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CAT24FC02ZITE13REV-E Fiches technique(PDF) 7 Page - Catalyst Semiconductor

No de pièce CAT24FC02ZITE13REV-E
Description  The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
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Fabricant  CATALYST [Catalyst Semiconductor]
Site Internet  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24FC02ZITE13REV-E Fiches technique(HTML) 7 Page - Catalyst Semiconductor

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CAT24FC02
7
Doc No. 1072, Rev. G
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Read Operations
The READ operation for the CAT24FC02 is initiated in
the same manner as the write operation with the one
exception that the R/
W bit is set to a one. Three different
READ operations are possible: Immediate Address
READ, Selective READ and Sequential READ.
Immediate Address Read
The CAT24FC02 address counter contains the address
of the last byte accessed, incremented by one. In other
words, if the last READ or WRITE access was to address
N, the READ immediately following would access data
from address N + 1. If N = 255, the counter will ‘wrap
around’ to address 0 and continue to clock out data. After
the CAT24FC02 receives its slave address information
(with the R/
W bit set to one), it issues an acknowledge,
then transmits the 8-bit byte requested. The master
device does not send an acknowledge but will generate
a STOP condition.
Selective Read
Selective READ operations allow the Master device to
select at random any memory location for a READ
operation. The Master device first performs a ‘dummy’
write operation by sending the START condition, slave
address and byte address of the location it wishes to
read. After the CAT24FC02 acknowledge the word
address, the Master device resends the START condition
and the slave address, this time with the R/
W bit set to
one. The CAT24FC02 then responds with its
acknowledge and sends the 8-bit byte requested. The
master device does not send an acknowledge but will
generate a STOP condition.
Sequential Read
The Sequential READ operation can be initiated by
either the Immediate Address READ or Selective READ
operations. After the CAT24FC02 sends the initial 8-bit
data requested, the Master will respond with an
acknowledge which tells the device it requires more
data. The CAT24FC02 will continue to output a byte for
each acknowledge sent by the Master. The operation
will terminate operation when the Master fails to respond
with an acknowledge, thus sending the STOP condition.
The data being transmitted from the CAT24FC02 is
outputted sequentially with data from address N followed
by data from address N + 1. The READ operation
address counter increments all of the CAT24FC02
address bits so that the entire memory array can be read
during one operation. If more than the 256 bytes are read
out, the counter will “wrap around” and continue to clock
out data bytes.
Figure 8. Immediate Address Read Timing
SCL
SDA
8TH BI
89
T
STOP
NO ACK
DATA OUT
SLAVE
ADDRESS
S
A
C
K
DATA
N
O
A
C
K
S
T
O
P
P
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T


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