4 Replies Latest reply on Sep 15, 2016 7:36 AM by user_1377889

[SOLVED] CY8CMBR3106S - Getting No ACK

robbe.van.assche Sep 15, 2016 7:07 AM

Hey,

I have a PCB with the CY8CMBR3106S on. It's a low volume product (500-1k).

But, when i try to talk to the sensor via I2C, the sensor does not respond.

I understand it is in low power mode, but it never wakes up.

It has 1V8 on it's internal regulator and 3V3 on the VDD.

Seperate decoupling caps close to the VDD / CMOD.

Any solutions? I am searching almost 2 days already..
Would be a shame to not use this chip this far in my design process..

1. Re: [SOLVED] CY8CMBR3106S - Getting No ACK

user_1377889 Sep 14, 2016 7:28 AM (in response to robbe.van.assche)

I would suggest you to get in contact with Cypress directly: At top of this page select "Design support -> Create a Support Case" and ask your question. You will be helped by a Cypress engineer. You may provide them with schematics and/or layout, Cypress will keep those information confidential.

Bob
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2. Re: [SOLVED] CY8CMBR3106S - Getting No ACK

robbe.van.assche Sep 15, 2016 12:55 AM (in response to robbe.van.assche)

Thanks. I created a case. I will reply with the resolution for further reference.
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3. Re: [SOLVED] CY8CMBR3106S - Getting No ACK

robbe.van.assche Sep 15, 2016 7:06 AM (in response to robbe.van.assche)

I switched the SCL and SDA pins on my custom pcb. Stupid, but possible. Watch out for it.
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4. Re: [SOLVED] CY8CMBR3106S - Getting No ACK

user_1377889 Sep 15, 2016 7:36 AM (in response to robbe.van.assche)

When you have got two wires the probability to connect them wrong is exactly 50%

I can assure you that these 50% are used up to 100%   ;-)



Bob
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