ATMEL AT24C02A Two-wire automotive temperature serial eeprom Datasheet

Features
• Write Protect Pin for Hardware Data Protection
– Utilizes Different Array Protection Compared to the AT24C02A/04A
• Standard-voltage Operation
– 2.7 (VCC = 2.7V to 5.5V)
Internally Organized 256 x 8 (2K), 512 x 8 (4K)
Two-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
400 kHz Clock Rate
8-byte Page (2K), 16-byte Page (4K) Write Modes
Partial Page Writes Allowed
Self-timed Write Cycle (5 ms Max)
High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 100 Years
• Lead-Free/Halogen-Free Devices Available
• 8-lead JEDEC SOIC and 8-lead TSSOP Packages
•
•
•
•
•
•
•
•
•
Two-wire
Automotive
Temperature
Serial
EEPROM
Description
The AT24C02A/04A provides 2048/4096 bits of serial electrically erasable and programmable read-only memory (EEPROM) organized as 256/512 words of 8 bits each.
The device is optimized for use in many automotive applications where low-power and
low-voltage operation are essential. The AT24C02A/04A is available in space-saving
8-lead JEDEC SOIC and 8-lead TSSOP packages and is accessed via a two-wire
serial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) version.
Table 1. Pin Configurations
Pin Name
Function
A0–A2
Address Inputs
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
NC
No-connect
2K (256 x 8)
4K (512 x 8)
AT24C02A
AT24C04A
8-lead SOIC
A0
A1
A2
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
8-lead TSSOP
A0
A1
A2
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
5083C–SEEPR–1/07
1
Absolute Maximum Ratings*
*NOTICE:
Operating Temperature......................................−40°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........................................................ 5.0 mA
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.
Figure 1. Block Diagram
START
STOP
LOGIC
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 opencollector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1, and A0 pins are device
address inputs that must be hardwired for the AT24C02A. As many as eight 2K devices
may be addressed on a single bus system. (Device addressing is discussed in detail
under Device Addressing, page 7).
The AT24C04A uses the A2 and A1 inputs for hardwire addressing, and a total of four
4K devices may be addressed on a single bus system. The A0 pin is a no-connect.
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AT24C02A/04A
5083C–SEEPR–1/07
AT24C02A/04A
WRITE PROTECT (WP): The AT24C02A/04A have a WP pin that provides hardware
data protection. The WP pin allows normal read/write operations when connected to
ground (GND). When the WP pin is connected to VCC, the write protection feature is
enabled and operates as shown. (See Table 1.)
Table 1. Write Protect
Part of the Array Protected
WP Pin Status
At VCC
24C02A
24C04A
Upper Half (1K) Array
Upper Half (2K) Array
At GND
Memory Organization
Normal Read/Write Operations
AT24C02A, 2K SERIAL EEPROM: The 2K is internally organized with 32 pages of 8
bytes each. Random word addressing requires an 8-bit data word address.
AT24C04A, 4K SERIAL EEPROM: The 4K is internally organized with 32 pages of 16
bytes each. Random word addressing requires a 9-bit data word address.
Table 2. Pin Capacitance
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, Vcc= +2.7V
Symbol
Test Condition
CI/O
CIN
Note:
Max
Units
Conditions
Input/Output Capacitance (SDA)
8
pF
VI/O = 0V
Input Capacitance (A0, A1, A2, SCL)
6
pF
VIN = 0V
This parameter is characterized and is not 100% tested.
Table 3. DC Characteristics
Applicable over recommended operating range from: TA = −40°C to +125°C, VCC = +2.7V to +5.5V
(unless otherwise noted)
Symbol
Parameter
Test Condition
VCC3
Supply Voltage
ICC
Supply Current VCC = 5.0V
READ at 100 kHz
ICC
Supply Current VCC = 5.0V
ISB3
Min
Typ
Max
Units
5.5
V
0.4
1.0
mA
WRITE at 100 kHz
2.0
3.0
mA
Standby Current VCC = 2.7V
VIN = VCC or VSS
1.6
4.0
µA
ISB4
Standby Current VCC = 5.0V
VIN = VCC or VSS
8.0
18.0
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
VCC x 0.7
VCC + 0.5
V
2.7
(1)
VIH
Input High Level
VOL2
Output Low Level VCC = 3.0V
IOL = 2.1 mA
0.4
V
VOL1
Output Low Level VCC = 1.8V
IOL = 0.15 mA
0.2
V
Note:
1. VIL min and VIH max are reference only and are not tested.
3
5083C–SEEPR–1/07
Table 4. AC Characteristics
Applicable over recommended operating range from T = −40°C to +125°C, VCC = +2.7V to +5.5V, CL = 1 TTL Gate and 100
pF (unless otherwise noted)
AT24C02A/04A
Symbol
Parameter
Min
fSCL
Clock Frequency, SCL
tLOW
Clock Pulse Width Low
tHIGH
Clock Pulse Width High
Max
Units
400
kHz
1.2
µs
0.6
µs
(1)
tI
Noise Suppression Time
tAA
Clock Low to Data Out Valid
0.1
tBUF
Time the bus must be free before
a new transmission can start(2)
1.2
µs
tHD.STA
Start Hold Time
0.6
µs
tSU.STA
Start Set-up Time
0.6
µs
tHD.DAT
Data In Hold Time
0
µs
tSU.DAT
Data In Set-up Time
100
ns
tR
Inputs Rise Time(2)
(2)
50
ns
0.9
µs
300
ns
300
ns
tF
Inputs Fall Time
tSU.STO
Stop Set-up Time
0.6
µs
tDH
Data Out Hold Time
50
ns
Write Cycle Time
tWR
(2)
Endurance
Note:
5.0V, 25°C, Page Mode
5
1M
ms
Write Cycles
1. This parameter is characterized and is not 100% tested (TA = 25°C).
2. This parameter is characterized and is not 100% tested.
4
AT24C02A/04A
5083C–SEEPR–1/07
AT24C02A/04A
Device Operation
CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only during SCL low time periods (see
Figure 2). Data changes during SCL high periods will indicate a start or stop condition as
defined in Figure 2.
Figure 2. Data Validity
START CONDITION: A high-to-low transition of SDA with SCL high is a start condition
that must precede any other command (see Figure 3).
Figure 3. Start and Stop Definition
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 (see Figure 3).
ACKNOWLEDGE: All addresses and data words are serially transmitted to and from
the EEPROM in 8-bit words. The EEPROM sends a “0” to acknowledge that it has
received each word. This happens during the ninth clock cycle.
STANDBY MODE: The AT24C02A/04A features a low-power standby mode that is
enabled (a) upon power-up and (b) after the receipt of the STOP bit and the completion
of any internal operations.
5
5083C–SEEPR–1/07
MEMORY RESET: After an interruption in protocol, power loss or system reset, any
two-wire part can be reset by following these steps:
1. Clock up to 9 cycles.
2. Look for SDA high in each cycle while SCL is high.
3. Create a start condition as SDA is high.
Figure 4. Bus Timing
Figure 5. Write Cycle Timing
SCL
SDA
8th BIT
ACK
WORDn
(1)
twr
STOP
CONDITION
Note:
6
START
CONDITION
The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the interval clear/write cycle.
AT24C02A/04A
5083C–SEEPR–1/07
AT24C02A/04A
Figure 6. Output Acknowledge
Device Addressing
The 2K and 4K EEPROM devices all require an 8-bit device address word following a
start condition to enable the chip for a read or write operation, as shown in Figure 7.
Figure 7. Device Address
2K
1
0
1
0
A2 A1 A0 R/W
LSB
0
1
0
A2 A1 P0 R/W
MSB
4K
1
The device address word consists of a mandatory “1”, “0” sequence for the first four
most significant bits as shown. This is common to all the EEPROM devices.
The next three bits are the A2, A1, and A0 device address bits for the 2K EEPROM.
These three bits must compare to their corresponding hardwired input pins.
The 4K EEPROM only uses the A2 and A1 device address bits with the third bit being a
memory page address bit. The two device address bits must compare to their corresponding hardwired input pins. The A0 pin is no-connect.
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 “0”. If a compare is
not made, the chip will return to a standby state.
Write Operations
BYTE WRITE: A write operation requires an 8-bit data word address following the
device address word and acknowledgement. Upon receipt of this address, the EEPROM
will again respond with a “0” and then clock in the first 8-bit data word. Following receipt
7
5083C–SEEPR–1/07
of the 8-bit data word, the EEPROM will output a “0” 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, as shown in Figure 8.
Figure 8. Byte Write
S
T
A
R
T
DEVICE
ADDRESS
W
R
I
T
E
WORD ADDRESS
S
T
O
P
DATA
SDA LINE
M
S
B
L R A
S / C
BW K
M
S
B
L
S
B
A
C
K
A
C
K
PAGE WRITE: The 2K EEPROM is capable of an 8-byte page write, and the 4K
EEPROM device is capable of 16-byte page writes.
A page write is initiated the same 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 seven
(2K) or fifteen (4K) more data words. The EEPROM will respond with a “0” after each
data word received. The microcontroller must terminate the page write sequence with a
stop condition, as shown in Figure 9.
Figure 9. Page Write
S
T
A
R
T
DEVICE
ADDRESS
W
R
I
T
E WORD ADDRESS (n)
DATA (n)
DATA (n + 1)
S
T
O
P
DATA (n + x)
SDA LINE
M
S
B
L R A
S / C
BW K
A
C
K
A
C
K
A
C
K
A
C
K
The data word address lower three (2K) or four (4K) 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 word address, internally generated, reaches the page boundary, the following byte is placed at the
beginning of the same page. If more than eight (2K) or sixteen (4K) data words are
transmitted to the EEPROM, the data word address will “roll over” and previous data will
be overwritten.
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 “0” allowing the read or write sequence to continue.
8
AT24C02A/04A
5083C–SEEPR–1/07
AT24C02A/04A
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 “1”. There are three read
operations: current address read, random address read and 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 the chip power 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. The address “roll over” during write is from the last byte of the current page to the first byte of the same page.
Once the device address with the read/write select bit set to “1” is clocked in and
acknowledged by the EEPROM, the current address data word is serially clocked out.
The microcontroller does not respond with an input “0” but does generate a following
stop condition, as shown in Figure 10.
Figure 10. Current Address Read
S
T
A
R
T
DEVICE
ADDRESS
R
E
A
D
S
T
O
P
SDA LINE
L R A
S / C
BW K
M
S
B
N
O
DATA
A
C
K
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. The microcontroller does not respond
with a “0” but does generate a following stop condition, as shown in Figure 11.
Figure 11. Random Read
S
T
A
R
T
DEVICE
ADDRESS
W
R
I
T
E
S
T
A
R
T
WORD
ADDRESS n
R
E
A
D
DEVICE
ADDRESS
S
T
O
P
SDA LINE
M
S
B
L R A
S / C
BW K
M
S
B
L A
S C
B K
M
S
B
L
S
B
A
C
K
DATA n
N
O
A
C
K
DUMMY WRITE
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 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
9
5083C–SEEPR–1/07
microcontroller does not respond with a “0” but does generate a following stop condition,
as shown in Figure 12.
Figure 12. Sequential Read
10
AT24C02A/04A
5083C–SEEPR–1/07
AT24C02A/04A
AT24C02A Ordering Information
Ordering Code
Package
Operation Range
8S1
8A2
Lead-free/Halogen-free/
Automotive Temperature
(−40°C to 125°C)
AT24C02AN-10SQ-2.7
AT24C02A-10TQ-2.7
Package Type
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8A2
8-lead, 0.170" Wide, Thin Shrink Small Outline Package (TSSOP)
Options
−2.7
Low Voltage (2.7V to 5.5V)
11
5083C–SEEPR–1/07
AT24C04A Ordering Information
Ordering Code
Package
Operation Range
8A2
8S1
Lead-free/Halogen-free
Automotive Temperature
(−40°C to 125°C)
AT24C04A-10TQ-2.7
AT24C04AN-10SQ-2.7
Package Type
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8A2
8-lead, 0.170" Wide, Thin Shrink Small Outline Package (TSSOP)
Options
−2.7
12
Low Voltage (2.7V to 5.5V)
AT24C02A/04A
5083C–SEEPR–1/07
AT24C02A/04A
Packaging Information
8S1 – JEDEC SOIC
C
1
E
E1
L
N
∅
Top View
End View
e
B
COMMON DIMENSIONS
(Unit of Measure = mm)
A
SYMBOL
A1
D
Side View
MIN
NOM
MAX
A
1.35
–
1.75
A1
0.10
–
0.25
b
0.31
–
0.51
C
0.17
–
0.25
D
4.80
–
5.00
E1
3.81
–
3.99
E
5.79
–
6.20
e
NOTE
1.27 BSC
L
0.40
–
1.27
∅
0°
–
8°
Note: These drawings are for general information only. Refer to JEDEC Drawing MS-012, Variation AA for proper dimensions, tolerances, datums, etc.
10/7/03
R
1150 E. Cheyenne Mtn. Blvd.
Colorado Springs, CO 80906
TITLE
8S1, 8-lead (0.150" Wide Body), Plastic Gull Wing
Small Outline (JEDEC SOIC)
DRAWING NO.
8S1
REV.
B
13
5083C–SEEPR–1/07
8A2 – TSSOP
3
2 1
Pin 1 indicator
this corner
E1
E
L1
N
L
Top View
End View
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL
A
b
D
MIN
NOM
MAX
NOTE
2.90
3.00
3.10
2, 5
3, 5
E
e
A2
D
6.40 BSC
E1
4.30
4.40
4.50
A
–
–
1.20
A2
0.80
1.00
1.05
b
0.19
–
0.30
e
Side View
L
0.65 BSC
0.45
L1
Notes:
0.60
0.75
1.00 REF
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
0.15 mm (0.006 in) per side.
3. Dimension E1 does not include inter-lead Flash or protrusions. Inter-lead Flash and protrusions shall not exceed 0.25 mm
(0.010 in) per side.
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. Dambar cannot be located on the lower radius of the foot. Minimum space between
protrusion and adjacent lead is 0.07 mm.
5. Dimension D and E1 to be determined at Datum Plane H.
5/30/02
R
14
4
2325 Orchard Parkway
San Jose, CA 95131
TITLE
8A2, 8-lead, 4.4 mm Body, Plastic
Thin Shrink Small Outline Package (TSSOP)
DRAWING NO.
8A2
REV.
B
AT24C02A/04A
5083C–SEEPR–1/07
AT24C02A/04A
Revision History
Doc. Rev.
Date
Comments
5093C
1/2007
Implemented revision history
Remove PDIP package offering
Remove PB’d parts
15
5083C–SEEPR–1/07
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