NXP Semiconductors

PCA9601

Dual bidirectional bus buffer

PCA9601

I2C-bus

SDA

002aae877

5 V

R1

VCC

R2

R3

RX

(SDA)

TX

(SDA)

R5

R4

VCC1

I2C-bus

SDA

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.

Figure 13. Galvanic isolation of I2C-bus nodes via opto-couplers

PCA9601

SDA

SCL

002aae878

12 V

12 V

3.3 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

Figure 14. Long distance I2C-bus communication

PCA9601

SCL

RX

TX

002aae879

SX

VCC

TY

RY

SY

R2

R2

C2

C2

I2C-BUS

MASTER

SDA

VCC1

GND

R1 R1

BAT54A

cable

propagation

delay ≈ 5 ns/m

BAT54A

R1 R1

PCA9601

RX

TX

TY

RY

VCC

SX

SY

R2

R2

SCL

SDA

VCC2

GND

I2C-BUS

SLAVE(S)

C2

C2

+V cable drive

Figure 15. Driving ribbon or flat telephone cables

PCA9601

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2022. All rights reserved.

Product data sheet

Rev. 3.1 — 4 January 2022

12 / 31