X9470 datasheet(21/25 Pages) XICOR

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REV 11.16 3/20/03

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Preliminary Information

X9470

Stop Condition

All communications must be terminated by a stop con-

dition, 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. See Figure 9.

Acknowledge

Acknowledge is a software convention used to indicate

successful data transfer. The transmitting device, either

master or slave, will release the bus after transmitting

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 10.

The device will respond with an acknowledge after rec-

ognition of a start condition and if the correct Device

Identiﬁer and Select bits are contained in the Slave

Address Byte. If a write operation is selected, the

device will respond with an acknowledge after the

receipt of each subsequent eight bit word. The device

will acknowledge all incoming data and address bytes,

except for:

– The Slave Address Byte when the Device Identiﬁer

and/or Select bits are incorrect

– The 2nd Data Byte of a Status Register Write Opera-

tion (only 1 data byte is allowed)

Figure 9. Valid Start and Stop Conditions

Figure 10. Acknowledge Response From Receiver

Figure 11. Valid Data Changes on the SDA Bus

SCL

SDA

Start

Stop

SCL from

Master

Data Output

from Transmitter

Data Output

from Receiver

Start

Acknowledge

SCL

SDA

Data Stable

Data Change

Data Stable

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