AT24C08D 데이터 시트보기 (PDF) - Atmel Corporation
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AT24C08D Datasheet PDF : 28 Pages
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Figure 5-2. Page Write
SCL
12 3 4 567 89 12 345 67 89
SDA
Start
by
Master
Device Address Byte
Word Address Byte
1 0 1 0 A2 A9 A8 0 0 A7 A6 A5 A4 A3 A2 A1 A0 0
MSB
MSB
ACK
from
Slave
ACK
from
Slave
12 3 4 567 89 12 345 67 89
Data Word (n)
Data Word (n+x), max of 16 without rollover
D7 D6 D5 D4 D3 D2 D1 D0 0 D7 D6 D5 D4 D3 D2 D1 D0 0
MSB
MSB
ACK
from
Slave
ACK
from
Slave
Stop
by
Master
5.3 Acknowledge Polling
An Acknowledge Polling routine can be implemented to optimize time sensitive applications which would prefer not
to wait the fixed maximum write cycle time (tWR). This method allows the application to know immediately when the
Serial EEPROM write cycle has completed so a subsequent operation can be started.
Once the internally self-timed write cycle has started, an Acknowledge Polling routine can be initiated. This
involves repeatedly sending a Start condition followed by a valid Device Address byte with the R/W bit set at
Logic 0. The device will not respond with an ACK while the write cycle is ongoing. Once the internal write cycle has
completed, the EEPROM will respond with an ACK, allowing a new Read or Write operation to be immediately
initiated. A flow chart has been included below in Figure 5-3 to better illustrate this technique.
Figure 5-3. Acknowledge Polling Flow Chart
Send any
Write
protocol
Send
Stop
condition
to initiate the
write cycle
Send Start
condition followed
by a valid
Device Address
byte with R/W = 0
Did
the device
ACK?
YES
Proceed to
next Read or
Write operation
NO
5.4 Write Cycle Timing
The length of the self-timed write cycle or tWR is defined as the amount of time from the Stop condition that begins
the internal Write operation to the Start condition of the first Device Address byte sent to the AT24C08D which it
subsequently responds to with an ACK. Figure 5-4 has been included to show this measurement. During the
internally self-timed write cycle, any attempts to read from or write to the memory array will not be processed.
10 AT24C08D [DATASHEET]
Atmel-8880B-SEEPROM-AT24C08D-Datasheet_042014
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