Datasheet

PCA9601 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 6 May 2011 13 of 32
NXP Semiconductors
PCA9601
Dual bidirectional bus buffer
10. Application information
Refer to application notes AN10658 and AN255 for more detailed application information.
Fig 12. 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 13. Galvanic isolation of I
2
C-bus nodes via opto-couplers
Fig 14. Long distance I
2
C-bus communication
PCA9601
I
2
C-bus
SDA
002aae87
6
5 V
V
CC
(2.5 V to 15 V)
R1
RX
(SDA)
TX
(SDA)
'SDA' (new levels)
PCA9601
I
2
C-bus
SDA
002aae87
7
5 V
R1
V
CC
R2
R3
RX
(SDA)
TX
(SDA)
R5
R4
V
CC1
I
2
C-bus
SDA
PCA9601
SDA
SCL
002aae87
8
12 V
12 V3.3 V to 5 V
3.3 V to 5 V
long cables
main enclosure
PCA9601
SDA
SCL
3.3 V to 5 V
3.3 V to 5 V
remote control enclosure
12 V