PCA8581P NXP Semiconductors, PCA8581P Datasheet - Page 8

• Manufacturer Part Number: PCA8581P
• Manufacturer: NXP Semiconductors

Specifications of PCA8581P

• Density: 1Kb
• Interface Type: Serial (I2C)
• Organization: 128x8
• Access Time (max): 3.4us
• Frequency (max): 100KHz
• Write Protection: No
• Data Retention: 10Year
• Operating Supply Voltage (typ): 5V
• Package Type: PDIP
• Operating Temp Range: -25C to 85C
• Supply Current: 1mA
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 8
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
To transmit eight bytes in sequential order, begin with the lowest address bits 0 0 0. The data is written after a stop is
detected. The data is only written if complete bytes have been received and acknowledged. Writing takes a time t
(6 to 10 ms) during which the device will not respond to its slave address. Note that to write the next row, a new write
operation is required (start, slave address, row address, data and stop).
An unlimited number of data bytes can be read in one operation. The address is automatically incremented. If a read
without setting the word address is performed after a write operation, the address pointer may point at a byte in the row
after the previously written row. This occurs if, during writing, the three lowest address bits (column) rolled over.
1997 Apr 02
handbook, full pagewidth
handbook, full pagewidth
128
S
SLAVE ADDRESS
8-bit EEPROM with I
Fig.9 Master reads after setting word address (WRITE word address; READ data).
acknowledgement
Fig.10 Master reads slave immediately after first byte (READ mode).
S
R/W
from slave
0 A
SLAVE ADDRESS
don't
care
X
WORD ADDRESS
acknowledgement
2
R/W
from slave
C-bus interface
acknowledgement
1 A
from slave
at this moment master -
transmitter becomes
master - receiver and
PCA8581(C) slave - receiver
becomes slave - transmitter
A
S
n bytes
DATA
8
SLAVE ADDRESS
acknowledgement
auto increment
word address
from slave
A
acknowledgement
R/W
from slave
1
last bytes
MLB891
A
DATA
PCA8581; PCA8581C
acknowledgement
auto increment
word address
n bytes
DATA
from slave
memory word address
MBD824
1
last byte
auto increment
acknowledgement
DATA
P
from master
memory word address
Product specification
no acknowledgement
auto increment
A
from master
1
P
WR