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PCA9564BS

Parallel bus to I2C-bus controller

NXP Semiconductors. 

Philips Semiconductors

Parallel bus to I2C-bus controller

Product data sheet

PCA9564

SPECIFIC APPLICATIONS

The PCA9564 is a parallel bus to I2C bus controller that is designed

to allow “smart” devices to interface with I2C or SMBus components,

where the “smart” device does not have an integrated I2C port and

the designer does not want to “bit-bang” the I2C port. The PCA9564

can also be used to add more I2C ports to “smart” devices, provide a

higher frequency, lower voltage migration path for the PCF8584 and

convert 8 bits of parallel data to a serial bus to avoid running

multiple traces across the PC board.

ADD I2C-BUS PORT

As shown in Figure 14, the PCA9564 converts 8-bits of parallel data

into a multiple master capable I2C port for microcontrollers,

microprocessors, custom ASICs, DSPs, etc., that need to interface

with I2C or SMBus components.

MICROCONTROLLER,

MICROPROCESSOR,

OR ASIC

CONTROL SIGNALS

8-BITS

PCA9564

SDA

SCL

SW02108

Figure 14. Adding I2C-bus Port Application

ADD ADDITIONAL I2C-BUS PORTS

The PCA9564 can be used to convert 8-bit parallel data into

additional multiple master capable I2C port as shown in Figure 15. It

is used if the microcontroller, microprocessor, custom ASIC, DSP,

etc., already have an I2C port but need one or more additional I2C

ports to interface with more I2C or SMBus components or

components that cannot be located on the same bus (e.g., 100 kHz

and 400 kHz slaves on different buses so that each bus can operate

at its maximum potential).

PCA8584 MIGRATION PATH

The PCA9564 does the same type of parallel to serial conversion as

the PCF8584. Although not footprint or code compatible, the

PCA9564 provides improvements such as:

1. Operating at 3.3 V and 2.5 V voltage nodes with 5 V tolerant I/Os

2. Allows interface with I2C or SMBus components at speeds up to

400 kHz.

3. Built-in oscillator provides a cost effective solution since the

external clock input is no longer required.

4. Parallel data can be exchanged at speeds up to 50 MHz allowing

the use of faster processors.

SUPPLY VOLTAGE FREQUENCY

2.3 – 3.6 V

< 400 kHz

4.5 – 5.5 V

< 100 kHz

PCA9564

OSCILLATOR

PCF8584

SDA

SCL

SDA

SCL

CLOCK INPUT

SW02110

Figure 16. PCF8584 Migration Path

CONVERT 8 BITS OF PARALLEL DATA INTO

I2C-BUS SERIAL DATA STREAM

Functioning as a slave transmitter, the PCA9564 can convert 8-bit

parallel data into a two-wire I2C data stream as is shown in

Figure 17. This would prevent having to run 8 traces across the

entire width of the PC board.

SDA

SCL

MICROCONTROLLER,

MICROPROCESSOR,

OR ASIC

CONTROL SIGNALS

8-BITS

PCA9564

SDA

SCL

SW02109

Figure 15. Adding Additional I2C-bus Ports Application

MICROCONTROLLER,

MICROPROCESSOR,

OR ASIC

CONTROL

SIGNALS

8-BITS

PCA9564

SDA

SCL

MASTER

SW02111

Figure 17. Converting Parallel to Serial Data Application

2006 Sep 01

20

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