X24320PI datasheet(4/17 Pages) ICMIC

4 / 17 page

X24320

Figure 3. Acknowledge Response From Receiver

Stop Condition

All communications must be terminated by a stop

condition, which is a LOW to HIGH transition of SDA

when SCL is HIGH. The stop condition is also used to place

the device into the standby power mode after a

read sequence. A stop condition can only be issued after

the transmitting device has released the bus.

Acknowledge

Acknowledge is a software convention used to indicate

successful data transfer. The transmitting device,

either master or slave, will release the bus after trans- mitting

eight bits. During the ninth clock cycle the

receiver will pull the SDA line LOW to acknowledge that

it received the eight bits of data. Refer to Figure 3.

The device will respond with an acknowledge after

recognition of a start condition and its slave address. If

both the device and a write operation have been selected,

the device will respond with an acknowledge

after the receipt of each subsequent 8-bit word.

In the read mode the device will transmit eight bits of data,

release the SDA line and monitor the line for an

acknowledge. If an acknowledge is detected and no stop

condition is generated by the master, the device

will continue to transmit data. If an acknowledge is not

detected, the device will terminate further data trans-

missions. The master must then issue a stop condition

return the device to the standby power mode and

place the device into a known state

SCL FROM

MASTER

DATA OUTPUT

FROM

TRANSMITTER

DATA

OUTPUT

FROM

RECEIVER

START

ACKNOWLEDGE

7035 FM 05

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