se97pw/1 NXP Semiconductors, se97pw/1 Datasheet - Page 12

• Manufacturer Part Number: se97pw/1
• Description: Se97 Memory Module Temp Sensor With Integrated Spd
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SE97_2
Product data sheet
Fig 12. Byte Write timing
Fig 13. Page Write timing
SDA
SDA
7.10.1.1 Byte Write
7.10.1.2 Page Write
7.10.1 Write operations
START condition
S
START condition
S
1
1
slave address (memory)
slave address (memory)
0
0
In Byte Write mode the master creates a START condition and then broadcasts the slave
address, byte address, and data to be written. The slave acknowledges all 3 bytes by
pulling down the SDA line during the ninth clock cycle following each byte. The master
creates a STOP condition after the last ACK from the slave, which then starts the internal
write operation (see
request from the master.
The SE97 contains 256 bytes of data, arranged in 16 pages of 16 bytes each. The page is
selected by the four Most Significant Bits (MSB) of the address byte presented to the
device after the slave address, while the four Least Significant Bits (LSB) point to the byte
within the page. By loading more than one data byte into the device, up to an entire page
can be written in one write cycle (see
increment automatically after each data byte. If the master transmits more than
16 data bytes, then earlier bytes will be overwritten by later bytes in a wrap-around fashion
within the selected page. The internal write cycle is started following the STOP condition
created by the master.
1
1
0
0
A2 A1 A0
A2 A1 A0
R/W acknowledge
R/W acknowledge
0
0
A
from slave
A
from slave
Figure
Rev. 02 — 12 October 2007
12). During internal write, the slave will ignore any read/write
word address
word address
Memory module temp sensor with integrated SPD
Figure
acknowledge
acknowledge
from slave
from slave
13). The internal byte address counter will
A
A
write to the memory is performed
write to the memory is performed
data to memory
data to memory
DATA n
DATA n
DATA
data
15
acknowledge
acknowledge
acknowledge
STOP condition;
STOP condition;
from slave
from slave
from slave
© NXP B.V. 2007. All rights reserved.
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A
A
A
P
P
SE97
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