PCA9600 Datasheet, PDF (12/30 Pages) NXP Semiconductors – Dual bidirectional bus buffer

NXP Semiconductors
PCA9600
Dual bidirectional bus buffer
10. Application information
Refer to PCA9600 data sheet and application notes AN10658 and AN255 for more
detailed application information.
5V
I²C-bus
SDA
V_CC (2.5 V to 15 V)
TX
(SDA)
RX
(SDA)
R1
'SDA' (new levels)
PCA9600
001aai063
Fig 11. Interfacing a standard 3 mA I²C-bus or one with TTL levels (e.g. SMBus) to
higher voltage or higher current sink (e.g. Fast-mode Plus) devices
V_CC
R2
V_CC1
R4
I²C-bus
SDA
5V
R1
RX R3
(SDA)
TX
(SDA)
PCA9600
R5
I²C-bus
SDA
001aai064
This simple example may be limited, if using lowest-cost couplers, to speeds as low as 5 kHz.
Refer to application notes for schematics suitable for operation to 400 kHz or higher.
Fig 12. Galvanic isolation of I²C-bus nodes via opto-couplers
PCA9600_4
Product data sheet
main enclosure
3.3 V to 5 V _{12 V}
SDA
3.3 V to 5 V
long cables
12 V
SCL
PCA9600
Fig 13. Long distance I²C-bus communication
Rev. 04 — 11 November 2009
remote control enclosure
12 V ^{3.3 V to 5 V}
SDA
3.3 V to 5 V
PCA9600
SCL
002aac846
© NXP B.V. 2009. All rights reserved.
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