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CAT24C256ZD2I-GT3 Scheda tecnica(PDF) 8 Page - ON Semiconductor

Il numero della parte CAT24C256ZD2I-GT3
Spiegazioni elettronici  256 kb I2C CMOS Serial EEPROM
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT24C256ZD2I-GT3 Scheda tecnica(HTML) 8 Page - ON Semiconductor

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CAT24C256
http://onsemi.com
8
READ OPERATIONS
Immediate Address Read
In standby mode, the CAT24C256 internal address
counter points to the data byte immediately following the
last byte accessed by a previous operation. If that ‘previous’
byte was the last byte in memory, then the address counter
will point to the 1st memory byte, etc.
When, following a START, the CAT24C256 is presented
with a Slave address containing a ‘1’ in the R/W bit position
(Figure 10), it will acknowledge (ACK) in the 9th clock cycle,
and will then transmit data being pointed at by the internal
address counter. The Master can stop further transmission by
issuing a NoACK, followed by a STOP condition.
Selective Read
The Read operation can also be started at an address
different from the one stored in the internal address counter.
The address counter can be initialized by performing a
‘dummy’ Write operation (Figure 11). Here the START is
followed by the Slave address (with the R/W bit set to ‘0’)
and the desired two byte address. Instead of following up
with data, the Master then issues a 2nd START, followed by
the ‘Immediate Address Read’ sequence, as described
earlier.
Sequential Read
If the Master acknowledges the 1st data byte transmitted
by the CAT24C256, then the device will continue
transmitting as long as each data byte is acknowledged by
the Master (Figure 12). If the end of memory is reached
during sequential Read, then the address counter will
‘wrap−around’ to the beginning of memory, etc. Sequential
Read works with either ‘Immediate Address Read’ or
‘Selective Read’, the only difference being the starting byte
address.
Figure 10. Immediate Address Read Timing
SCL
SDA
8th Bit
STOP
NO ACK
DATA OUT
89
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
Figure 11. Selective Read Timing
SLAVE
ADDRESS
S
A
C
K
A
C
K
A
C
K
S
T
A
R
T
SLAVE
S
A
C
K
S
T
A
R
T
P
S
T
O
P
BYTE ADDRESS
ADDRESS
N
O
A
C
K
DATA
BUS ACTIVITY:
MASTER
SDA LINE
*
A15 − A8
A7 − A0
* = Don’t Care Bit
Figure 12. Sequential Read Timing
S
T
O
P
P
SLAVE
ADDRESS
A
C
K
N
O
A
C
K
DATA n
BUS ACTIVITY:
MASTER
SDA LINE
A
C
K
DATA n+1
DATA n+2
A
C
K
A
C
K
DATA n+x


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