PCA9558 Просмотр технического описания (PDF) - Philips Electronics

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PCA9558

8-bit I2C and SMBus I/O port with 5-bit multiplexed/1-bit latched 6-bit I2C EEPROM and 2 k bit EEPROM

Philips Electronics 

Philips Semiconductors

8-bit I2C and SMBus I/O port with 5-bit multiplexed/1-bit

latched 6-bit I2C EEPROM and 2 k bit EEPROM

Product data

PCA9558

I2C INTERFACE

Communicating with this device is initiated by sending a valid address on the I2C bus. The address format (see FIgure 1) has 6 fixed bits and

one user-programmable bits followed by a 1-bit read/write value which determines the direction of the data transfer.

MSB

LSB

1

0

0

1

1

1

A0

R/W#

Figure 1. I2C Address Byte

SW00615

Following the address and acknowledge bit are 8 data bits which, depending on the read/write bit in the address, will read data from or write

data to the EEPROM. Data will be written to the register if the read/write bit is logic 0 and the WP input is logic 0. Data will be read from the

register if the bit is logic 1. The four high-order bits are latched outputs, while the four low order bits are multiplexed outputs (Figure 3).

NOTE:

1. To ensure data integrity, the EEPROM must be internally write protected when VCC to the I2C bus is powered down or VCC to the component

is dropped below normal operating levels.

MSB

0

MSB

0

2002 May 24

MSB

LSB

MSB LSB

0000 0001

0000 0011

0000 0100

0000 0110

0000 0111

0000 1000

0000 1001

0000 1010

0000 1011

0000 1100

0000 1101

0000 1110

0000 1111

0001 0000

0001 0001

0001 0010

0001 0011

to

1111 1111

Write to 256EE via I2C

Read from 256EE via I2C

Write to 6bitEE via I2C

Read from 6bitEE via I2C

Read IP (Input Port) Register via I2C

Read/Write OP (Output Port) Register via I2C

Read/Write PI (Polarity Inversion) Register via I2C

Read/Write IOC (Input/Output Configuration Register via I2C

Read/Write MUXCNTRL (Mux Control) Register via I2C

Read MUXIN values via I2C

Reserved

Reserved

Read 256EE and Write OP Register

Read 256EE and Write PI Register

Read 256EE and Write IOC Register

Read IP Register and Write to 256EE

Reserved

Reserved

Figure 2. Command Byte

0

Non_muxed

Data

Mux

Data E

Mux

Data D

Mux

Data C

Figure 3. I2C MUX_OUT Data Byte

SW00634

Mux

Data B

LSB

Mux

Data A

SW00456

LSB

0

0

MUX_IN E

MUX_IN D

MUX_IN C

MUX_IN B

MUX_IN A

Figure 4. I2C MUX_IN Data Byte

5

SW00528

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