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CAT24AC128PE-TE13 Datasheet(PDF) 6 Page - Catalyst Semiconductor

No. de pieza CAT24AC128PE-TE13
Descripción Electrónicos  128kbit I2C Serial CMOS EEPROM With Three Chip Address Input Pins
Download  11 Pages
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24AC128PE-TE13 Datasheet(HTML) 6 Page - Catalyst Semiconductor

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CAT24AC128
6
Doc. No. 1028, Rev. I
to send up to 63 additional bytes. After each byte has
been transmitted, CAT24AC128 will respond with an
acknowledge, and internally increment the six low order
address bits by one. The high order bits remain
unchanged.
If the Master transmits more than 64 bytes before sending
the STOP condition, the address counter ‘wraps around’,
and previously transmitted data will be overwritten.
When all 64 bytes are received, and the STOP condition
has been sent by the Master, the internal programming
cycle begins. At this point, all received data is written to
the CAT24AC128 in a single write cycle.
Acknowledge Polling
Disabling of the inputs 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,
CAT24AC128 initiates the internal write cycle. ACK
polling can be initiated immediately. This involves issu-
ing the start condition followed by the slave address for
a write operation. If CAT24AC128 is still busy with the
write operation, no ACK will be returned. If
CAT24AC128 has completed the write operation, an
ACK will be returned and the host can then proceed with
the next read or write operation.
WRITE PROTECTION
The Write Protection feature allows the user to protect
against inadvertent programming of the memory array.
If the WP pin is tied to VCC, the entire memory array is
protected and becomes read only. The CAT24AC128
will accept both slave and byte addresses, but the
memory location accessed is protected from
programming by the device’s failure to send an
acknowledge after the first byte of data is received.
READ OPERATIONS
The READ operation for the CAT24AC128 is initiated in
the same manner as the write operation with one
exception, that R/
W bit is set to one. Three different
READ operations are possible: Immediate/Current
Address READ, Selective/Random READ and
Sequential READ.
Immediate/Current Address Read
The CAT24AC128’s 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=E (where E=16383),
then the counter will ‘wrap around’ to address 0 and
continue to clock out data. After the CAT24AC128
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/Random Address Read
Selective/Random READ operations allow the Master
Figure 7. Page Write Timing
Figure 6. Byte Write Timing
A15–A8
SLAVE
ADDRESS
S
A
C
K
A
C
K
DATA
A
C
K
S
T
O
P
P
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
A7–A0
BYTE ADDRESS
A
C
K
*
*
A15–A8
SLAVE
ADDRESS
S
A
C
K
A
C
K
A
C
K
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
A7–A0
BYTE ADDRESS
DATA n+63
DATA
A
C
K
S
T
O
P
A
C
K
DATA n
A
C
K
P
A
C
K
*
*
*=Don't Care Bit
*=Don't Care Bit


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