參數(shù)資料
型號(hào)： 935233300112
廠商： NXP SEMICONDUCTORS
元件分類： PROM
英文描述： 2K X 8 I2C/2-WIRE SERIAL EEPROM, PDIP8
封裝： DIP-8
文件頁(yè)數(shù)： 21/23頁(yè)
文件大?。?/td> 185K
代理商： 935233300112
1997 Apr 02
7
Philips Semiconductors
Product specication
2048
× 8-bit CMOS EEPROM with I2C-bus
interface
PCF85116-3
8.3
Device addressing
Following a START condition the bus master must output
the address of the slave it is accessing. The 4 MSBs of the
slave address are the device type identifier (see Fig.3).
For the PCF85116-3 this is fixed to ‘1010’.
The next three significant bits of the slave address field are
the block selection bits. It is used by the host to select one
out of eight blocks (1 block = 256 bytes of memory). These
are, in effect, the three most significant bits of the word
address.
The last bit of the slave address defines the operation to
be performed. When R/W is set to logic 1 a read operation
is selected.
8.4
Write operations
8.4.1
BYTE/WORD WRITE
For a write operation the PCF85116-3 requires a second
address field. This address field is a word address
providing access to any one of the eight blocks of memory.
Upon receipt of the word address the PCF85116-3
responds with an acknowledge and awaits the next eight
bits of data, again responding with an acknowledge. Word
address is automatically incremented. The master
terminates the transfer by generating a STOP condition.
After this stop condition the E/W cycle starts and the bus
is free for another transmission. Its duration is maximum
10 ms.
During the E/W cycle the slave receiver does not send an
acknowledge bit if addressed via the I2C-bus.
Fig.3 Slave address.
handbook, halfpage
MBH924
101
0
B
R/W
8.4.2
PAGE WRITE
The PCF85116-3 is capable of an 32-byte page write
operation. It is initiated in the same manner as the byte
write operation. The master can transmit up to 32 data
bytes within one transmission. After receipt of each byte
the PCF85116-3 will respond with an acknowledge.
The master terminates the transfer by generating a STOP
condition. The maximum total E/W time in this mode is
10 ms.
After the receipt of each data byte the six high order bits of
the memory address providing access to one of the
64 pages of the memory remain unchanged. The five low
order bits of the memory address will be incremented only
(see Fig.3). By these five bits a single byte within the page
in access is selected. By an increment the memory
address may change from 31 to 0, from 63 to 32, etc. If the
master transmits more than 32 bytes prior to generating
the STOP condition, data within the addressed page may
be overwritten and unpredictable results may occur. As in
the byte write operation, all inputs are disabled until
completion of the internal write cycles.
8.4.3
REMARK
Write accesses to the EEPROM are enabled if the pin WP
is LOW. When WP is HIGH the EEPROM is
write-protected and no acknowledge will be given by the
PCF85116-3 when data is sent. However, an
acknowledge will be given after the slave address and the
word address.
Fig.4 Auto increment of memory address.
handbook, halfpage
MBH925
B
WORD ADDRESS
read: auto increment
write: unchanged
write: auto increment
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