AT24C32A/64A Automotive - Mature

Features
• Standard-Voltage Operation
– 2.7 (VCC = 2.7V to 5.5V)
Internally Organized 4096 x 8 (32K), 8192 x 8 (64K)
Automotive Temperature Range –40C to +125C
Two-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
400 kHz Clock Rate
Write Protect Pin for Hardware Data Protection
32-byte Page Write Mode (Partial Page Writes Allowed)
Self-timed Write Cycle (5 ms Max)
High Reliability
– Endurance: 1 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
Serial EEPROM
32K (4096 x 8)
64K (8192 x 8)
Description
The AT24C32A/64A provides 32,768/65,536 bits of serial electrically erasable and
programmable read only memory (EEPROM) organized as 4096/8192 words of 8 bits
each. The device’s cascadable feature allows up to 8 devices to share a common twowire bus. The device is optimized for use in many automotive applications where low
power and low voltage operation are essential. The AT24C32A/64A is available in
space saving 8-lead JEDEC SOIC and 8-lead TSSOP packages and is accessed via
a 2-wire serial interface and is available in a 2.7V (2.7V to 5.5V) version.
Table 1. Pin Configuration
Pin Name
Function
A0 – A2
Address Inputs
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
1
2
3
4
1. AT24C32A not recommended for
new design; replaced by
AT24C32D Automotive.
2. AT24C64A not recommended for
new design; replaced by
AT24C64D Automotive.
8-lead SOIC
A0
A1
A2
GND
AT24C32A(1)
AT24C64A
VCC
WP
SCL
SDA
8
7
6
5
8-lead TSSOP
A0
A1
A2
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
5120D–SEEPR–6/08
Absolute Maximum Ratings*
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
*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.
DC Output Current........................................................ 5.0 mA
Figure 1. Block Diagram
2
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
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 (A2, A1, A0): The A2, A1 and A0 pins are device address inputs that are
hardwired or left not connected for hardware compatibility with other AT24Cxx devices. When
the pins are hardwired, as many as eight 32K/64K devices may be addressed on a single bus
system (device addressing is discussed in detail under the Device Addressing section). If the
pins are left floating, the A2, A1 and A0 pins will be internally pulled down to GND if the capacitive coupling to the circuit board VCC plane is <3 pF. If coupling is >3 pF, Atmel recommends
connecting the address pins to GND.
WRITE PROTECT (WP): The write protect input, when connected to GND, allows normal write
operations. When WP is connected high to VCC, all write operations to the memory are inhibited.
If the pin is left floating, the WP pin will be internally pulled down to GND if the capacitive coupling to the circuit board VCC plane is <3 pF. If coupling is >3 pF, Atmel recommends connecting
the pin to GND. Switching WP to VCC prior to a write operation creates a software write protect
function.
Memory
Organization
AT24C32A/64A, 32K/64K SERIAL EEPROM: The 32K/64K is internally organized as 128/256
pages of 32 bytes each. Random word addressing requires a 12/13-bit data word address.
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5120D–SEEPR–6/08
Table 2. Pin Capacitance(1)
Applicable over recommended operating range from TA = 25C, f = 1.0 MHz, VCC = +2.7V to +5.5V
Symbol
Test Condition
CI/O
Input/Output Capacitance (SDA)
CIN
Note:
Max
Units
Conditions
8
pF
VI/O = 0V
6
pF
VIN = 0V
Input Capacitance (A0, A1, A2, SCL)
1. 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
VCC3
Supply Voltage
ICC1
Supply Current
VCC = 5.0V
READ at 400 kHz
ICC2
Supply Current
VCC = 5.0V
WRITE at 400 kHz
ISB
Standby Current
ILI
Input Leakage
Current
ILO
Output Leakage
Current
(1)
VOL2
VOL1
Note:
4
Max
Units
Min
Typ
5.5
V
0.4
1.0
mA
2.0
3.0
mA
1.0
3.0
3.0
5.0
VIN = VCC or VSS
0.10
3.0
µA
VOUT = VCC or VSS
0.05
3.0
µA
2.7
VCC = 2.7V
VCC = 5.0V
VIL(1)
VIH
Test Condition
VIN = VCC or VSS
µA
Input Low Level
–0.6
VCC x 0.3
V
Input High Level
VCC x 0.7
VCC + 0.5
V
0.4
V
0.2
V
Output Low Level
VCC = 3.0V
IOL = 2.1 mA
Output Low Level
VCC = 1.8V
IOL = 0.15 mA
1. VIL min and VIH max are reference only and are not tested.
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
Table 4. AC Characteristics
Applicable over recommended operating range from TA = –40C to +125C, VCC = +2.7V to +5.5V, CL = 1 TTL Gate and
100 pF (unless otherwise noted)
AT24C32A/AT24C64A
2.7V – 5.5V
Symbol
Parameter
fSCL
Clock Frequency, SCL
tLOW
Clock Pulse Width Low
tHIGH
Clock Pulse Width High
Min
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(1)
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
(1)
50
ns
0.9
µs
Inputs Rise Time
0.3
µs
tF(1)
Inputs Fall Time
300
ns
tSU.STO
Stop Set-up Time
0.6
µs
tDH
Data Out Hold Time
50
ns
tWR
Write Cycle Time
tR
Endurance(1) 5.0V, 25C, Page Mode
Notes: 1. This parameter is ensured by characterization only.
5
1M
ms
Write Cycles
5
5120D–SEEPR–6/08
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 (refer to Data Validity timing diagram). Data changes during SCL high periods will indicate a start or stop condition
as defined below.
START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which
must precede any other command (see Figure 5 on page 8).
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 5 on page 8).
ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the
EEPROM in 8-bit words. The EEPROM sends a zero during the ninth clock cycle to acknowledge that it has received each word.
STANDBY MODE: The AT24C32A/64A features a low power standby mode which is enabled:
a) upon power-up and b) after the receipt of the stop bit and the completion of any internal
operations.
MEMORY RESET: After an interruption in protocol, power loss or system reset, any two-wire
part can be reset by following these steps:
(a) Clock up to 9 cycles, (b) look for SDA high in each cycle while SCL is high and then (c) create
a start condition as SDA is high.
6
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
Figure 2. Bus Timing
SCL: Serial Clock, SDA: Serial Data I/O
Figure 3. Write Cycle Timing
SCL: Serial Clock, SDA: Serial Data I/O
SCL
SDA
8th BIT
ACK
WORDn
(1)
twr
STOP
CONDITION
Note:
START
CONDITION
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.
Figure 4. Data Validity
7
5120D–SEEPR–6/08
Figure 5. Start and Stop Definition
Figure 6. Output Acknowledge
8
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
Device
Addressing
The 32K/64K EEPROM requires an 8-bit device address word following a start condition to
enable the chip for a read or write operation (see Figure 7 on page 11). The device address
word consists of a mandatory one, zero sequence for the first four most significant bits as
shown. This is common to all 2-wire EEPROM devices.
The 32K/64K uses the three device address bits A2, A1, A0 to allow as many as eight devices
on the same bus. These bits must compare to their corresponding hardwired input pins. The A2,
A1, and A0 pins use an internal proprietary circuit that biases them to a logic low condition if the
pins are allowed to float.
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 standby state.
NOISE PROTECTION: Special internal circuitry placed on the SDA and SCL pins prevent small
noise spikes from activating the device.
DATA SECURITY: The AT24C32A/64A has a hardware data protection scheme that allows the
user to write protect the entire memory when the WP pin is at VCC.
Write
Operations
BYTE WRITE: A write operation requires two 8-bit data word addresses following the device
address word and acknowledgment. Upon receipt of this address, the EEPROM will again
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 (see Figure 8 on page
11).
PAGE WRITE: The 32K/64K EEPROM is capable of 32-byte page writes.
A page write is initiated the same way 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 31 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 (see Figure 9 on page 11).
The data word address lower five 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 32 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 zero, allowing the read or write sequence to continue.
9
5120D–SEEPR–6/08
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 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 one 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 zero but does generate a following stop condition (see Figure 10 on
page 11).
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 zero but does generate a following stop condition (see Figure 11 on page 12).
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 microcontroller does not respond with a zero
but does generate a following stop condition (see Figure 12 on page 12).
10
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
Figure 7. Device Address
Figure 8. Byte Write
Figure 9. Page Write
Notes:
1. * = DON’T CARE bits
2. † = DON’T CARE bits for the 32K
Figure 10. Current Address Read
11
5120D–SEEPR–6/08
Figure 11. Random Read
Note:
1. * = DON’T CARE bits
Figure 12. Sequential Read
12
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
AT24C32A Ordering Information(1)
Ordering Code
Package
AT24C32AN-10SQ-2.7(2)(3)
AT24C32A-10TQ-2.7(2)(3)
8S1
8A2
Notes:
Operation Range
Lead-free/Halogen-free/
Automotive
(–40C to 125C)
1. For 2.7V devices used in the 4.5V to 5.5V range, please refer to performance values in the AC and DC Characteristics
tables.
2. “Q” designates Green package and RoHS Compliant.
3. AT24C32A not recommended for new design; replaced by AT24C32D Automotive.
Package Type
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8A2
8-lead, 4.4 mm Body, Plastic Thin Shrink Small Outline Package (TSSOP)
Options
–2.7
Low Voltage (2.7V to 5.5V)
13
5120D–SEEPR–6/08
AT24C64A Ordering Information(1)
Ordering Code
Package
AT24C64AN-10SQ-2.7(2)
AT24C64A-10TQ-2.7(2)
Notes:
8S1
8A2
Operation Range
Lead-free/Halogen-free/
Automotive
(–40C to 125C)
1. For 2.7V devices used in the 4.5V to 5.5V range, please refer to performance values in the AC and DC Characteristics
tables.
2. “Q” designates Green package and RoHS Compliant.
Package Type
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8A2
8-lead, 4.4mm Body, Plastic Thin Shrink Small Outline Package (TSSOP)
Options
–2.7
14
Low Voltage (2.7V to 5.5V)
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
Package Drawings
8S1 – JEDEC SOIC
C
1
E
E1
L
N
Ø
TOP VIEW
END VIEW
e
b
COMMON DIMENSIONS
(Unit of Measure = mm)
A
A1
D
SIDE VIEW
SYMBOL
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
–
5.05
E1
3.81
–
3.99
E
5.79
–
6.20
e
NOTE
1.27 BSC
L
0.40
–
1.27
θ
0˚
–
8˚
Note: These drawings are for general information only. Refer to JEDEC Drawing MS-012, Variation AA for proper dimensions, tolerances, datums, etc.
3/17/05
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.
REV.
8S1
C
15
5120D–SEEPR–6/08
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
16
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
AT24C32A/64A
5120D–SEEPR–6/08
AT24C32A/64A
Revision History
Revision History
Revision
Date
Comments
5120D
8/2013
AT24C64A not recommended for new design; replaced by AT24C64D Automotive.
5120D
8/2012
AT24C32A not recommended for new design; replaced by AT24C32D Automotive.
5120D
6/2008
Implemented revision history.
17
5120D–SEEPR–6/08
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5120D–SEEPR–6/08