CAT1024(2004) Ver la hoja de datos (PDF) - Catalyst Semiconductor => Onsemi

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CAT1024
(Rev.:2004)

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

Catalyst Semiconductor => Onsemi 

CAT1024, CAT1025

ACKNOWLEDGE

After a successful data transfer, each receiving device

is required to generate an acknowledge. The

acknowledging device pulls down the SDA line during

the ninth clock cycle, signaling that it received the 8 bits

of data.

The CAT1024/25 responds with an acknowledge after

receiving a START condition and its slave address. If the

device has been selected along with a write operation,

it responds with an acknowledge after receiving each 8-

bit byte.

When the CAT1024/25 begins a READ mode it transmits

8 bits of data, releases the SDA line and monitors the

line for an acknowledge. Once it receives this

acknowledge, the CAT1024/25 will continue to transmit

data. If no acknowledge is sent by the Master, the device

terminates data transmission and waits for a STOP

condition.

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 a 8-bit

address that is to be written into the address pointers of

the device. After receiving another acknowledge from the

Slave, the Master device transmits the data to be written

into the addressed memory location. The CAT1024/25

acknowledges once more and the Master generates the

STOP condition. At this time, the device begins an

internal programming cycle to non-volatile memory. While

the cycle is in progress, the device will not respond to any

request from the Master device.

Figure 5. Start/Stop Timing

SDA

SCL

START BIT

STOP BIT

Figure 6. Acknowledge Timing

SCL FROM

1

MASTER

8

9

DATA OUTPUT

FROM TRANSMITTER

DATA OUTPUT

FROM RECEIVER

START

Figure 7. Slave Address Bits

ACKNOWLEDGE

Default CoCnAfTiguration

1

0

1

00

0

0 R/W

Doc. No. 3008, Rev. M

10

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