Philips Semiconductors
PCF8598C-2
1024 × 8-bit CMOS EEPROM with I 2 C-bus interface
7. Device addressing
Table 5:
Device address code
Selection
Device code
Chip Enable
R/W
Bit
Device
b7 [1]
1
b6
0
b5
1
b4
0
b3
A2
b2
A1
b1
A0
b0
R/W
[1]
The Most Signi?cant Bit (MSB) ‘b7’ is sent ?rst.
A2 is the hardware selectable pin, A1 and A0 are software selectable pins.
A system could have up to two PCF8598C-2 devices on the same I 2 C-bus, equivalent
to a 16 kbit EEPROM, or 2 devices of 1024 bytes of memory, or 8 pages of 256 bytes
of memory.
A1 and A0 select a 256 byte page (one of the four pages available) on the selected
device. The device is selected by bit A2. Figure 3 shows the various address and
page combinations.
PCF8598C-2
I 2 C-BUS
DEVICE 1
256-BYTE PAGE 4
256-BYTE PAGE 3
256-BYTE PAGE 2
256-BYTE PAGE 1
A2
0
0
0
0
A1
1
1
0
0
A0
1
0
1
0
PCF8598C-2
DEVICE 2
256-BYTE PAGE 4
256-BYTE PAGE 3
256-BYTE PAGE 2
256-BYTE PAGE 1
1
1
1
1
1
1
0
0
1
0
1
0
002aaa256
Fig 3. Device addressing.
9397 750 14219
? Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data
Rev. 06 — 22 October 2004
5 of 21
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