’t cares. The write cycle time must be observed. Once the permanent software write protection

has been enabled, the device will no longer acknowledge the ‘0110’ (6h) control byte and cannot be reversed

even if the device is powered down. The Permanent Software Write Protection can only be invoked on a SOT23

packaged device with the A2, A1, and A0 bits set to zero.

Figure 11-1. Setting Permanent Write Protect Register (PSWP)

Reversible Software Write Protection (RSWP): The Reversible Software Write Protection is enabled by

sending a command to the device, similar to a normal write command, which programs the Reversible Write

Protect Register. This must be done with the WP pin low. The Reversible Write Protect Register is programmed

by sending a write command ‘01100010’(62h) with pins A2 and A1 tied to ground or not connected and the A0

pin connected to VHV (see Figure 11-2 and Table 11-1 on page 16). The Reversible Write Protection Register or

Write Protection can be reversed by sending a command ‘01100110’(66h) with the A2 pin tied to ground or no

connect, the A1 pin tied to VCC and the A0 pin tied to VHV (see Figure 11-3 on page 16 and Table 11-1 on page

16). Due to the unavailability of the A2, A1, and A0 pins, the Reversible Software Write Protection function is not

available on the SOT23 package.

Figure 11-2. Setting Reversible Write Protect Register (RSWP)

SDA LINE

Word Address DataControl Byte

0 1 1 0 A2 A1 A0 0

= Don’t Care

0110 0100

SDA LINE

Word Address DataControl Byte

= Don’t Care

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Figure 11-3. Clearing Reversible Write Protect Register (RSWP)

Table 11-1. VHV

Note: VHV – VCC > 4.8V

Hardware Write Protection: The WP pin can be connected to VCC, GND, or left floating. Connecting the WP

pin to VCC will write protect the entire array regardless of whether or not the Software Write Protection has been

enabled or invoked (see Table 11-3 on page 17 and Table 11-4 on page 18). The Software Write Protection

floating, the write protection mode is determined by the status of the Software Write Protect Register.

Table 11-2. Write Protection

Min Max Units

VHV 7 10 V

Pin Preamble R/W

Command A2A1A0Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Set PSWP A2A1A00 1 1 0 A2A1A00

Set RSWP 0 0 VHV 01100010

Clear RSWP 0 VCC VHV 01100110

0110 0101

SDA LINE

Word Address DataControl Byte

= Don’t Care

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Table 11-3. WP Connected to GND or Floating

WP Connected to GND or Floating

Command

R/W

Bit

Permanent

Write Protect

PSWP

Reversible

Write Protect

RSWP

Response

from

Device Action from Device

1010 R X X ACK Read Array.

1010 W Programmed X ACK Can write to second-half (80h - FFh) only.

1010 W X Programmed ACK Can write to second-half (80h - FFh) only.

1010 W Not Programmed Not Programmed ACK Can write to full array.

Read PSWP R Programmed X No ACK STOP – Indicates Permanent Write Protect

Read PSWP R Not Programmed X ACK Data read out is undefined. Indicates PSWP

Set PSWP W Programmed X No ACK STOP – Indicates Permanent Write Protect

Set PSWP W Not Programmed X ACK Program Permanent Write Protect Register

(irreversible).

Read RSWP R X Programmed No ACK STOP – Indicates Reversible Write Protect

Read RSWP R X Not Programmed ACK Data read out is undefined. Indicates RSWP

Set RSWP W X Programmed No ACK STOP – Indicates Reversible Write Protect

Set RSWP W X Not Programmed ACK Program Reversible Write Protect Register

(reversible).

Clear RSWP W Programmed X No ACK STOP – Indicates Permanent Write Protect

Clear RSWP W Not Programmed X ACK Clear (unprogram) Reversible Write Protect

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Table 11-4. WP Connected to VCC

WP Connected to VCC

Command

R/W

Bit

Permanent

Write Protect

PSWP

Reversible

Write Protect

RSWP

Response

from

Device Action from Device

1010 R X X ACK Read array.

1010 W X X ACK Device is write protected.

Read PSWP R Programmed X No ACK STOP – Indicates pErmanent Write Protect

Read PSWP R Not Programmed X ACK Data read out is undefined. Indicates PSWP

Set PSWP W Programmed X No ACK STOP – Indicates Permanent Write Protect

Set PSWP W Not Programmed X ACK Cannot program write protect registers.

Read RSWP R X Programmed No ACK STOP – Indicates Reversible Write Protect

Read RSWP R X Not Programmed ACK Data read out is undefined. Indicates RSWP

Set RSWP W X Programmed No ACK STOP – Indicates Reversible Write Protect

Set RSWP W X Not Programmed ACK Cannot program write protect registers.

Clear RSWP W Programmed X No ACK STOP – Indicates Permanent Write Protect

Clear RSWP W Not Programmed X ACK Cannot write to Write Protect Registers.

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

12. Read Operations

Read operations are initiated the same way as write operations with the exception that the read/write select bit

in the device address word is set to one. There are three types of read operations:

Current Address Read

Random Address Read

Sequential Read

Current Address Read: The internal data word address counter maintains the last address accessed during

the last read or write operation, incremented by one. This address stays valid between operations as long as

VCC to the chip is maintained. The address roll-over during read is from the last byte of the last memory page to

the first byte of the first page.

Once the device address with the read/write select bit set to one is clocked in and acknowledged by the

EEPROM, the current address data word is serially clocked out. To end the command, the microcontroller does

not respond with a zero but does generate a Stop condition in the subsequent clock cycle.

Figure 12-1. Current Address Read

Random Read: A Random Read requires a dummy byte write sequence to load in the data word address. Once

the device address word and data word address are clocked in and acknowledged by the EEPROM, the

microcontroller must generate another Start condition. The microcontroller now initiates a current address read

by sending a device address with the read/write select bit high. The EEPROM acknowledges the device

address and serially clocks out the data word. To end the random read sequence, the microcontroller does not

respond with a zero but does generate a Stop condition in the subsequent clock cycle.

Figure 12-2. Random Read

Device

Address Data

SDA LINE

Device

Address

Word

Address (n)

Device

Address Data (n)

Dummy Write

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Sequential Read: Sequential reads are initiated by either a current address read or a random address read.

After the microcontroller receives a data word, it responds with an acknowledge. As long as the Serial EEPROM

receives an acknowledge, it will continue to increment the data word address and serially clock out sequential

data words. When the memory address limit is reached, the data word address will “roll over” and the sequential

read will continue. The sequential read operation is terminated when the microcontroller does not respond with

a zero but does generate a following Stop condition in the subsequent clock cycle.

Figure 12-3. Sequential Read

Serial Number Read: Reading the serial number is similar to the sequential read sequence but requires use of

a different device address value as shown in Figure 12-4, followed by a dummy write, and the use of a specific

word address.

Note: The entire 128-bit value must be read from the starting address of the serial number block to guarantee

a unique number.

Since the address pointer of the device is shared between the regular EEPROM array and the serial number

block, a dummy write sequence, as part of a Random Read or Sequential Read protocol, should be performed

to ensure the address pointer is set to zero. A Current Address Read of the serial number block is supported but

if the previous operation was to the EEPROM array, the address pointer will retain the last location accessed,

incremented by one. Reading the serial number from a location other than the first address of the block will not

result in a unique serial number.

Additionally, the most-significant four bits of the word address must be ‘1000’(8h). Thus, if the application

desires to read the pre-programmed serial number, then the corresponding word address input would be 80h. If

a word address other than 80h is used, then the device will output undefined data.

Figure 12-4. Serial Number Read

SDA LINE

Device

Address Data (n + x) Data (n + 2) Data (n + 1) Data (n)

SDA LINE

Device

Address

Word

Address (n)

Device

Address

1 0 1 1 1 0 0 0 0 0 0 0 1 0 1 1

Dummy Write

Serial Number

Data Byte 0h

Serial Number

Data Byte 1h

Serial Number

Data Byte 2h

Serial Number

Data Byte 3h

Serial Number

Data Byte Fh

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

EUI Address Read: Reading the EUI address is very similar to the Serial Number read sequence with the

exceptions of the starting word address and the amount of data bytes clocked out (see Figure 12-5 on page 21).

The EUI read sequence requires use of the device address values as shown in Table 10-1 on page 14, followed

by a dummy write, and the use of a specific word address from Figure 7-1 on page 9 for EUI-48 standard or

Figure 7-2 on page 9 for EUI-64 standard.

Note: The entire six byte (EUI-48) or eight byte (EUI-64) values must be read from the respective starting

address of either 9Ah (for EUI-48) or 98h (for EUI-64) to guarantee a unique EUI data value.

Since the address pointer of the device is shared between the regular EEPROM array, the serial number block,

and the EUI block, a dummy write sequence should be performed to ensure the address pointer is set to the

correct starting EUI-48 or EUI-64 address. Random reads of the EUI block are supported, but if the previous

operation was to the EEPROM array or to the serial number block, the address pointer will retain the last

location accessed, incremented by one. Reading the EUI data from a location other than the correct starting EUI

address of the block will not result in a unique EUI data value.

Additionally, the most-significant four bits of the word address must be ‘1001’(9h). Therefore, if the application

desires to read the pre-programmed EUI value, then the corresponding word address input would be 9Ah in the

AT24MAC402 and 98h for the AT24MAC602. If a word address other than 9Ah or 98h respectively is used, the

device will output undefined data.

Once the EUI block of six or eight bytes of data have been clocked out of the device, the EUI read operation will

end when the microcontroller does not respond with a zero or acknowledge, but then creates a Stop condition. It

is important to note that the data word address will not roll-over back to the beginning of the respective EUI

starting address. If the read operation continues past the last EUI data value, the data word address will

roll-over back to the beginning of the extended memory block where the 128-bit serial number will begin to read

out. Therefore, every EUI read sequence attempt requires a valid starting address in the dummy write sequence

as shown in Figure 12-5.

Figure 12-5. EUI Address Read

SDA LINE

Device

Address

Word

Address (n)

Device

Address

1 0 0 1 * * * * 1 0 1 1 1 0 1 1

Dummy Write

EUI Address

Data Byte (n)

EUI Address

Data Byte (n + 1)

EUI Address

Data Byte (n + 2)

EUI Address

Data Byte (n + 3)

EUI Address

Data Byte (n + x)

* = 1010 (Ah) for 48-Bit EUI and 1000 (8h) for 64-Bit EUI.

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

Checking the Permanent Write Protect Register (PSWP) Status: Determining the status of the Permanent

Write Protect Register can be accomplished by sending a similar command to the device as was used when

programming the register, except the R/W bit must be set to one. If the device responds with an acknowledge,

the Permanent Write Protect Register has not been programmed; otherwise, it has been programmed and the

first-half of the array is permanently write protected.

Checking the Reversible Write Protect Register (RSWP) Status: Determining the status of the Reversible

Write Protect Register can be accomplished by sending a similar command to the device as was used when

programming the register, except the R/W bit must be set to one. If the device returns an acknowledge, the

Reversible Write Protect Register has not been programmed; otherwise, it has been programmed and the

first-half of the array is write protected, but remains reversible.

Table 12-1. PSWP and RSWP Status

Pin Preamble R/W

Command A2A1A0Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Read PSWP A2A1A00 1 1 0 A2A1A01

Read RSWP 0 0 A00 1 1 0 0 0 1 1

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

13. Ordering Information

13.1 Ordering Code Detail

Atmel Designator

Product Family

EUI Option

4 = EUI-48 Standard

6 = EUI-64 Standard

Package Option

SS = JEDEC SOIC

X = TSSOP

MA = UDFN

ST = SOT23

WWU = Wafer Unsawn

Operating Voltage

M = 1.7V to 5.5V

Package Device Grade or

Wafer/Die Thickness

H = Green, NiPdAu Lead Finish,

Industrial Temperature Range,

(-40°C to +85°C)

U = Green, Matte Sn Lead Finish,

Industrial Temperature Range,

(-40°C to +85°C)

11 = 11 mil Wafer Thickness

Shipping Carrier Option

Device Density

02 = 2-Kbit Density

24MAC = I2C-compatible Serial EEPROM

with EUI Address Feature

with 128-bit Serial Number Feature

B = Bulk (Tubes)

T = Tape and Reel, Standard Quantity Option

E = Tape and Reel, Expanded Quantity Option

AT24MAC402-SSHM-B

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

13.2 AT24MAC402/602 Ordering Codes

Note: 1. For wafer sales, please contact Atmel Sales.

Programming of IEEE assigned customer OUIs (non-Atmel OUIs) in conjunction with specific blocks of

EUI-48 (AT24MAC402) or EUI-64 (AT24MAC602) values is available. Contact Atmel for more details.

Additional package types that are not listed may be available. Contact Atmel for more details.

Atmel Ordering Codes Finish Package

Delivery Information Operation

Range

Form Quantity

AT24MAC402-SSHM-B

NiPdAu

(Lead-free/Halogen-free)

8S1

Bulk (Tubes) 100 per Tube

Industrial

Temperature

(-40°C to 85°C)

AT24MAC402-SSHM-T Tape and Reel 4,000 per Reel

AT24MAC402-XHM-B

Bulk (Tubes) 100 per Tube

AT24MAC402-XHM-T Tape and Reel 5,000 per Reel

AT24MAC402-MAHM-T

8MA2

Tape and Reel 5,000 per Reel

AT24MAC402-MAHM-E Tape and Reel 15,000 per Reel

AT24MAC402-STUM-T Matte Tin

(Lead-free/Halogen-free) 5TS1 Tape and Reel 5,000 per Reel

AT24MAC402-WWU11M(1) N/A Wafer Sale Note 1

AT24MAC602-SSHM-B

NiPdAu

(Lead-free/Halogen-free)

8S1

Bulk (Tubes) 100 per Tube

Industrial

Temperature

(-40°C to 85°C)

AT24MAC602-SSHM-T Tape and Reel 4,000 per Reel

AT24MAC602-XHM-B

Bulk (Tubes) 100 per Tube

AT24MAC602-XHM-T Tape and Reel 5,000 per Reel

AT24MAC602-MAHM-T

8MA2

Tape and Reel 5,000 per Reel

AT24MAC602-MAHM-E Tape and Reel 15,000 per Reel

AT24MAC602-STUM-T Matte Tin

(Lead-free/Halogen-free) 5TS1 Tape and Reel 5,000 per Reel

AT24MAC602-WWU11M(1) N/A Wafer Sale Note 1

Package Type

8S1 8-lead, 0.150" wide, Plastic Gull Wing Small Outline (JEDEC SOIC)

8X 8-lead, 0.170" wide, Thin Shrink Small Outline Package (TSSOP)

8MA2 8-pad, 2.00mm x 3.00mm body, 0.50mm pitch, Ultra Thin Dual No Lead (UDFN)

5TS1 5-lead, 2.90mm x 1.60mm body, Plastic Thin Shrink Small Outline (SOT23)

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

14. Part Markings

DRAWING NO. REV.

TITLE

Catalog Number Truncation

AT24MAC402 Truncation Code ##: P4

AT24MAC602 Truncation Code ##: P6

AAAAAAAA

## M @

ATMLHYWW

8-lead SOIC 8-lead TSSOP

AAAAAAA

## M @

ATHYWW

8-lead UDFN

HM@

YXX

2.0 x 3.0 mm Body

5-lead SOT-23

## MU

YMXX

Bottom Mark

Top Mark

Note 2: Package drawings are not to scale

Note 1: designates pin 1

Package Mark Contact:

DL-CSO-Assy_eng@atmel.com

24MAC402-602CSM C

4/3/12

24MAC402-602SM, AT24MAC402 and AT24MAC602

Package Marking Information

Date Codes Voltages

Y = Year M = Month WW = Work Week of Assembly M: 1.7V min

2: 2012 6: 2016 A: January 02: Week 2

3: 2013 7: 2017 B: February 04: Week 4

4: 2014 8: 2018 ... ...

5: 2015 9: 2019 L: December 52: Week 52

Country of Assembly Lot Number Grade/Lead Finish Material

@ = Country of Assembly AAA...A = Atmel Wafer Lot Number H: Industrial/NiPdAu

U: Industrial/Matte Tin

Trace Code Atmel Truncation

XX = Trace Code (Atmel Lot Numbers Correspond to Code) AT: Atmel

Example: AA, AB.... YZ, ZZ ATM: Atmel

ATML: Atmel

AT24MAC402 and AT24MAC602: Package Marking Information

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

15. Packaging Information

15.1 8S1 — 8-lead JEDEC SOIC

DRAWING NO. REV. TITLE GPC

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

A1 0.10 – 0.25

A 1.35 – 1.75

b 0.31 – 0.51

C 0.17 – 0.25

D 4.80 – 5.05

E1 3.81 – 3.99

E 5.79 – 6.20

e 1.27 BSC

L 0.40 – 1.27

0° – 8°

TOP VIEW

END VIEW

SIDE VIEW

Package Drawing Contact:

packagedrawings@atmel.com

8S1 G

6/22/11

Notes: This drawing is for general information only.

Refer to JEDEC Drawing MS-012, Variation AA

for proper dimensions, tolerances, datums, etc.

8S1, 8-lead (0.150” Wide Body), Plastic Gull Wing

Small Outline (JEDEC SOIC) SWB

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

15.2 8X — 8-lead TSSOP

DRAWING NO. REV. TITLE GPC

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

A - - 1.20

A1 0.05 - 0.15

A2 0.80 1.00 1.05

D 2.90 3.00 3.10 2, 5

E 6.40 BSC

E1 4.30 4.40 4.50 3, 5

b 0.19 0.25 0.30 4

e 0.65 BSC

L 0.45 0.60 0.75

L1 1.00 REF

C 0.09 - 0.20

Side View

End View

Top View

Pin 1 indicator

this corner

Notes: 1. This drawing is for general information only.

Refer to JEDEC Drawing MO-153, Variation AA, for proper

dimensions, tolerances, datums, etc.

2. Dimension D does not include mold Flash, protrusions or gate

burrs. Mold Flash, protrusions and gate burrs shall not exceed

0.15mm (0.006in) per side.

3. Dimension E1 does not include inter-lead Flash or protrusions.

Inter-lead Flash and protrusions shall not exceed 0.25mm

(0.010in) per side.

4. Dimension b does not include Dambar protrusion.

Allowable Dambar protrusion shall be 0.08mm total in excess

of the b dimension at maximum material condition. Dambar

cannot be located on the lower radius of the foot. Minimum

space between protrusion and adjacent lead is 0.07mm.

5. Dimension D and E1 to be determined at Datum Plane H.

Package Drawing Contact:

packagedrawings@atmel.com

8X E

2/27/14

8X, 8-lead 4.4mm Body, Plastic Thin

Shrink Small Outline Package (TSSOP) TNR

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

15.3 8MA2 — 8-pad UDFN

DRAWING NO. REV. TITLE GPC

8MA2 G

11/26/14

8MA2, 8-pad 2 x 3 x 0.6mm Body, Thermally

Enhanced Plastic Ultra Thin Dual Flat No-Lead

Package (UDFN)

YNZ

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

A 0.50 0.55 0.60

A1 0.0 0.02 0.05

A2 - - 0.55

D 1.90 2.00 2.10

D2 1.40 1.50 1.60

E 2.90 3.00 3.10

E2 1.20 1.30 1.40

b 0.18 0.25 0.30 3

C 1.52 REF

L 0.30 0.35 0.40

e 0.50 BSC

K 0.20 - -

TOP VIEW

SIDE VIEW

BOTTOM VIEW

Package Drawing Contact:

packagedrawings@atmel.com

Pin 1 ID

e (6x)

L (8x)

b (8x)

Pin#1 ID

Notes: 1. This drawing is for general information only. Refer to

Drawing MO-229, for proper dimensions, tolerances,

datums, etc.

2. The Pin #1 ID is a laser-marked feature on Top View.

3. Dimensions b applies to metallized terminal and is

measured between 0.15 mm and 0.30 mm from the

terminal tip. If the terminal has the optional radius on

the other end of the terminal, the dimension should

not be measured in that radius area.

4. The Pin #1 ID on the Bottom View is an orientation

feature on the thermal pad.

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

15.4 5TS1 — 5-lead SOT23

DRAWING NO. REV. TITLE GPC

Package Drawing Contact:

packagedrawings@atmel.com

5TS1 D

5/31/12

5TS1, 5-lead 1.60mm Body, Plastic Thin

Shrink Small Outline Package (Shrink SOT) TSZ

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

A - - 1.00

A1 0.00 - 0.10

A2 0.70 0.90 1.00

c 0.08 - 0.20 3

D 2.90 BSC 1,2

E 2.80 BSC 1,2

E1 1.60 BSC 1,2

L1 0.60 REF

e 0.95 BSC

e1 1.90 BSC

b 0.30 - 0.50 3,4

1. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash,

protrusions or gate burrs shall not exceed 0.15 mm per end. Dimension E1 does

not include interlead flash or protrusion. Interlead flash or protrusion shall not

exceed 0.15 mm per side.

2. The package top may be smaller than the package bottom. Dimensions D and E1

are determined at the outermost extremes of the plastic body exclusive of mold

flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch

between the top and bottom of the plastic body.

3. These dimensions apply to the flat section of the lead between 0.08 mm and 0.15

mm from the lead tip.

4. Dimension "b" does not include dambar protrusion. Allowable dambar protrusion

shall be 0.08 mm total in excess of the "b" dimension at maximum material

condition. The dambar cannot be located on the lower radius of the foot. Minimum

space between protrusion and an adjacent lead shall not be less than 0.07 mm.

This drawing is for general information only. Refer to JEDEC

Drawing MO-193, Variation AB for additional information.

END VIEW

PLANE

SEATING

SIDE VIEW

TOP VIEW

AT24MAC402/602 [DATASHEET]

Atmel-8807E-SEEPROM-AT24MAC402-602-Datasheet_012015

16. Revision History

Doc. Rev. Date Description

8808E 01/2015

Add the UDFN Expanded Quantity Option and the ordering information section and

reorganize sections.

Update the 8MA2 package outline drawing.

8808D 08/2014

Add bulk SOIC and TSSOP ordering codes. Update ordering code table, 8X and 8MA2

package drawings, and the disclaimer page.

Correct pinouts from bottom to top view and reorganization figures. No changes to functional

specification.

8807C 07/2013 Update status from preliminary to release.

Update footers and disclaimer page.

8807B 09/2012 Update ordering information.

8807A 06/2012 Initial document release.

XXX

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