CAT1021(2004) Ver la hoja de datos (PDF) - Catalyst Semiconductor => Onsemi

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CAT1021
(Rev.:2004)

Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer

Catalyst Semiconductor => Onsemi 

CAT1021, CAT1022, CAT1023

Page Write

The CAT1021/22/23 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 CAT1021/22/23 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 CAT1021/22/23 in a single write cycle.

Figure 8. Byte Write Timing

S

T

BUS ACTIVITY: A

MASTER R

T

SDA LINE S

SLAVE

ADDRESS

BYTE

ADDRESS

S

T

DATA

O

P

P

A

A

A

C

C

C

K

K

K

Figure 9. Page Write Timing

S

T

BUS ACTIVITY: A

MASTER R

T

SDA LINE S

SLAVE

ADDRESS

BYTE

ADDRESS (n)

A

A

C

C

K

K

DATA n

DATA n+1

A

A

C

C

K

K

S

T

DATA n+15 O

P

P

A

C

K

11

Doc No. 3009, Rev. K

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