topic How to driver PCA9541A/01? in Other NXP Products

How to driver PCA9541A/01?

kaka_zhuo — Mon, 11 Mar 2019 08:04:18 GMT

I use "PCA9541APW/01,118" as the I2C master selector.

Question: I can't change the channel from 0 to 1, how to drive it?

experiment:

1. after power on, the channel 0 works successful.

2. reading the control register(01h), the response value is 0x04.

3. sending command to let channel 0 give up the control, write 0x05 to 01h(control), the response value is correct.(0x05).

channel 0 is not working well, channel 1 can't work either.

use the OSC to capture the waveform, channel 1 send NACK for the slave address.

Could you kindly point out where is wrong? and give out the right process when need to exchange the channel.

Thanks!

kaka_zhuo — Wed, 13 Mar 2019 08:21:35 GMT

Find the root cause in the end. CH1's SCL and SDA trace are exchanged. So PCA9541A will not respond.

Thanks for your attention.

lisettelozano — Wed, 13 Mar 2019 17:47:28 GMT

Hello Kaka Zhuo,

Great to know that everything is working properly. In case that you present any further questions, please let me know.

Have a great day,

Paulina

kaka_zhuo — Thu, 14 Mar 2019 06:25:17 GMT

Thanks!