PCA9501 查看數據表（PDF） - Philips Electronics

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PCA9501

8-bit I2C and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins

Philips Electronics 

Philips Semiconductors

8-bit I2C and SMBus I/O port with interrupt,

2-kbit EEPROM and 6 address pins

Product data

PCA9501

FUNCTIONAL DESCRIPTION

WRITE PULSE

DATA FROM

SHIFT REGISTER

POWER-ON

RESET

DQ

FF

CI

S

100 µA

VDD

I/O0 TO I/O7

VSS

READ PULSE

DATA TO

SHIFT REGISTER

DQ

FF

CI

S

Figure 4. Simplified schematic diagram of each I/O

TO INTERRUPT LOGIC

SW00788

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.

SLAVE ADDRESS

SLAVE ADDRESS

0 A5 A4 A3 A2 A1 A0 R/W

1 A5 A4 A3 A2 A1 A0 R/W

(a) I/O EXPANDER

(b) MEMORY

FIXED

HARDWARE

PROGRAMMABLE

a.

FIXED

HARDWARE

PROGRAMMABLE

b.

Figure 5. PCA9501 slave addresses

SW02006

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.

2003 Sep 12

5

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