PCA9601D datasheet(13/32 Pages) NXP

13 / 32 page

PCA9601

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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 I2C-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 I2C-bus nodes via opto-couplers

Fig 14. Long distance I2C-bus communication

PCA9601

I2C-bus

SDA

002aae876

5 V

VCC (2.5 V to 15 V)

(SDA)

'SDA' (new levels)

PCA9601

I2C-bus

SDA

002aae877

5 V

VCC

(SDA)

VCC1

I2C-bus

SDA

PCA9601

SDA

SCL

002aae878

12 V

3.3 V to 5 V

long cables

main enclosure

PCA9601

SDA

SCL

3.3 V to 5 V

remote control enclosure

12 V

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