CAT1021 datasheet(11/21 Pages) CATALYST

11 / 21 page

CAT1021, CAT1022, CAT1023

Doc. No. MD-3009 Rev. M

Characteristics subject to change without notice

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

Figure 9: Page Write Timing

BYTE

ADDRESS

SLAVE

ADDRESS

DATA

BUS ACTIVITY:

MASTER

SDA LINE

BUS ACTIVITY:

MASTER

SDA LINE

DATA n+15

BYTE

ADDRESS (n)

DATA n

DATA n+1

SLAVE

ADDRESS

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