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Philips Semiconductors
PCF8582C-2
256 × 8-bit CMOS EEPROM with I 2 C-bus interface
The master receiver must generate an acknowledge after the reception of each byte
that has been clocked out of the slave transmitter.
The device that acknowledges has to pull down the SDA line during the acknowledge
clock pulse in such a way that the SDA line is stable LOW during the HIGH period of
the acknowledge related clock pulse.
Set-up and hold times must be taken into account. A master receiver must signal an
end of data to the slave transmitter by not generating an acknowledge on the last byte
that has been clocked out of the slave. In this event, the transmitter must leave the
data line HIGH to enable the master generation of the STOP condition.
8.1.3
Device addressing
Following a START condition, the bus master must output the address of the slave it
is accessing. The address of the PCF8582C-2 is shown in Figure 4 . To conserve
power, no internal pull-up resistors are incorporated on the hardware selectable pins
and they must be connected to either V DD or V SS .
1
0
1
0
A2
A1
A0 R/W
FIXED
HARDWARE
SELECTABLE
002aaa173
Fig 4. Slave address.
The last bit of the slave address de?nes the operation to be performed. When set to
logic 1, a read operation is selected, while a logic 0 selects a write operation.
9397 750 14222
8.1.4
Write operations
Byte/word write: For a write operation, the PCF8582C-2 requires a second address
?eld. This address ?eld is a word address providing access to the 256 words of
memory. Upon receipt of the word address, the PCF8582C-2 responds with an
acknowledge and awaits the next eight bits of data, again responding with an
acknowledge. Word address is automatically incremented. The master can now
terminate the transfer by generating a STOP condition or transmit up to six more
bytes of data and then terminate 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 10 ms per byte.
During the E/W cycle the slave receiver does not send an acknowledge bit if
addressed via the I 2 C-bus.
? Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data
Rev. 04 — 25 October 2004
7 of 21
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