Application design-in information, 1 specific applications, 2 add i2c-bus port – NXP Semiconductors PCA9665 User Manual
Page 67: Pca9665, Nxp semiconductors, 2 add i, C-bus port
PCA9665_2
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 7 December 2006
67 of 91
NXP Semiconductors
PCA9665
Fm+ parallel bus to I
2
C-bus controller
10. Application design-in information
10.1 Specific applications
The PCA9665 is a parallel bus to I
2
C-bus controller that is designed to allow ‘smart’
devices to interface with I
2
C-bus or SMBus components, where the ‘smart’ device does
not have an integrated I
2
C-bus port and the designer does not want to ‘bit-bang’ the
I
2
C-bus port. The PCA9665 can also be used to add more I
2
C-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 I
2
C-bus port
As shown in
, the PCA9665 converts 8-bits of parallel data into a multiple master
capable I
2
C-bus port for microcontrollers, microprocessors, custom ASICs, DSPs, etc.,
that need to interface with I
2
C-bus or SMBus components.
Fig 32. Application diagram using the 80C51
002aab035
PCA9665
80C51
DECODER
D0 to D7
ALE
CE
RD
WR
INT
A0
SCL
SDA
A1
RESET
SLAVE
INT
RESET
address bus
V
DD
V
DD
8
V
SS
V
DD
V
DD
V
DD
V
SS
SLAVE