PCA9665D datasheet(67/91 Pages) PHILIPS

67 / 91 page

PCA9665_2

Product data sheet

Rev. 02 — 7 December 2006

67 of 91

NXP Semiconductors

PCA9665

Fm+ parallel bus to I2C-bus controller

10. Application design-in information

10.1 Speciﬁc applications

The PCA9665 is a parallel bus to I2C-bus controller that is designed to allow ‘smart’

devices to interface with I2C-bus or SMBus components, where the ‘smart’ device does

not have an integrated I2C-bus port and the designer does not want to ‘bit-bang’ the

I2C-bus port. The PCA9665 can also be used to add more I2C-bus 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

printed-circuit board.

10.2 Add I2C-bus port

As shown in Figure 33, the PCA9665 converts 8-bits of parallel data into a multiple master

capable I2C-bus port for microcontrollers, microprocessors, custom ASICs, DSPs, etc.,

that need to interface with I2C-bus or SMBus components.

Fig 32. Application diagram using the 80C51

002aab035

PCA9665

80C51

DECODER

D0 to D7

ALE

INT

SCL

SDA

RESET

SLAVE

INT

RESET

address bus

VDD

VSS

VDD

VSS

SLAVE

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