X24645SF Просмотр технического описания (PDF) - IC MICROSYSTEMS

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X24645SF

Advanced 2-Wire Serial E2PROM with Block Lock™ Protection

IC MICROSYSTEMS 

X24645

Sequential Read

Sequential reads can be initiated as either a current

address read or random access read. The first byte is

transmitted as with the other modes, however, the

master now responds with an acknowledge, indicating

it requires additional data. The X24645 continues to

output data for each acknowledge received. The read

operation is terminated by the master; by not responding

with an acknowledge and then issuing a

stop condition.

The data output is sequential, with the data from

address n followed by the data from n + 1. The address

counter for read operations increments all address bits,

allowing the entire memory contents to be serially read

during one operation. At the end of the address space

(address 8191), the counter “rolls over” to 0 and the

X24645 continues to output data for each acknowledge

received. Refer to Figure 9 for the address,

acknowledge and data transfer sequence.

Figure 9. Sequential Read

BUS ACTIVITY:

MASTER

SDA LINE

BUS ACTIVITY:

X24645

SLAVE

ADDRESS

A

A

A

C

C

C

K

K

K

A

C

K

DATA n

DATA n+1

DATA n+2

S

T

O

P

P

DATA n+x

2783 ILL F13

Figure 10. Typical System Configuration

SDA

SCL

MASTER

TRANSMITTER/

RECEIVER

SLAVE

RECEIVER

SLAVE

TRANSMITTER/

RECEIVER

MASTER

TRANSMITTER

MASTER

TRANSMITTER/

RECEIVER

V

CC

PULL-UP

RESISTORS

2783 ILL F14

8

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