25AA02UID
2K SPI Bus Serial EEPROM with Unique 32-Bit Serial Number
Device Selection Table
Part Number
25AA02UID
VCC Range
Page Size
Temp. Ranges
Packages
Unique ID Length
1.8-5.5V
16 Bytes
I
SN, OT
32-Bit
Features:
Description:
• Preprogrammed 32-Bit Serial Number:
- Unique across all UID-family EEPROMs
- Scalable to 48-bit, 64-bit, 128-bit, 256-bit,
and other lengths
• 10 MHz max. Clock Frequency
• Low-Power CMOS Technology:
- Max. write current: 5 mA at 5.5V
- Read current: 5 mA at 5.5V, 10 MHz
- Standby current: 1 A at 2.5V
• 256 x 8-Bit Organization
• Write Page mode (up to 16 bytes)
• Sequential Read
• Self-Timed Erase and Write Cycles (5 ms max.)
• Block Write Protection:
- Protect none, 1/4, 1/2 or all of array
• Built-in Write Protection:
- Power-on/off data protection circuitry
- Write enable latch
- Write-protect pin
• High Reliability:
- Endurance: 1,000,000 erase/write cycles
- Data retention: >200 years
- ESD protection: >4000V
• Temperature Ranges Supported:
- Industrial (I):
-40C to +85C
The Microchip Technology Inc. 25AA02UID is a 2 Kbit
Serial Electrically Erasable Programmable Read-Only
Memory (EEPROM) with a preprogrammed, 32-bit
unique ID. The memory is accessed via a simple Serial
Peripheral Interface (SPI) compatible serial bus. The
bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the
device is controlled through a Chip Select (CS) input.
• RoHS Compliant
SOT-23
SOIC
(OT)
(SN)
1
6
VSS
2
5
CS
SI
3
4
SO
VDD
2013 Microchip Technology Inc.
The 25AA02UID is available in the standard 8-lead
SOIC and 6-lead SOT-23 packages.
Pin Function Table
Name
CS
SO
1
2
8
7
VCC
HOLD
WP
3
6
SCK
VSS
4
5
SI
Function
CS
Chip Select Input
SO
Serial Data Output
WP
Write-Protect
VSS
Ground
SI
Serial Data Input
SCK
Serial Clock Input
HOLD
VCC
Package Types (not to scale)
SCK
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused, transitions on its inputs will be ignored, with the exception of
Chip Select, allowing the host to service higher priority
interrupts.
Hold Input
Supply Voltage
DS20005205A-page 1
25AA02UID
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings(†)
VCC .............................................................................................................................................................................6.5V
All inputs and outputs w.r.t. VSS ......................................................................................................... -0.6V to VCC +1.0V
Storage temperature .................................................................................................................................-65°C to 150°C
Ambient temperature under bias .................................................................................................................-40°C to 85°C
ESD protection on all pins ..........................................................................................................................................4 kV
† NOTICE: Stresses above 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 those or any other conditions above those
indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for an
extended period of time may affect device reliability.
TABLE 1-1:
DC CHARACTERISTICS
DC CHARACTERISTICS
Param.
No.
D001
Sym.
Characteristic
Industrial (I):
TA = -40°C to +85°C
Min.
Max.
Units
VCC = 1.8V to 5.5V
Test Conditions
VIH1
High-level Input
voltage
0.7 VCC
VCC +1
V
Low-level Input
Voltage
-0.3
0.3 VCC
V
VCC2.7V (Note 1)
-0.3
0.2 VCC
V
VCC < 2.7V (Note 1)
Low-level Output
Voltage
—
0.4
V
IOL = 2.1 mA
—
0.2
V
IOL = 1.0 mA, VCC < 2.5V
VCC -0.5
—
V
IOH = -400 A
D002
VIL1
D003
VIL2
D004
VOL
D005
VOL
D006
VOH
High-level Output
Voltage
D007
ILI
Input Leakage
Current
—
±1
A
CS = VCC, VIN = VSS or VCC
D008
ILO
Output Leakage
Current
—
±1
A
CS = VCC, VOUT = VSS or VCC
D009
CINT
Internal Capacitance
(all inputs and
outputs)
—
7
pF
TA = 25°C, CLK = 1.0 MHz,
VCC = 5.0V (Note 1)
D010
ICC Read
—
5
mA
—
2.5
mA
VCC = 5.5V; FCLK = 10.0 MHz;
SO = Open
VCC = 2.5V; FCLK = 5.0 MHz;
SO = Open
—
—
5
3
mA
mA
VCC = 5.5V
VCC = 2.5V
—
1
A
CS = VCC = 2.5V, Inputs tied to VCC or
VSS, TA = +85°C
Operating Current
D011
ICC Write
D012
ICCS
Note:
Standby Current
This parameter is periodically sampled and not 100% tested.
DS20005205A-page 2
2013 Microchip Technology Inc.
25AA02UID
TABLE 1-2:
AC CHARACTERISTICS
AC CHARACTERISTICS
Param.
Sym.
No.
Characteristic
Industrial (I):
TA = -40°C to +85°C
VCC = 1.8V to 5.5V
Min.
Max.
Units
Test Conditions
—
—
—
10
5
3
MHz
MHz
MHz
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
1
FCLK
Clock Frequency
2
TCSS
CS Setup Time
50
100
150
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
3
TCSH
CS Hold Time
100
200
250
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
4
TCSD
CS Disable Time
50
—
ns
—
5
Tsu
Data Setup Time
10
20
30
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
6
THD
Data Hold Time
20
40
50
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
7
TR
CLK Rise Time
—
100
ns
(Note 1)
8
TF
CLK Fall Time
—
100
ns
(Note 1)
9
THI
Clock High Time
50
100
150
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
10
TLO
Clock Low Time
50
100
150
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
11
TCLD
Clock Delay Time
50
—
ns
—
12
TCLE
Clock Enable Time
50
—
ns
—
13
TV
Output Valid from Clock
Low
—
—
—
50
100
160
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
14
THO
Output Hold Time
0
—
ns
(Note 1)
15
TDIS
Output Disable Time
—
—
—
40
80
160
ns
ns
ns
4.5V VCC 5.5V (Note 1)
2.5V VCC 4.5V (Note 1)
1.8V VCC 2.5V (Note 1)
16
THS
HOLD Setup Time
20
40
80
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
Note 1: This parameter is periodically sampled and not 100% tested.
2: This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model which can be obtained from Microchip’s web site
at www.Microchip.com.
3: TWC begins on the rising edge of CS after a valid write sequence and ends when the internal write cycle
is complete.
2013 Microchip Technology Inc.
DS20005205A-page 3
25AA02UID
TABLE 1-2:
AC CHARACTERISTICS (CONTINUED)
AC CHARACTERISTICS
Param.
Sym.
No.
Industrial (I):
Characteristic
TA = -40°C to +85°C
Min.
Max.
Units
VCC = 1.8V to 5.5V
Test Conditions
17
THH
HOLD Hold Time
20
40
80
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
18
THZ
HOLD Low to Output
High-Z
30
60
160
—
—
—
ns
ns
ns
4.5V VCC 5.5V (Note 1)
2.5V VCC 4.5V (Note 1)
1.8V VCC 2.5V (Note 1)
19
THV
HOLD High to Output
Valid
30
60
160
—
—
—
ns
ns
ns
4.5V VCC 5.5V
2.5V VCC 4.5V
1.8V VCC 2.5V
20
TWC
Internal Write Cycle Time
(byte or page)
—
5
ms
(Note 3)
21
—
Endurance
1M
—
E/W 25°C, VCC = 5.5V (Note 2)
Cycles
Note 1: This parameter is periodically sampled and not 100% tested.
2: This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model which can be obtained from Microchip’s web site
at www.Microchip.com.
3: TWC begins on the rising edge of CS after a valid write sequence and ends when the internal write cycle
is complete.
TABLE 1-3:
AC TEST CONDITIONS
AC Waveform:
VLO = 0.2V
—
VHI = VCC - 0.2V
(Note 1)
VHI = 4.0V
(Note 2)
CL = 100 pF
—
Timing Measurement Reference Level
Input
0.5 VCC
Output
0.5 VCC
Note 1: For VCC 4.0V.
2: For VCC 4.0V.
DS20005205A-page 4
2013 Microchip Technology Inc.
25AA02UID
FIGURE 1-1:
HOLD TIMING
CS
17
16
17
16
SCK
18
SO
n+2
SI
n+2
n+1
n
19
High-Impedance
n
5
Don’t Care
n+1
n-1
n
n
n-1
HOLD
FIGURE 1-2:
SERIAL INPUT TIMING
4
CS
2
7
Mode 1,1
8
3
12
11
SCK Mode 0,0
5
SI
6
MSB in
LSB in
High-Impedance
SO
FIGURE 1-3:
SERIAL OUTPUT TIMING
CS
9
3
10
Mode 1,1
SCK
Mode 0,0
13
SO
14
MSB out
SI
2013 Microchip Technology Inc.
15
ISB out
Don’t Care
DS20005205A-page 5
25AA02UID
2.0
FUNCTIONAL DESCRIPTION
2.1
Principles of Operation
The 25AA02UID is a 256-byte Serial EEPROM
designed to interface directly with the Serial Peripheral
Interface (SPI) port of many of today’s popular
microcontroller families, including Microchip’s PIC®
microcontrollers. It may also interface with microcontrollers that do not have a built-in SPI port by using
discrete I/O lines programmed properly in software to
match the SPI protocol.
The 25AA02UID contains an 8-bit instruction register.
The device is accessed via the SI pin, with data being
clocked in on the rising edge of SCK. The CS pin must
be low and the HOLD pin must be high for the entire
operation.
Table 2-1 contains a list of the possible instruction
bytes and format for device operation. All instructions,
addresses, and data are transferred MSb first, LSb last.
Data (SI) is sampled on the first rising edge of SCK
after CS goes low. If the clock line is shared with other
peripheral devices on the SPI bus, the user can assert
the HOLD input and place the 25AA02UID in ‘HOLD’
mode. After releasing the HOLD pin, operation will
resume from the point when the HOLD was asserted.
2.2
Read Sequence
The device is selected by pulling CS low. The 8-bit
READ instruction is transmitted to the 25AA02UID
followed by an 8-bit address. See Figure 2-1 for more
details.
After the correct READ instruction and address are sent,
the data stored in the memory at the selected address
is shifted out on the SO pin. Data stored in the memory
at the next address can be read sequentially by
continuing to provide clock pulses to the slave. The
internal Address Pointer automatically increments to
the next higher address after each byte of data is
shifted out. When the highest address is reached
(FFh), the address counter rolls over to address 00h,
allowing the read cycle to be continued indefinitely. The
read operation is terminated by raising the CS pin
(Figure 2-1).
2.3
After setting the write enable latch, the user may
proceed by driving CS low, issuing a WRITE instruction,
followed by the remainder of the address, and then the
data to be written. Up to 16 bytes of data can be sent to
the device before a write cycle is necessary. The only
restriction is that all of the bytes must reside in the
same page. Additionally, a page address begins with
XXXX 0000 and ends with XXXX 1111. If the internal
address counter reaches XXXX 1111 and clock signals
continue to be applied to the chip, the address counter
will roll back to the first address of the page and overwrite any data that previously existed in those
locations.
Note:
Page write operations are limited to
writing bytes within a single physical page,
regardless of the number of bytes
actually being written. Physical page
boundaries start at addresses that are
integer multiples of the page buffer size
(or ‘page size’) and, end at addresses that
are integer multiples of page size – 1. If a
page Write command attempts to write
across a physical page boundary, the
result is that the data wraps around to the
beginning of the current page (overwriting
data previously stored there), instead of
being written to the next page as might be
expected. It is therefore necessary for the
application software to prevent page write
operations that would attempt to cross a
page boundary.
For the data to be actually written to the array, the CS
must be brought high after the Least Significant bit (D0)
of the nth data byte has been clocked in. If CS is driven
high at any other time, the write operation will not be
completed. Refer to Figure 2-2 and Figure 2-3 for more
detailed illustrations on the byte write sequence and
the page write sequence, respectively. While the write
is in progress, the STATUS register may be read to
check the status of the WIP, WEL, BP1 and BP0 bits
(Figure 2-6). Attempting to read a memory array
location will not be possible during a write cycle. Polling
the WIP bit in the STATUS register is recommended in
order to determine if a write cycle is in progress. When
the write cycle is completed, the write enable latch is
reset.
Write Sequence
Prior to any attempt to write data to the 25AA02UID, the
write enable latch must be set by issuing the WREN
instruction (Figure 2-4). This is done by setting CS low
and then clocking out the proper instruction into the
25AA02UID. After all eight bits of the instruction are
transmitted, CS must be driven high to set the write
enable latch. If the write operation is initiated immediately after the WREN instruction without CS driven high,
data will not be written to the array since the write
enable latch was not properly set.
DS20005205A-page 6
2013 Microchip Technology Inc.
25AA02UID
BLOCK DIAGRAM
STATUS
Register
HV Generator
Memory
Control
Logic
I/O Control
Logic
EEPROM
Array
X
Dec
Page Latches
SI
SO
Y Decoder
CS
SCK
Sense Amp.
R/W Control
HOLD
WP
VCC
VSS
TABLE 2-1:
INSTRUCTION SET
Instruction Name
Instruction Format
Description
READ
0000 x011
Read data from memory array beginning at selected address
WRITE
0000 x010
Write data to memory array beginning at selected address
WRDI
0000 x100
Reset the write enable latch (disable write operations)
WREN
0000 x110
Set the write enable latch (enable write operations)
RDSR
0000 x101
Read STATUS register
WRSR
0000 x001
Write STATUS register
x = don’t care
FIGURE 2-1:
READ SEQUENCE
CS
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCK
Instruction
SI
0
0
0
0
0
Address Byte
0
1
1 A7 A6 A5 A4 A3 A2 A1 A0
Data Out
High-Impedance
SO
2013 Microchip Technology Inc.
7
6
5
4
3
2
1
0
DS20005205A-page 7
25AA02UID
FIGURE 2-2:
BYTE WRITE SEQUENCE
CS
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCK
Instruction
SI
0
0
0
0
0
Address Byte
0
Data Byte
0 A7 A6 A5 A4 A3 A2 A1 A0
1
Twc
7
6
5
4
3
2
1
0
High-Impedance
SO
FIGURE 2-3:
PAGE WRITE SEQUENCE
CS
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCK
Address Byte
Instruction
SI
0
0
0
0
0
0 1
Data Byte 1
0 A7 A6 A5 A4 A3 A2 A1 A0 7
6
5
4
3
2
1
0
CS
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
SCK
Data Byte 2
SI
7
6
DS20005205A-page 8
5
4
3
2
Data Byte 3
1
0
7
6
5
4
3
2
Data Byte n (16 max)
1
0
7
6
5
4
3
2
1
0
2013 Microchip Technology Inc.
25AA02UID
2.4
Write Enable (WREN) and Write
Disable (WRDI)
The following is a list of conditions under which the
write enable latch will be reset:
•
•
•
•
•
The 25AA02UID contains a write enable latch. See
Table 2-4 for the Write-Protect Functionality Matrix.
This latch must be set before any write operation will be
completed internally. The WREN instruction will set the
latch, and the WRDI will reset the latch.
FIGURE 2-4:
Power-up
WRDI instruction successfully executed
WRSR instruction successfully executed
WRITE instruction successfully executed
WP pin is brought low
WRITE ENABLE SEQUENCE (WREN)
CS
0
1
2
3
4
5
6
7
SCK
0
SI
0
0
0
1
1
0
High-Impedance
SO
FIGURE 2-5:
0
WRITE DISABLE SEQUENCE (WRDI)
CS
0
1
2
3
4
5
6
7
SCK
SI
0
0
0
0
0
1
0
0
High-Impedance
SO
2013 Microchip Technology Inc.
DS20005205A-page 9
25AA02UID
2.5
Read Status Register Instruction
(RDSR)
The Write Enable Latch (WEL) bit indicates the status
of the write enable latch and is read-only. When set to
a ‘1’, the latch allows writes to the array, when set to a
‘0’, the latch prohibits writes to the array. The state of
this bit can always be updated via the WREN or WRDI
commands regardless of the state of write protection
on the STATUS register. These commands are shown
in Figure 2-4 and Figure 2-5.
The Read Status Register instruction (RDSR) provides
access to the STATUS register. See Figure 2-6 for the
RDSR timing sequence. The STATUS register may be
read at any time, even during a write cycle. The
STATUS register is formatted as follows:
TABLE 2-2:
The Block Protection (BP0 and BP1) bits indicate
which blocks are currently write-protected. These bits
are set by the user issuing the WRSR instruction, which
is shown in Figure 2-7. These bits are nonvolatile and
are described in more detail in Table 2-3.
STATUS REGISTER
7
6 5 4
3
2
1
–
– – – W/R W/R
R
X
X X X BP1 BP0 WEL
W/R = writable/readable. R = read-only.
0
R
WIP
The Write-In-Process (WIP) bit indicates whether the
25AA02UID is busy with a write operation. When set to
a ‘1’, a write is in progress, when set to a ‘0’, no write
is in progress. This bit is read-only.
FIGURE 2-6:
READ STATUS REGISTER TIMING SEQUENCE (RDSR)
CS
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
0
SCK
Instruction
SI
0
0
0
0
0
High-Impedance
SO
DS20005205A-page 10
1
0
1
Data from STATUS register
7
6
5
4
3
2
2013 Microchip Technology Inc.
25AA02UID
2.6
Write Status Register Instruction
(WRSR)
TABLE 2-3:
The Write Status Register instruction (WRSR) allows
the user to write to the nonvolatile bits in the STATUS
register, as shown in Table 2-2. See Figure 2-7 for the
WRSR timing sequence. Four levels of protection for
the array are selectable by writing to the appropriate
bits in the STATUS register. The user has the ability to
write-protect none, one, two, or all four of the
segments of the array as shown in Table 2-3.
FIGURE 2-7:
ARRAY PROTECTION
BP1
BP0
Array Addresses
Write-Protected
0
0
none
0
1
upper 1/4
(C0h-FFh)
1
0
upper 1/2
(80h-FFh)
1
1
all
(00h-FFh)
WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)
CS
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
0
SCK
Instruction
SI
0
0
0
0
Data to STATUS register
0
0
0
1
7
6
5
4
3
2
High-Impedance
SO
2013 Microchip Technology Inc.
DS20005205A-page 11
25AA02UID
2.7
Data Protection
2.8
The following protection has been implemented to
prevent inadvertent writes to the array:
• The write enable latch is reset on power-up
• A write enable instruction must be issued to set
the write enable latch
• After a byte write, page write or STATUS register
write, the write enable latch is reset
• CS must be set high after the proper number of
clock cycles to start an internal write cycle
• Access to the array during an internal write cycle
is ignored and programming is continued
TABLE 2-4:
Power-On State
The 25AA02UID powers on in the following state:
• The device is in low-power Standby mode
(CS = 1)
• The write enable latch is reset
• SO is in high-impedance state
• A high-to-low-level transition on CS is required to
enter active state
WRITE-PROTECT FUNCTIONALITY MATRIX
WP
(pin 3)
WEL
(SR bit 1)
Protected Blocks
Unprotected Blocks
STATUS Register
0 (low)
x
Protected
Protected
Protected
1 (high)
0
Protected
Protected
Protected
1 (high)
1
Protected
Writable
Writable
x = don’t care
DS20005205A-page 12
2013 Microchip Technology Inc.
25AA02UID
3.0
PREPROGRAMMED UNIQUE
32-BIT SERIAL NUMBER
3.1
In addition to the serial number, a manufacturer code is
stored at location 0xFA and a device identifier is stored
at 0xFB. The manufacturer code is fixed as 0x29. For
the 25AA02UID, the device identifier is 0x51. The ‘5’
indicates the SPI family and the ‘1’ indicates a 2 Kbit
memory density.
The 25AA02UID is programmed at the factory with a
unique 32-bit serial number stored in the upper 1/4 of
the array and write-protected through the STATUS
register. The remaining 1,536 bits are available for
application use.
Note:
The 32-bit serial number is unique across
all Microchip UID-family serial EEPROM
devices.
FIGURE 3-1:
3.2
00h
7
X
—
Standard
EEPROM
FFh
Manufacturer
Code
Device
Code
Data
29h
51h
Type
3.3
5
X
—
4
X
—
3
BP1
0
2
BP0
1
1
WEL
—
0
WIP
—
SERIAL NUMBER PHYSICAL MEMORY MAP EXAMPLE
Description
Array
Address
6
X
—
This protects the upper 1/4 of the array (0xC0 to 0xFF)
from write operations. This array block can be utilized
for writing by clearing the BP bits with a Write Status
Register (WRSR) instruction. Note that if this is performed, care must be taken to prevent overwriting the
serial number.
C0h
The 4-byte serial number is stored in array locations
0xFC through 0xFF, as shown in Figure 3-2.
FIGURE 3-2:
Factory-Programmed Write
Protection
In order to help guard against accidental corruption of
the serial number, the BP1 and BP0 bits of the STATUS
register are programmed at the factory to ‘0’ and ‘1’,
respectively, as shown in the following table:
MEMORY ORGANIZATION
Write-Protected
Serial Number Block
Manufacturer and Device Codes
32-bit Serial Number
12h
34h
Fixed
FAh
78h
FEh
FFh
Serialized
FBh
Extending the 32-bit Serial
Number
For applications that require serial numbers larger than
32 bits, additional data bytes can be used to pad the
provided serial number to meet the required length.
Any data byte values can be used for padding as the
32-bit serial number ensures the extended serial
number remains unique.
The padding can be performed in two ways. The first
method is to pad the data in software by combining the
32-bit serial number from the 25AA02UID with fixed
data. The second method is to extend the number of
bytes read from the 25AA02UID to meet the required
length. Table 3-1 shows example address ranges and
their corresponding serial number lengths.
2013 Microchip Technology Inc.
56h
FCh
FDh
TABLE 3-1:
EXTENDED READ EXAMPLES
Start Address
End Address
Serial Number
Length
0xFC
0xFF
32 bits
0xFA
0xFF
48 bits
0xF8
0xFF
64 bits
0xF0
0xFF
128 bits
0xE0
0xFF
256 bits
DS20005205A-page 13
25AA02UID
4.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 4-1.
4.5
TABLE 4-1:
The SCK is used to synchronize the communication
between a master and the 25AA02UID. Instructions,
addresses or data present on the SI pin are latched on
the rising edge of the clock input, while data on the SO
pin is updated after the falling edge of the clock input.
PIN FUNCTION TABLE
Name
SOIC
SOT-23
Function
Chip Select Input
Serial Clock (SCK)
CS
1
5
SO
2
4
Serial Data Output
WP
3
—
Write-Protect Pin
4.6
VSS
4
2
Ground
SI
5
3
Serial Data Input
Serial Clock Input
The HOLD pin is used to suspend transmission to the
25AA02UID while in the middle of a serial sequence
without having to retransmit the entire sequence again.
It must be held high any time this function is not being
used. Once the device is selected and a serial
sequence is underway, the HOLD pin may be pulled
low to pause further serial communication without
resetting the serial sequence. The HOLD pin must be
brought low while SCK is low, otherwise the HOLD
function will not be invoked until the next SCK high-tolow transition. The 25AA02UID must remain selected
during this sequence. The SI, SCK and SO pins are in
a high-impedance state during the time the device is
paused and transitions on these pins will be ignored. To
resume serial communication, HOLD must be brought
high while the SCK pin is low, otherwise serial
communication will not resume. Lowering the HOLD
line at any time will tri-state the SO line.
SCK
6
1
HOLD
7
—
Hold Input
VCC
8
6
Supply Voltage
4.1
Chip Select (CS)
A low level on this pin selects the device. A high level
deselects the device and forces it into Standby mode.
However, a programming cycle which is already
initiated or in progress will be completed, regardless of
the CS input signal. If CS is brought high during a
program cycle, the device will go into Standby mode as
soon as the programming cycle is complete. When the
device is deselected, SO goes to the high-impedance
state, allowing multiple parts to share the same SPI
bus. A low-to-high transition on CS after a valid write
sequence initiates an internal write cycle. After powerup, a low level on CS is required prior to any sequence
being initiated.
4.2
Hold (HOLD)
Serial Output (SO)
The SO pin is used to transfer data out of the
25AA02UID. During a read cycle, data is shifted out on
this pin after the falling edge of the serial clock.
4.3
Write-Protect (WP)
The WP pin is a hardware write-protect input pin.
When it is low, all writes to the array or STATUS register are disabled, but any other operations function
normally. When WP is high, all functions, including
nonvolatile writes operate normally. At any time, when
WP is low, the write enable Reset latch will be reset
and programming will be inhibited. However, if a write
cycle is already in progress, WP going low will not
change or disable the write cycle. See Table 2-4 for
the Write-Protect Functionality Matrix.
4.4
Serial Input (SI)
The SI pin is used to transfer data into the device. It
receives instructions, addresses and data. Data is
latched on the rising edge of the serial clock.
DS20005205A-page 14
2013 Microchip Technology Inc.
25AA02UID
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
Example:
8-Lead SOIC
25A2UIDI
SN e3 1327
1L7
XXXXXXXT
XXXXYYWW
NNN
6-Lead SOT-23
Example:
XXXXY
WWNNN
AAAD3
271L7
1st Line Marking Code
Part Number
25AA02UID
Legend: XX...X
T
Y
YY
WW
NNN
e3
Note:
Note:
SOIC
SOT-23
I Temp.
I Temp.
25A2UIDT
AAADY
Part number or part number code
Temperature (I, E)
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code (2 characters for small packages)
Pb-free JEDEC designator for Matte Tin (Sn)
For very small packages with no room for the Pb-free JEDEC designator
e3 , the marking will only appear on the outer carton or reel label.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
*Standard OTP marking consists of Microchip part number, year code, week code, and traceability code.
2013 Microchip Technology Inc.
DS20005205A-page 15
25AA02UID
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS20005205A-page 16
2013 Microchip Technology Inc.
25AA02UID
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2013 Microchip Technology Inc.
DS20005205A-page 17
25AA02UID
!"#$%
&
!
"#$%&"'""
($)
%
*++&&&!
!+$
DS20005205A-page 18
2013 Microchip Technology Inc.
25AA02UID
'
(("()%
&
!
"#$%&"'""
($)
%
*++&&&!
!+$
b
4
N
E
E1
PIN 1 ID BY
LASER MARK
1
2
3
e
e1
D
A
A2
c
φ
L
A1
L1
>"
!"
?!"
@#!G
)("
??66
@
@
@A
E
H
(
;<
A#"%?%(
3
3;<
A=J
K
%%($$""
L
K
3
31
%
))
3
K
3
A=N%
6
K
1
%%($N%
63
31
K
3L
A=?
K
13
?
?
3
K
H
?3
1
K
L
O
K
1O
?%$""
L
K
H
?%N%
G
K
3
&
3 !"
"%63%
#%!
%)"
#"
"
%)"
#"
""
7%3!!"%
!"
%
683
;<* ;"!"
7=#"
&&
#
"
& <L;
2013 Microchip Technology Inc.
DS20005205A-page 19
25AA02UID
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS20005205A-page 20
2013 Microchip Technology Inc.
25AA02UID
APPENDIX A:
REVISION HISTORY
Revision A (05/2013)
Initial release.
2013 Microchip Technology Inc.
DS20005205A-page 21
25AA02UID
NOTES:
DS20005205A-page 22
2013 Microchip Technology Inc.
25AA02UID
THE MICROCHIP WEB SITE
CUSTOMER SUPPORT
Microchip provides online support via our WWW site at
www.microchip.com. This web site is used as a means
to make files and information easily available to
customers. Accessible by using your favorite Internet
browser, the web site contains the following
information:
Users of Microchip products can receive assistance
through several channels:
• Product Support – Data sheets and errata,
application notes and sample programs, design
resources, user’s guides and hardware support
documents, latest software releases and archived
software
• General Technical Support – Frequently Asked
Questions (FAQ), technical support requests,
online discussion groups, Microchip consultant
program member listing
• Business of Microchip – Product selector and
ordering guides, latest Microchip press releases,
listing of seminars and events, listings of
Microchip sales offices, distributors and factory
representatives
•
•
•
•
•
Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Technical Support
Development Systems Information Line
Customers
should
contact
their
distributor,
representative or field application engineer (FAE) for
support. Local sales offices are also available to help
customers. A listing of sales offices and locations is
included in the back of this document.
Technical support is available through the web site
at: http://support.microchip.com
CUSTOMER CHANGE NOTIFICATION
SERVICE
Microchip’s customer notification service helps keep
customers current on Microchip products. Subscribers
will receive e-mail notification whenever there are
changes, updates, revisions or errata related to a
specified product family or development tool of interest.
To register, access the Microchip web site at
www.microchip.com, click on Customer Change
Notification and follow the registration instructions.
2013 Microchip Technology Inc.
DS20005205A-page 23
25AA02UID
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation
can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.
Please list the following information, and use this outline to provide us with your comments about this document.
To:
Technical Publications Manager
RE:
Reader Response
Total Pages Sent ________
From: Name
Company
Address
City / State / ZIP / Country
Telephone: (_______) _________ - _________
FAX: (______) _________ - _________
Application (optional):
Would you like a reply?
Device: 25AA02UID
Y
N
Literature Number: DS20005205A
Questions:
1. What are the best features of this document?
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
DS20005205A-page 24
2013 Microchip Technology Inc.
25AA02UID
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
X
Device
Tape & Reel
–
X
Temperature
/XX
Package
Examples:
a)
b)
Device:
25AA02UID =
2k-Bit, 1.8V, 16-Byte Page, SPI Serial EEPROM
with 32-bit Serial Number
Tape & Reel:
Blank
T
=
=
Standard packaging
Tape & Reel
Temperature
Range:
I
=
-40C to+85C
Package:
SN
OT
=
=
Plastic SOIC (3.90 mm body), 8-lead
SOT-23, 6-lead (Tape and Reel only)
2013 Microchip Technology Inc.
c)
25AA02UID-I/SN = 2k-bit, 16-byte page, 1.8V
Serial EEPROM with 32-bit serial number,
Industrial temp., SOIC package
25AA02UIDT-I/SN = 2k-bit, 16-byte page, 1.8V
Serial EEPROM with 32-bit serial number,
Industrial temp., Tape & Reel, SOIC package
25AA02UIDT-I/OT = 2k-bit, 16-byte page, 1.8V
Serial EEPROM with 32-bit serial number,
Industrial temp., Tape & Reel, SOT-23 package
DS20005205A-page 25
25AA02UID
NOTES:
DS20005205A-page 26
2013 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash
and UNI/O are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MTP, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
Analog-for-the-Digital Age, Application Maestro, BodyCom,
chipKIT, chipKIT logo, CodeGuard, dsPICDEM,
dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O,
Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA
and Z-Scale are trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
GestIC and ULPP are registered trademarks of Microchip
Technology Germany II GmbH & Co. KG, a subsidiary of
Microchip Technology Inc., in other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2013, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 9781620772294
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
== ISO/TS 16949 ==
2013 Microchip Technology Inc.
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS20005205A-page 27
Worldwide Sales and Service
AMERICAS
ASIA/PACIFIC
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EUROPE
Corporate Office
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Technical Support:
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DS20005205A-page 28
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11/29/12
2013 Microchip Technology Inc.