topic Re: I2C PCA9601 and PCA9548A 8ch mux in Other NXP Products

I2C PCA9601 and PCA9548A 8ch mux

Henkk — Wed, 09 Aug 2023 13:37:19 GMT

The datasheet of the PCA9601 section 7.3 say: "Two or more SX or SY I/Os must not be interconnected. The PCA9601 design does not support this configuration. Bidirectional I2C-bus signals do not allow any direction control pin so, instead, slightly different logic LOW voltage levels are used at SX/SY to avoid latching of this buffer . . . . . . . ."

The question is: Is it possible to connect a PCA9548 8ch mux (SDA pin 23 and SCL pin 22 on TSSOP package) to the SX and SY pins of the PCA9601.

The PCA9548 is not a bus buffer, but has mosfets to connect a channel to the I2C bus.

Any help or clarification would be much appreciated

Re: I2C PCA9601 and PCA9548A 8ch mux

ErikaC — Wed, 09 Aug 2023 18:10:14 GMT

Hello,

Yes, you can connect PCA9548 SDA pin and SCL pin to the SX and SY pins of the PCA9601.

Hope this helps.

Re: I2C PCA9601 and PCA9548A 8ch mux

Henkk — Thu, 10 Aug 2023 08:22:42 GMT

Thanks for confirming

Re: I2C PCA9601 and PCA9548A 8ch mux

Henkk — Thu, 17 Aug 2023 09:32:03 GMT

Got a prototype working, I use the PCA9601 to connect I2C over RS422 and use Cat5e. I've tested it up to 266 meter (I didn't have more cable at the time)