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PDF CAT24AA16 Data sheet ( Hoja de datos )
| Número de pieza | CAT24AA16 | |
| Descripción | 16-Kb I2C CMOS Serial EEPROM | |
| Fabricantes | ON Semiconductor | |
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CAT24AA16
16-Kb I2C CMOS Serial
EEPROM
Description
The CAT24AA16 is a 16−Kb CMOS Serial EEPROM device
internally organized as 2048x8 bits.
The device features a 16−byte page write buffer and supports
100 kHz, 400 kHz and 1 MHz I2C protocols.
Data is written by providing a starting address, then loading 1 to 16
contiguous bytes into a Page Write Buffer, and then writing all data to
non−volatile memory in one internal write cycle. Data is read by
providing a starting address and then shifting out data serially while
automatically incrementing the internal address count.
Features
• Standard and Fast I2C Protocol Compatible
• Supports 1 MHz Clock Frequency
• 1.7 V to 5.5 V Supply Voltage Range
• 16−Byte Page Write Buffer
• Hardware Write Protection for Entire Memory
• Schmitt Triggers and Noise Suppression Filters on I2C Bus Inputs
(SCL and SDA)
• Low Power CMOS Technology
• 1,000,000 Program/Erase Cycles
• 100 Year Data Retention
• Industrial Temperature Range
• This Device is Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
VCC
SCL
CAT24AA16
WP
SDA
VSS
Figure 1. Functional Symbol
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http://onsemi.com
SOIC−8
W SUFFIX
CASE 751BD
TSOT−23
TB SUFFIX
CASE 419AE
PIN CONFIGURATIONS
SOIC
NC 1 8 VCC
NC 2 7 WP
NC 3 6 SCL
VSS 4 5 SDA
(Top View)
SCL
VSS
SDA
TSOT−23
15
2
34
(Top View)
WP
VCC
Pin Name
SDA
SCL
WP
VCC
VSS
NC
PIN FUNCTION
Function
Serial Data Input/Output
Clock Input
Write Protect
Power Supply
Ground
No Connect
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
August, 2009 − Rev. 1
1
Publication Order Number:
CAT24AA16/D
1 page  
SCL FROM
MASTER
CAT24AA16
BUS RELEASE DELAY (TRANSMITTER)
18
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BUS RELEASE DELAY
(RECEIVER)
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACK DELAY (v tAA)
Figure 4. Acknowledge Timing
ACK SETUP (w tSU:DAT)
tF tHIGH tR
tLOW
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tSU:DAT
SDA IN
SDA OUT
tAA tDH
tSU:STO
tBUF
Figure 5. Bus Timing
WRITE OPERATIONS
Byte Write
To write data to memory, the Master creates a START
condition on the bus and then broadcasts a Slave address
with the R/W bit set to ‘0’. The Master then sends an address
byte and a data byte and concludes the session by creating
a STOP condition on the bus. The Slave responds with ACK
after every byte sent by the Master (Figure 6). The STOP
starts the internal Write cycle, and while this operation is in
progress (tWR), the SDA output is tri−stated and the Slave
does not acknowledge the Master (Figure 7).
Page Write
The Byte Write operation can be expanded to Page Write,
by sending more than one data byte to the Slave before
issuing the STOP condition (Figure 8). Up to 16 distinct data
bytes can be loaded into the internal Page Write Buffer
starting at the address provided by the Master. The page
address is latched, and as long as the Master keeps sending
data, the internal byte address is incremented up to the end
of page, where it then wraps around (within the page). New
data can therefore replace data loaded earlier. Following the
STOP, data loaded during the Page Write session will be
written to memory in a single internal Write cycle (tWR).
Acknowledge Polling
The acknowledge (ACK) polling routine can be used to
take advantage of the typical write cycle time. Once the stop
condition is issued to indicate the end of the host’s write
operation, the CAT24AA16 initiates the internal write cycle.
The ACK polling can be initiated immediately. This
involves issuing the start condition followed by the slave
address for a write operation. If the CAT24AA16 is still busy
with the write operation, NoACK will be returned. If the
CAT24AA16 device has completed the internal write
operation, an ACK will be returned and the host can then
proceed with the next read or write operation.
Hardware Write Protection
With the WP pin held HIGH, the entire memory is
protected against Write operations. If the WP pin is left
floating or is grounded, it has no impact on the Write
operation. The state of the WP pin is strobed on the last
falling edge of SCL immediately preceding the 1st data byte
(Figure 9). If the WP pin is HIGH during the strobe interval,
the Slave will not acknowledge the data byte and the Write
request will be rejected.
Delivery State
The CAT24AA16 is shipped erased, i.e., all bytes are FFh.
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