PCF8594C-2T PHILIPS [NXP Semiconductors], PCF8594C-2T Datasheet - Page 5

• Manufacturer Part Number: PCF8594C-2T
• Description: 512 X 8-bit CMOS EEPROM with I2C-bus interface
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
7. Device addressing
9397 750 14221
Product data
Table 5:
[1]
A2 and A1 are hardware selectable pins and A0 is software selectable pin.
A system could have up to four PCF8594C-2 devices on the same I
equivalent to a 16 kbit EEPROM or 4 devices of 512 bytes of memory.
A0 selects the lower (logic level ‘0’) or the higher (logic level ‘1’) 256-byte page on the
selected device. The device is selected by bits A2 and A1.
address and page combinations.
Selection
Bit
Device
Fig 3. Device addressing.
The Most Significant Bit (MSB) ‘b7’ is sent first.
Device address code
b7
Rev. 05 — 25 October 2004
1
[1]
I
2
C-BUS
Device code
b6
0
512
PCF8594C-2
DEVICE 1
PCF8594C-2
DEVICE 2
PCF8594C-2
DEVICE 3
PCF8594C-2
DEVICE 4
HIGHER 256-BYTE PAGE
HIGHER 256-BYTE PAGE
HIGHER 256-BYTE PAGE
HIGHER 256-BYTE PAGE
LOWER 256-BYTE PAGE
LOWER 256-BYTE PAGE
LOWER 256-BYTE PAGE
LOWER 256-BYTE PAGE
b5
1
8-bit CMOS EEPROM with I
b4
0
002aaa260
A2
b3
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
A2
0
0
0
0
1
1
1
1
Chip Enable
Figure 3
PCF8594C-2
A1
0
0
1
1
0
0
1
1
A1
b2
A0
1
0
1
0
1
0
1
0
shows the various
2
2
C-bus,
C-bus interface
A0
b1
R/W
R/W
b0
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