CAT34RC02_05 datasheet(8/14 Pages) CATALYST

Part #	CAT34RC02

Description	2-kb I2C Serial EEPROM, Serial Presence Detect

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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8 / 14 page

Discontinued

Part

CAT34RC02

8

Doc. No. 1052, Rev. O

Characteristics subject to change without notice

Figure 10. Software Write Protect (Write)

Figure 9. Memory Array

* For PSWP A

0 is at normal CMOS levels and for RSWP, A0 is at VHV which must be held high beyond the end

of the STOP condition (approximately 1

µs of “overlap” is sufficient).

address counter can be ‘initialized’ by performing a

‘dummy’ WRITE operation (Fig. 12). The START

condition is followed by the Slave address (with the R/

W

bit set to ‘0’) and the desired byte address. Instead of

following up with data, the Master then issues a 2nd

START, followed by the ‘Immediate Address Read’

sequence, as described earlier.

Software Write Protectable

(by setting the write

protect flags)

FFH

00H

7FH

Hardware Write Protectable

(by connecting WP pin to

Vcc)

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

XXXXXXX

X = Don't Care

XX

Sequential Read

If the Master acknowledges the 1st data byte transmitted

by the CAT34RC02, then the device will continue

transmitting as long as each data byte is acknowledged

by the Master (Fig. 13). If the end of memory is reached

during sequential READ, the address counter will ‘wrap-

around’ to the beginning of memory, etc. Sequential

READ works with either ‘Immediate Address Read’ or

‘Selective Read’, the only difference being the starting

byte address.

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CAT34RC02 Datasheet(PDF) 8 Page - Catalyst Semiconductor

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