S524A40X11/40X21/40X41/60X81/60X51 SERIAL EEPROM

DATA SHEET

1-10

POLLING FOR AN ACK SIGNAL

When the master issues a stop condition to initiate a write cycle, the S524A40X11/40X21/40X41/60X81/60X51

starts an internal write cycle. The master can then immediately begin polling for an ACK from the slave device.

To poll for an ACK signal in a write operation, the master issues a start condition followed by the slave address.

As long as the S524A40X11/40X21/40X41/60X81/60X51 remains busy with the write operation, no ACK is

returned. When the S524A40X11/40X21/40X41/60X81/60X51 completes the write operation, it returns an ACK

and the master can then proceed with the next read or write operation (see Figure 1-11).

Send Write

Command

Send Stop Condition to

Initiate Write Cycle

Send Start

Condition

Send Slave Address

Start Next

Operation

ACK = "0" ?

Yes

No

Figure 1-11. Master Polling for an ACK Signal from a Slave Device