CAT34WC02YITE13A datasheet(6/10 Pages) CATALYST

No. de pieza	CAT34WC02YITE13A

Descripción Electrónicos	2-kb I2C Serial EEPROM, Serial Presence Detect

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Fabricante Electrónico	CATALYST [Catalyst Semiconductor]

Página de inicio	http://www.catalyst-semiconductor.com

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6 / 10 page

Discontinued

Part

CAT34WC02

6

Doc. No. 1003, Rev. O

Characteristics subject to change without notice

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

the byte address that is to be written into the address

pointer of the CAT34WC02. After receiving another

acknowledge from the Slave, the Master device trans-

mits the data byte to be written into the addressed

memory location. The CAT34WC02 acknowledges once

more and the Master generates the STOP condition, at

which time the device begins its internal programming to

nonvolatile memory. While this internal cycle is in

progress, the device will not respond to any request from

the Master device.

Page Write

The CAT34WC02 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 word is transmitted, the Master is allowed

to send up to 15 additional bytes. After each byte has

been transmitted the CAT34WC02 will respond with an

acknowledge, and internally increment the low order

address bits by one. The high order bits remain un-

changed.

If the Master transmits more than 16 bytes prior to

sending the STOP condition, the address counter ‘wraps

around’, and previously transmitted data will be overwrit-

ten.

Once 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 CAT34WC02 in a single write cycle.

Acknowledge Polling

The disabling of the inputs can be used to take advan-

tage of the typical write cycle time.

Once the stop

condition is issued to indicate the end of the host’s write

operation, the CAT34WC02 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 CAT34WC02 is still

busy with the write operation, no ACK will be returned.

If the CAT34WC02 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 CAT34WC02 is designed with a hardware protect

pin that enables the user to protect the entire memory.

The CAT34WC02 also has a software write protection

feature. By programming the software write protection

register, the first 128 bytes are write protected. The

software and hardware protection features of the

CAT34WC02 are designed into the part to provide

added flexibility to the design engineers.

Hardware

The write protection feature of CAT34WC02 allows the

user to protect against inadvertent programming of the

memory array. If the WP pin is tied to Vcc, the entire

5020 FHD F09

Figure 7. Page Write Timing

BYTE

ADDRESS

SLAVE

ADDRESS

S

A

C

K

A

C

K

DATA

A

C

K

S

T

O

P

BUS ACTIVITY:

MASTER

SDA LINE

S

T

A

R

T

5020 FHD F08

BUS ACTIVITY:

MASTER

SDA LINE

DATA n+P

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

NOTE: IN THIS EXAMPLE n = XXXX 0000(B); X = 1 or 0

*

Figure 6. Byte Write Timing

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