24AA32-/P [MICROCHIP]
32K 1.8V I2C⑩ Smart Serial⑩ EEPROM; 32K 1.8V I2C⑩智能Serial⑩ EEPROM
| 型号： | 24AA32-/P |
| 厂家： | 
MICROCHIP |
| 描述： | 32K 1.8V I2C⑩ Smart Serial⑩ EEPROM |
| 文件： | 总14页 (文件大小：137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Obsolete Device
Please use 24AA32A or 24AA65.
24AA32
32K 1.8V I2C™ Smart Serial™ EEPROM
FEATURES
PDIP
• Voltage operating range: 1.8V to 6.0V
- Peak write current 3 mA at 6.0V
- Maximum read current 150 µA at 6.0V
- Standby current 1 µA typical
A0
A1
1
2
8
7
VCC
NC
• Industry standard two-wire bus protocol, I2C
compatible
A2
3
4
6
5
SCL
SDA
- Including 100 kHz (1.8V) and 400 kHz (5V)
modes
VSS
• Self-timed ERASE and WRITE cycles
• Power on/off data protection circuitry
• Endurance:
- 10,000,000 Erase/Write (E/W) cycles guaran-
teed for High Endurance Block
SOIC
1
2
8
7
A0
A1
VCC
- 1,000,000 E/W cycles guaranteed for
Standard Endurance Block
NC
• 8 byte page, or byte modes available
• 1 page x 8 line input cache (64 bytes) for fast write
loads
3
4
6
5
A2
SCL
SDA
• Schmitt trigger, filtered inputs for noise suppression
• Output slope control to eliminate ground bounce
• 2 ms typical write cycle time, byte or page
• Factory programming (QTP) available
• Up to 8 devices may be connected to the same
bus for up to 256K bits total memory
• Electrostatic discharge protection > 4000V
• Data retention > 200 years
VSS
BLOCK DIAGRAM
A0 A1 A2
HV GENERATOR
• 8-pin PDIP/SOIC packages
•
Temperature ranges
- Commercial (C):
0°C to +70°C
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
EEPROM
ARRAY
XDEC
DESCRIPTION
PAGE LATCHES
The Microchip Technology Inc. 24AA32 is a 4K x 8
(32K bit) Serial Electrically Erasable PROM capable of
operation across a broad voltage range (1.8V to 6.0V).
This device has been developed for advanced, low
power applications such as personal communications
or data acquisition. The 24AA32 features an input
cache for fast write loads with a capacity of eight 8-byte
pages, or 64 bytes. It also features a fixed 4K bit block
of ultra-high endurance memory for data that changes
frequently. The 24AA32 is capable of both random and
sequential reads up to the 32K boundary. Functional
address lines allow up to eight 24AA32 devices on the
same bus, for up to 256K bits address space.
I/O
SCL
CACHE
YDEC
SDA
VCC
VSS
SENSE AMP
R/W CONTROL
Advanced CMOS technology and broad voltage range
make this device ideal for low-power/low voltage, non-
volatile code PACKAGE TYPEsand data applications.
The 24AA32 is available in the standard 8-pin plastic
DIP and 8-pin surface mount SOIC package.
I2C is a trademark of Philips Corporation.
Smart Serial is a trademark of Microchip Technology Inc.
2004 Microchip Technology Inc.
DS21124E-page 1
24AA32
TABLE 1-1:
Name
PIN FUNCTION TABLE
Function
1.0
ELECTRICAL CHARACTERISTICS
1.1
Maximum Ratings*
A0,A1,A2
VSS
User Configurable Chip Selects
Ground
VCC ..................................................................................7.0V
All inputs and outputs w.r.t. VSS...............-0.6V to VCC +1.0V
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-65°C to +125°C
Soldering temperature of leads (10 seconds) .............+300°C
ESD protection on all pins..................................................≥ 4 kV
SDA
SCL
Serial Address/Data I/O
Serial Clock
VCC
+1.8V to 6.0V Power Supply
No Internal Connection
NC
*Notice: Stresses above those listed under “Maximum Ratings”
may cause permanent damage to the device. This is a stress rat-
ing 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 extended periods may affect device reliability.
TABLE 1-2:
DC CHARACTERISTICS
VCC = +1.8V to 6.0V
Commercial (C):
Industrial (I):
Tamb
Tamb
= 0°C to +70°C
= -40°C to +85°C
Parameter
Symbol
Min
Max
Units
Conditions
A0, A1, A2, SCL and SDA pins:
High level input voltage
VIH
VIL
.7 VCC
—
—
.3 Vcc
—
V
V
Low level input voltage
Hysteresis of Schmitt Trigger inputs
Low level output voltage
Input leakage current
VHYS
VOL
ILI
.05 VCC
—
V
(Note)
.40
10
V
IOL = 3.0 mA
-10
µA
µA
pF
VIN = .1V to VCC
VOUT = .1V to VCC
Output leakage current
ILO
-10
10
Pin capacitance
CIN,
—
10
VCC = 5.0V (Note)
(all inputs/outputs)
COUT
Tamb = 25°C, Fclk = 1 MHz
Operating current
ICC Write
ICC Read
—
—
3
150
mA
µA
VCC = 6.0V, SCL = 400 kHz
VCC = 6.0V, SCL = 400 kHz
Standby current
ICCS
—
5
2
µA
µA
VCC = 5.0V, SCL = SDA = VCC
A0, A1, A2 = VSS (Note)
VCC = 1.8V, SCL = SDA = VCC
A0, A1, A2 = VSS (Note)
Note: This parameter is periodically sampled and not 100% tested.
FIGURE 1-1: BUS TIMING START/STOP
VHYS
SCL
THD:STA
TSU:STA
TSU:STO
SDA
START
STOP
DS21124E-page 2
2004 Microchip Technology Inc.
24AA32
TABLE 1-3:
AC CHARACTERISTICS
VCC = 1.8V-6.0V VCC = 4.5 - 6.0V
STD. MODE FAST MODE
Parameter
Symbol
Units
Remarks
Min
Max
Min
Max
Clock frequency
FCLK
THIGH
TLOW
TR
—
4000
4700
—
100
—
—
600
1300
—
400
—
kHz
ns
Clock high time
Clock low time
—
—
ns
SDA and SCL rise time
SDA and SCL fall time
START condition hold time
1000
300
—
300
300
—
ns
(Note 1)
(Note1)
TF
—
—
ns
THD:STA
4000
600
ns
After this period the first
clock pulse is generated
START condition setup time
TSU:STA
4700
—
600
—
ns
Only relevant for repeated
START condition
Data input hold time
Data input setup time
STOP condition setup time
Output valid from clock
Bus free time
THD:DAT
TSU:DAT
TSU:STO
TAA
0
—
—
0
—
—
ns
ns
ns
ns
ns
250
4000
—
100
600
—
—
—
3500
—
900
—
(Note 2)
TBUF
4700
1300
Time the bus must be free
before a new transmission
can start
Output fall time from VIH min to
VIL max
TOF
TSP
—
—
—
250
50
5
20 +0.1
CB
250
50
5
ns
ns
(Note 1), CB ≤ 100 pF
Input filter spike suppression
(SDA and SCL pins)
—
(Note 3)
Write cycle time
TWR
—
ms/page (Note 4)
Endurance
High Endurance Block
Rest of Array
—
—
10M
1M
—
—
10M
1M
—
—
cycles 25°C, Vcc = 5.0V, Block
Cycle Mode (Note 5)
Note 1: Not 100% tested. CB = total capacitance of one bus line in pF.
2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions.
3: The combined TSP and VHYS specifications are due to new Schmitt trigger inputs which provide improved
noise and spike suppression. This eliminates the need for a Ti specification for standard operation.
4: The times shown are for a single page of 8 bytes. Multiply by the number of pages loaded into the write
cache for total time.
5: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific
application, please consult the Total Endurance Model which can be obtained on our website.
FIGURE 1-2: BUS TIMING DATA
TF
TR
THIGH
TLOW
SCL
TSU:STA
THD:DAT
TSU:DAT
TSU:STO
THD:STA
SDA
IN
TSP
TBUF
TAA
TAA
SDA
OUT
2004 Microchip Technology Inc.
DS21124E-page 3
24AA32
3.4
Data Valid (D)
2.0
FUNCTIONAL DESCRIPTION
The 24AA32 supports a bidirectional two-wire bus and
data transmission protocol. A device that sends data
onto the bus is defined as transmitter, and a device
receiving data as receiver. The bus must be controlled
by a master device which generates the serial clock
(SCL), controls the bus access, and generates the
START and STOP conditions, while the 24AA32 works
as slave. Both master and slave can operate as trans-
mitter or receiver but the master device determines
which mode is activated.
The state of the data line represents valid data when,
after a START condition, the data line is stable for the
duration of the HIGH period of the clock signal.
The data on the line must be changed during the LOW
period of the clock signal. There is one clock pulse per
bit of data.
Each data transfer is initiated with a START condition
and terminated with a STOP condition. The number of
the data bytes transferred between the START and
STOP conditions is determined by the master device.
3.0
BUS CHARACTERISTICS
3.5
Acknowledge
The following bus protocol has been defined:
• Data transfer may be initiated only when the bus
is not busy.
Each receiving device, when addressed, is obliged to
generate an acknowledge signal after the reception of
each byte. The master device must generate an extra
clock pulse which is associated with this acknowledge
bit.
• During data transfer, the data line must remain
stable whenever the clock line is HIGH. Changes
in the data line while the clock line is HIGH will be
interpreted as a START or STOP condition.
Note: The 24AA32 does not generate any
acknowledge bits if an internal program-
ming cycle is in progress.
Accordingly, the following bus conditions have been
defined (Figure 3-1).
A device that acknowledges must pull down the SDA
line during the acknowledge clock pulse in such a way
that the SDA line is stable LOW during the HIGH period
of the acknowledge related clock pulse. Of course,
setup and hold times must be taken into account. Dur-
ing reads, a master must signal an end of data to the
slave by NOT generating an acknowledge bit on the
last byte that has been clocked out of the slave. In this
case, the slave (24AA32) will leave the data line HIGH
to enable the master to generate the STOP condition.
3.1
Bus not Busy (A)
Both data and clock lines remain HIGH.
3.2
Start Data Transfer (B)
A HIGH to LOW transition of the SDA line while the
clock (SCL) is HIGH determines a START condition.
All commands must be preceded by a START condi-
tion.
3.3
Stop Data Transfer (C)
A LOW to HIGH transition of the SDA line while the
clock (SCL) is HIGH determines a STOP condition. All
operations must be ended with a STOP condition.
FIGURE 3-1: DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(A)
(B)
(D)
(D)
(C)
(A)
SCL
SDA
START
CONDITION
STOP
CONDITION
ADDRESS OR
ACKNOWLEDGE
VALID
DATA
ALLOWED
TO CHANGE
DS21124E-page 4
2004 Microchip Technology Inc.
24AA32
3.6
Device Addressing
FIGURE 3-2: CONTROL BYTE
ALLOCATION
A control byte is the first byte received following the
start condition from the master device. The control byte
consists of a four bit control code; for the 24AA32 this
is set as 1010 binary for read and write operations. The
next three bits of the control byte are the device select
bits (A2, A1, A0). They are used by the master device
to select which of the eight devices are to be accessed.
These bits are in effect the three most significant bits of
the word address. The last bit of the control byte
defines the operation to be performed. When set to a
one a read operation is selected, and when set to a
zero a write operation is selected. The next two bytes
received define the address of the first data byte
(Figure 3-3). Because only A11...A0 are used, the
upper four address bits must be zeros. The most signif-
icant bit of the most significant byte of the address is
transferred first.
START
READ/WRITE
SLAVE ADDRESS
R/W
A0
A
1
0
1
0
A2
A1
Control
Code
Operation
Device Select
R/W
Read
Write
1010
1010
Device Address
Device Address
1
0
Following the start condition, the 24AA32 monitors the
SDA bus checking the device type identifier being
transmitted. Upon receiving a 1010 code and appropri-
ate device select bits, the slave device outputs an
acknowledge signal on the SDA line. Depending on
the state of the R/W bit, the 24AA32 will select a read
or write operation.
FIGURE 3-3:
ADDRESS SEQUENCE BIT ASSIGNMENTS
ADDRESS BYTE 1
CONTROL BYTE
ADDRESS BYTE 0
A
2
A
1
A
0
A
11
A
10
A
9
A
8
A
•
A
0
•
•
•
•
•
1
0
1
0
R/W
0
0
0
0
7
SLAVE
ADDRESS
DEVICE
SELECT
BUS
2004 Microchip Technology Inc.
DS21124E-page 5
24AA32
The 24AA32 acknowledges again and the master gen-
erates a stop condition. This initiates the internal write
cycle, and during this time the 24AA32 will not generate
acknowledge signals (Figure 4-1).
4.0
WRITE OPERATION
4.1
Split Endurance
The 24AA32 is organized as a continuous 32K block of
memory. However, the first 4K, starting at address 000,
is rated at 10,000,000 E/W cycles guaranteed. The
remainder of the array, 28K bits, is rated at 100,000 E/
W cycles guaranteed. This feature is helpful in applica-
tions in which some data change frequently, while a
majority of the data change infrequently. One example
would be a cellular telephone in which last-number
redial and microcontroller scratch pad require a high-
endurance block, while speed dials and lookup tables
change infrequently and so require only a standard
endurance rating.
4.3
Page Write
The write control byte, word address and the first data
byte are transmitted to the 24AA32 in the same way as
in a byte write. But instead of generating a stop condi-
tion, the master transmits up to eight pages of eight
data bytes each (64 bytes total) which are temporarily
stored in the on-chip page cache of the 24AA32. They
will be written from cache into the EEPROM array after
the master has transmitted a stop condition. After the
receipt of each word, the six lower order address
pointer bits are internally incremented by one. The
higher order seven bits of the word address remain
constant. If the master should transmit more than eight
bytes prior to generating the stop condition (writing
across a page boundary), the address counter (lower
three bits) will roll over and the pointer will be incre-
mented to point to the next line in the cache. This can
continue to occur up to eight times or until the cache is
full, at which time a stop condition should be generated
by the master. If a stop condition is not received, the
cache pointer will roll over to the first line (byte 0) of the
cache, and any further data received will overwrite pre-
viously captured data. The stop condition can be sent
at any time during the transfer. As with the byte write
operation, once a stop condition is received, an internal
write cycle will begin. The 64-byte cache will continue
to capture data until a stop condition occurs or the oper-
ation is aborted (Figure 4-2).
4.2
Byte Write
Following the start condition from the master, the con-
trol code (four bits), the device select (three bits), and
the R/W bit which is a logic low are clocked onto the
bus by the master transmitter. This indicates to the
addressed slave receiver that a byte with a word
address will follow after it has generated an acknowl-
edge bit during the ninth clock cycle. Therefore the
next byte transmitted by the master is the high-order
byte of the word address and will be written into the
address pointer of the 24AA32. The next byte is the
least significant address byte. After receiving another
acknowledge signal from the 24AA32 the master
device will transmit the data word to be written into the
addressed memory location.
FIGURE 4-1: BYTE WRITE
S
T
S
BUS ACTIVITY
MASTER
Word
Address (0)
Word
Address (1)
A
R
T
T
CONTROL
BYTE
DATA
O
P
S
0 0 0 0
SDA LINE
P
A
C
K
A
C
K
A
C
K
A
C
K
BUS ACTIVITY
FIGURE 4-2: PAGE WRITE (FOR CACHE WRITE, SEE FIGURE 7-1)
S
S
T
O
P
T
BUS ACTIVITY
MASTER
A
R
T
CONTROL
BYTE
Word
Address (1)
Word
Address (2)
DATA n + 7
DATA n
0 0 0 0
P
S
SDA LINE
A
C
K
A
C
K
A
C
K
A
C
K
BUS ACTIVITY
DS21124E-page 6
2004 Microchip Technology Inc.
24AA32
5.0
ACKNOWLEDGE POLLING
6.0
READ OPERATION
Since the device will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (this feature can be used to maximize bus
throughput). Once the stop condition for a write com-
mand has been issued from the master, the device ini-
tiates the internally timed write cycle. ACK polling can
be initiated immediately. This involves the master send-
ing a start condition followed by the control byte for a
write command (R/W = 0). If the device is still busy with
the write cycle, then no ACK will be returned. If the
cycle is complete, then the device will return the ACK
and the master can then proceed with the next read or
write command. See Figure 5-1 for flow diagram.
Read operations are initiated in the same way as write
operations with the exception that the R/W bit of the
slave address is set to one. There are three basic
types of read operations: current address read, random
read, and sequential read.
6.1
Current Address Read
The 24AA32 contains an address counter that main-
tains the address of the last word accessed, internally
incremented by one. Therefore, if the previous access
(either a read or write operation) was to address n (n is
any legal address), the next current address read oper-
ation would access data from address n + 1. Upon
receipt of the slave address with R/W bit set to one, the
24AA32 issues an acknowledge and transmits the
eight bit data word. The master will not acknowledge
the transfer but does generate a stop condition and the
24AA32 discontinues transmission (Figure 6-1).
FIGURE 5-1: ACKNOWLEDGE POLLING
FLOW
Send
Write Command
6.2
Random Read
Send Stop
Condition to
Initiate Write Cycle
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
24AA32 as part of a write operation (R/W bit set to 0).
After the word address is sent, the master generates a
start condition following the acknowledge. This termi-
nates the write operation, but not before the internal
address pointer is set. Then the master issues the con-
trol byte again but with the R/W bit set to a one. The
24AA32 will then issue an acknowledge and transmit
the eight bit data word. The master will not acknowl-
edge the transfer but does generate a stop condition
which causes the 24AA32 to discontinue transmission
(Figure 6-2).
Send Start
Send Control Byte
with R/W = 0
Did Device
No
Acknowledge
(ACK = 0)?
Yes
Next
Operation
FIGURE 6-1: CURRENT ADDRESS READ
S
T
A
R
T
S
T
O
P
BUS ACTIVITY
MASTER
CONTROL BYTE
DATA BYTE
SDA LINE
S
P
A
C
K
N
O
BUS ACTIVITY
A
C
K
2004 Microchip Technology Inc.
DS21124E-page 7
24AA32
To provide sequential reads the 24AA32 contains an
internal address pointer which is incremented by one at
the completion of each operation. This address pointer
allows the entire memory contents to be serially read
during one operation. The address pointer, however,
will not roll over from address 07FF to address 0000. It
will roll from 07FF to unused memory space.
6.3
Contiguous Addressing Across
Multiple Devices
The device select bits A2, A1, A0 can be used to
expand the contiguous address space for up to 256K
bits by adding up to eight 24AA32's on the same bus.
In this case, software can use A0 of the control byte as
address bit A12, A1 as address bit A13, and A2 as
address bit A14.
6.5
Noise Protection
The SCL and SDA inputs have filter circuits which sup-
press noise spikes to ensure proper device operation
even on a noisy bus. All I/O lines incorporate Schmitt
triggers for 400 kHz (Fast Mode) compatibility.
6.4
Sequential Read
Sequential reads are initiated in the same way as a ran-
dom read except that after the 24AA32 transmits the
first data byte, the master issues an acknowledge as
opposed to the stop condition used in a random read.
This acknowledge directs the 24AA32 to transmit the
next sequentially addressed 8 bit word (Figure 6-3).
Following the final byte transmitted to the master, the
master will NOT generate an acknowledge but will gen-
erate a stop condition.
FIGURE 6-2: RANDOM READ
S
S
T
A
R
T
T
S
T
O
P
A
R
T
WORD
ADDRESS (1)
CONTROL
BYTE
WORD
ADDRESS (0)
CONTROL
BYTE
DATA n
S
0
0 0 0
SDA LINE
S
P
N
O
A
C
K
A
C
K
A
C
K
A
C
K
BUS
ACTIVITY:
A
C
K
FIGURE 6-3: SEQUENTIAL READ
S
T
O
P
BUS ACTIVITY
CONTROL
DATA n
DATA n + 1
DATA n + 2
DATA n + x
MASTER
BYTE
P
SDA LINE
A
C
K
A
C
K
A
C
K
A
C
K
N
O
BUS ACTIVITY
A
C
K
DS21124E-page 8
2004 Microchip Technology Inc.
24AA32
page 0 (of the cache). When the stop bit is sent, page
0 of the cache is written to page 3 of the array. The
remaining pages in the cache are then loaded sequen-
tially to the array. A write cycle is executed after each
page is written. If a partially loaded page in the cache
remains when the STOP bit is sent, only the bytes that
have been loaded will be written to the array.
6.6
PAGE CACHE AND ARRAY MAPPING
The cache is a 64 byte (8 pages x 8 bytes) FIFO buffer.
The cache allows the loading of up to 64 bytes of data
before the write cycle is actually begun, effectively pro-
viding a 64-byte burst write at the maximum bus rate.
Whenever a write command is initiated, the cache
starts loading and will continue to load until a stop bit is
received to start the internal write cycle. The total
length of the write cycle will depend on how many
pages are loaded into the cache before the stop bit is
given. Maximum cycle time for each page is 5 ms. Even
if a page is only partially loaded, it will still require the
same cycle time as a full page. If more than 64 bytes of
data are loaded before the stop bit is given, the address
pointer will 'wrap around' to the beginning of cache
page 0 and existing bytes in the cache will be overwrit-
ten. The device will not respond to any commands
while the write cycle is in progress.
6.9
Power Management
This design incorporates a power standby mode when
the device is not in use and automatically powers off
after the normal termination of any operation when a
stop bit is received and all internal functions are com-
plete. This includes any error conditions, ie. not receiv-
ing an acknowledge or stop condition per the two-wire
bus specification. The device also incorporates VDD
monitor circuitry to prevent inadvertent writes (data cor-
ruption) during low-voltage conditions. The VDD moni-
tor circuitry is powered off when the device is in standby
mode in order to further reduce power consumption.
6.7
Cache Write Starting at a Page
Boundary
7.0
PIN DESCRIPTIONS
If a write command begins at a page boundary
(address bits A2, A1 and A0 are zero), then all data
loaded into the cache will be written to the array in
sequential addresses. This includes writing across a
4K block boundary. In the example shown below,
(Figure 4-2) a write command is initiated starting at
byte 0 of page 3 with a fully loaded cache (64 bytes).
The first byte in the cache is written to byte 0 of page 3
(of the array), with the remaining pages in the cache
written to sequential pages in the array. A write cycle is
executed after each page is written. Since the write
begins at page 3 and 8 pages are loaded into the
cache, the last 3 pages of the cache are written to the
next row in the array.
7.1
A0, A1, A2 Chip Address Inputs
The A0..A2 inputs are used by the 24AA32 for multiple
device operation and conform to the two-wire bus stan-
dard. The levels applied to these pins define the
address block occupied by the device in the address
map. A particular device is selected by transmitting the
corresponding bits (A2, A1, A0) in the control byte
(Figure 3-3).
7.2
SDA Serial Address/Data Input/Output
This is a bidirectional pin used to transfer addresses
and data into and data out of the device. It is an open
drain terminal, therefore the SDA bus requires a pullup
resistor to VCC (typical 10KΩ for 100 kHz, 2 KΩ for 400
kHz)
6.8
Cache Write Starting at a Non-Page
Boundary
For normal data transfer SDA is allowed to change only
during SCL low. Changes during SCL high are
reserved for indicating the START and STOP condi-
tions.
When a write command is initiated that does not begin
at a page boundary (i.e., address bits A2, A1 and A0
are not all zero), it is important to note how the data is
loaded into the cache, and how the data in the cache is
written to the array. When a write command begins, the
first byte loaded into the cache is always loaded into
page 0. The byte within page 0 of the cache where the
load begins is determined by the three least significant
address bits (A2, A1, A0) that were sent as part of the
write command. If the write command does not start at
byte 0 of a page and the cache is fully loaded, then the
last byte(s) loaded into the cache will roll around to
page 0 of the cache and fill the remaining empty bytes.
If more than 64 bytes of data are loaded into the cache,
data already loaded will be overwritten. In the example
shown in Figure 7-2, a write command has been initi-
ated starting at byte 2 of page 3 in the array with a fully
loaded cache of 64 bytes. Since the cache started load-
ing at byte 2, the last two bytes loaded into the cache
will'roll over' and be loaded into the first two bytes of
7.3
SCL Serial Clock
This input is used to synchronize the data transfer from
and to the device.
2004 Microchip Technology Inc.
DS21124E-page 9
24AA32
FIGURE 7-1: CACHE WRITE TO THE ARRAY STARTING AT A PAGE BOUNDARY
1
Write command initiated at byte 0 of page 3 in the array;
First data byte is loaded into the cache byte 0.
2 64 bytes of data are loaded into cache.
cache page 0
cache cache
byte 0 byte 1
cache cache page 1 cache page 2
byte 7 bytes 8-15 bytes 16-23
cache page 7
bytes 56-63
• • •
• • •
3
Write from cache into array initiated by STOP bit.
Page 0 of cache written to page 3 of array.
4
Remaining pages in cache are written
to sequential pages in array.
Write cycle is executed after every page is written.
array row n
page 0 page 1 page 2 byte 0 byte 1
• • • byte 7 page 4 • • • page 7
array row n + 1
page 0 page 1 page 2
page 3 page 4 • • • page 7
5
Last page in cache written to page 2 in next row.
FIGURE 7-2: CACHE WRITE TO THE ARRAY STARTING AT A NON-PAGE BOUNDARY
1
Write command initiated; 64 bytes of data
loaded into cache starting at byte 2 of page 0.
2
Last 2 bytes loaded 'roll over'
to beginning.
3
Last 2 bytes
loaded into
cache cache cache
byte 0 byte 1 byte 2
cache cache page 1 cache page 2
byte 7 bytes 8-15 bytes 16-23
cache page 7
bytes 56-63
page 0 of cache.
• • •
• • •
4
Write from cache into array initiated by STOP bit.
Page 0 of cache written to page 3 of array.
5
Remaining bytes in cache are
written sequentially to array.
Write cycle is executed after every page is written.
array
page 0 page 1 page 2
page 0 page 1 page 2
• • •
page 4 • • • page 7
page 4 • • • page 7
byte 0 byte 1 byte 2 byte 3 byte 4
page 3
byte 7
row n
array
row
n + 1
6
Last 3 pages in cache written to next row in array.
DS21124E-page 10
2004 Microchip Technology Inc.
24AA32
24AA32 Product Identification System
To order or to obtain information, e.g., on pricing or delivery, please use the listed part numbers, and refer to the factory or the listed
sales offices.
24AA32
-
/P
P = Plastic DIP (300 mil Body), 8-lead
SM = Plastic SOIC (207 mil Body), 8-lead
Package:
Temperature
Range:
Blank = 0°C to +70°C
24AA32
24AA32T
16K I2C Serial EEPROM
Device:
16K I2C Serial EEPROM (Tape and Reel)
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (602) 786-7277
3. The Microchip Worldwide Web Site (www.microchip.com)
2004 Microchip Technology Inc.
DS21124E-page 11
24AA32
NOTES:
DS21124E-page 12
2004 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 intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical
components in life support systems is not authorized except
with express written approval by Microchip. No licenses are
conveyed, implicitly or otherwise, under any intellectual
property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, SEEVAL,
SmartSensor and The Embedded Control Solutions Company
are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Migratable Memory, MPASM,
MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net,
PICLAB, PICtail, PowerCal, PowerInfo, PowerMate,
PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial,
SmartTel and Total Endurance 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.
All other trademarks mentioned herein are property of their
respective companies.
© 2004, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro® 8-bit MCUs, 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.
2004 Microchip Technology Inc.
DS21124E-page 13
WORLDWIDE SALES AND SERVICE
China - Beijing
Singapore
AMERICAS
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: www.microchip.com
Unit 706B
200 Middle Road
Wan Tai Bei Hai Bldg.
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Tel: 86-10-85282100
Fax: 86-10-85282104
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850
Taiwan
Kaohsiung Branch
30F - 1 No. 8
Min Chuan 2nd Road
Kaohsiung 806, Taiwan
Tel: 886-7-536-4816
Fax: 886-7-536-4817
China - Chengdu
Rm. 2401-2402, 24th Floor,
Ming Xing Financial Tower
No. 88 TIDU Street
Chengdu 610016, China
Tel: 86-28-86766200
Atlanta
3780 Mansell Road, Suite 130
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Tel: 770-640-0034
Fax: 770-640-0307
Taiwan
Taiwan Branch
Fax: 86-28-86766599
Boston
11F-3, No. 207
China - Fuzhou
Unit 28F, World Trade Plaza
No. 71 Wusi Road
Fuzhou 350001, China
Tel: 86-591-7503506
Fax: 86-591-7503521
2 Lan Drive, Suite 120
Westford, MA 01886
Tel: 978-692-3848
Fax: 978-692-3821
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Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
Taiwan
Taiwan Branch
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Tel: 886-3-572-9526
Chicago
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Tel: 630-285-0071
Fax: 630-285-0075
China - Hong Kong SAR
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Dallas
EUROPE
Austria
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Tel: 43-7242-2244-399
Fax: 43-7242-2244-393
Denmark
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Tel: 45-4420-9895 Fax: 45-4420-9910
France
Parc d’Activite du Moulin de Massy
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91300 Massy, France
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
16200 Addison Road, Suite 255
Addison Plaza
China - Shanghai
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
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Addison, TX 75001
Tel: 972-818-7423
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Detroit
Tel: 86-21-6275-5700
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Tri-Atria Office Building
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Tel: 248-538-2250
China - Shenzhen
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No. 5022 Binhe Road, Futian District
Shenzhen 518033, China
Tel: 86-755-82901380
Fax: 86-755-8295-1393
China - Shunde
Fax: 248-538-2260
Kokomo
2767 S. Albright Road
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Tel: 765-864-8360
Fax: 765-864-8387
Room 401, Hongjian Building, No. 2
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District, Foshan City, Guangdong 528303, China
Tel: 86-757-28395507 Fax: 86-757-28395571
Los Angeles
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Tel: 949-462-9523
Germany
China - Qingdao
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No. 12 Hong Kong Central Rd.
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Tel: 86-532-5027355 Fax: 86-532-5027205
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Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Fax: 949-462-9608
San Jose
1300 Terra Bella Avenue
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Tel: 650-215-1444
Italy
India
Via Salvatore Quasimodo, 12
20025 Legnano (MI)
Milan, Italy
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-22290061 Fax: 91-80-22290062
Japan
Fax: 650-961-0286
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands
Waegenburghtplein 4
NL-5152 JR, Drunen, Netherlands
Tel: 31-416-690399
Toronto
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699
Yusen Shin Yokohama Building 10F
3-17-2, Shin Yokohama, Kohoku-ku,
Yokohama, Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Fax: 905-673-6509
Fax: 31-416-690340
ASIA/PACIFIC
Australia
Microchip Technology Australia Pty Ltd
Unit 32 41 Rawson Street
Epping 2121, NSW
Sydney, Australia
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
United Kingdom
505 Eskdale Road
Winnersh Triangle
Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Wokingham
Berkshire, England RG41 5TU
Tel: 44-118-921-5869
Fax: 44-118-921-5820
Tel: 82-2-554-7200 Fax: 82-2-558-5932 or
82-2-558-5934
07/12/04
2004 Microchip Technology Inc.
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