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PCA9501 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. PCA9501
Description  8-bit I2C and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCA9501 Datasheet(HTML) 5 Page - NXP Semiconductors

 
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Philips Semiconductors
Product data
PCA9501
8-bit I2C and SMBus I/O port with interrupt,
2-kbit EEPROM and 6 address pins
2003 Sep 12
5
FUNCTIONAL DESCRIPTION
SW00788
WRITE PULSE
DATA FROM
SHIFT REGISTER
POWER-ON
RESET
READ PULSE
DATA TO
SHIFT REGISTER
VDD
I/O0 TO I/O7
VSS
100
µA
CI
S
DQ
FF
CI
S
DQ
FF
TO INTERRUPT LOGIC
Figure 4. Simplified schematic diagram of each I/O
DEVICE ADDRESSING
Following a START condition the bus master must output the address of the slave it is accessing. The address of the PCA9501 is shown in
Figure 5. Internal pullup resistors are incorporated on the hardware selectable address pins.
0
A5
A4
A3
A2
A1
A0
A5
1A4
A3
A2
A1
A0
a.
b.
(a) I/O EXPANDER
(b) MEMORY
SW02006
SLAVE ADDRESS
SLAVE ADDRESS
HARDWARE
PROGRAMMABLE
FIXED
FIXED
R/W
R/W
HARDWARE
PROGRAMMABLE
Figure 5. PCA9501 slave addresses
The last bit of the address byte defines the operation to be performed. When set to logic 1 a read is selected while a logic 0 selects a write
operation.
CONTROL REGISTER
The PCA9501 contains a single 8-bit register called the Control Register, which can be written and read via the I2C bus. This register is sent
after a successful acknowledgment of the slave address.
It contains the I/O operation information.


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