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CAT1162LI25G Arkusz danych(PDF) 8 Page - ON Semiconductor

Numer części CAT1162LI25G
Szczegółowy opis  Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
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CAT1162LI25G Arkusz danych(HTML) 8 Page - ON Semiconductor

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CAT1161, CAT1162
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8
WRITE OPERATIONS
Byte Write
In the Byte Write mode, the Master device sends the
START condition and the slave address information (with
the R/W bit set to zero) to the Slave device. After the Slave
generates an acknowledge, the Master sends a 8−bit address
that is to be written into the address pointers of the
CAT1161/2. After receiving another acknowledge from the
Slave, the Master device transmits the data to be written into
the addressed memory location. The CAT1161/2
acknowledges once more and the Master generates the
STOP condition. At this time, the device begins an internal
programming cycle to non−volatile memory. While the
cycle is in progress, the device will not respond to any
request from the Master device.
Page Write
The CAT1161/2 writes up to 16 bytes of data in a single
write cycle, using the Page Write operation. The page write
operation is initiated in the same manner as the byte write
operation, however instead of terminating after the initial
byte is transmitted, the Master is allowed to send up to 15
additional bytes. After each byte has been transmitted, the
CAT1161/2 will respond with an acknowledge and
internally increment the lower order address bits by one. The
high order bits remain unchanged.
If the Master transmits more than 16 bytes before sending
the STOP condition, the address counter ‘wraps around,’
and previously transmitted data will be overwritten.
When all 16 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
CAT1161/2 in a single write cycle.
Figure 7. Byte Write Timing
BYTE
ADDRESS
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
Figure 8. Page Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
DATA n+15
BYTE
ADDRESS (n)
A
C
K
A
C
K
DATA n
A
C
K
S
T
O
P
S
A
C
K
DATA n+1
A
C
K
S
T
A
R
T
P
SLAVE
ADDRESS
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, the
CAT1161/2 initiates the internal write cycle. ACK polling
can be initiated immediately. This involves issuing the start
condition followed by the slave address for a write
operation. If the CAT1161/2 is still busy with the write
operation, no ACK will be returned. If a write operation has
completed, 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 memory array programming. If the WP
pin is tied to VCC, the entire memory array is protected and
becomes read only. The CAT1161/2 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.


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