Datasheet

PCA9600 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 5 — 5 May 2011 12 of 31
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.
Fig 11. Interfacing a standard 3 mA I
2
C-bus or one with TTL levels (e.g. SMBus) to
higher voltage or higher current sink (e.g. Fast-mode Plus) devices
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 I
2
C-bus nodes via opto-couplers
Fig 13. Long distance I
2
C-bus communication
PCA9600
I
2
C-bus
SDA
001aai06
3
5 V
V
CC
(2.5 V to 15 V)
R1
RX
(SDA)
TX
(SDA)
'SDA' (new levels)
PCA9600
I
2
C-bus
SDA
001aai06
4
5 V
R1
V
CC
R2
R3
RX
(SDA)
TX
(SDA)
R5
R4
V
CC1
I
2
C-bus
SDA
PCA9600
SDA
SCL
002aac84
6
12 V
12 V3.3 V to 5 V
3.3 V to 5 V
long cables
main enclosure
PCA9600
SDA
SCL
3.3 V to 5 V
3.3 V to 5 V
remote control enclosure
12 V