PCA9564(2003) Просмотр технического описания (PDF) - Philips Electronics
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PCA9564 Datasheet PDF : 31 Pages
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Philips Semiconductors
Parallel bus to I2C-bus controller
Product data
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).
SDA
SCL
MICROCONTROLLER,
MICROPROCESSOR,
OR ASIC
CONTROL SIGNALS
8-BITS
PCA9564
SDA
SCL
SW02109
Figure 15. Adding Additional I2C Bus Ports Application
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
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.
MICROCONTROLLER,
MICROPROCESSOR,
OR ASIC
CONTROL
SIGNALS
8-BITS
PCA9564
SDA
SCL
MASTER
SW02111
Figure 17. Converting Parallel to Serial Data Application
2003 Apr 02
20
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